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java.lang
public final class: Class [javadoc | source]
java.lang.Object
   java.lang.Class

All Implemented Interfaces:
    java$lang$reflect$Type, AnnotatedElement, java$lang$reflect$GenericDeclaration, java$io$Serializable

Instances of the class {@code Class} represent classes and interfaces in a running Java application. An enum is a kind of class and an annotation is a kind of interface. Every array also belongs to a class that is reflected as a {@code Class} object that is shared by all arrays with the same element type and number of dimensions. The primitive Java types ({@code boolean}, {@code byte}, {@code char}, {@code short}, {@code int}, {@code long}, {@code float}, and {@code double}), and the keyword {@code void} are also represented as {@code Class} objects.

{@code Class} has no public constructor. Instead {@code Class} objects are constructed automatically by the Java Virtual Machine as classes are loaded and by calls to the {@code defineClass} method in the class loader.

The following example uses a {@code Class} object to print the class name of an object:

    void printClassName(Object obj) {
        System.out.println("The class of " + obj +
                           " is " + obj.getClass().getName());
    }

It is also possible to get the {@code Class} object for a named type (or for void) using a class literal. See Section 15.8.2 of The Java™ Language Specification. For example:

{@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
Nested Class Summary:
static class  Class.MethodArray   
Method from java.lang.Class Summary:
asSubclass,   cast,   desiredAssertionStatus,   enumConstantDirectory,   forName,   forName,   getAnnotation,   getAnnotationType,   getAnnotations,   getCanonicalName,   getClassLoader,   getClassLoader0,   getClasses,   getComponentType,   getConstantPool,   getConstructor,   getConstructors,   getDeclaredAnnotations,   getDeclaredClasses,   getDeclaredConstructor,   getDeclaredConstructors,   getDeclaredField,   getDeclaredFields,   getDeclaredMethod,   getDeclaredMethods,   getDeclaringClass,   getEnclosingClass,   getEnclosingConstructor,   getEnclosingMethod,   getEnumConstants,   getEnumConstantsShared,   getField,   getFields,   getGenericInterfaces,   getGenericSuperclass,   getInterfaces,   getMethod,   getMethods,   getModifiers,   getName,   getPackage,   getPrimitiveClass,   getProtectionDomain,   getResource,   getResourceAsStream,   getSigners,   getSimpleName,   getSuperclass,   getTypeParameters,   isAnnotation,   isAnnotationPresent,   isAnonymousClass,   isArray,   isAssignableFrom,   isEnum,   isInstance,   isInterface,   isLocalClass,   isMemberClass,   isPrimitive,   isSynthetic,   newInstance,   setAnnotationType,   setProtectionDomain0,   setSigners,   toString
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from java.lang.Class Detail:
 public Class<? extends U> asSubclass(Class<U> clazz) 
    Casts this {@code Class} object to represent a subclass of the class represented by the specified class object. Checks that that the cast is valid, and throws a {@code ClassCastException} if it is not. If this method succeeds, it always returns a reference to this class object.

    This method is useful when a client needs to "narrow" the type of a {@code Class} object to pass it to an API that restricts the {@code Class} objects that it is willing to accept. A cast would generate a compile-time warning, as the correctness of the cast could not be checked at runtime (because generic types are implemented by erasure).

 public T cast(Object obj) 
    Casts an object to the class or interface represented by this {@code Class} object.
 public boolean desiredAssertionStatus() 
    Returns the assertion status that would be assigned to this class if it were to be initialized at the time this method is invoked. If this class has had its assertion status set, the most recent setting will be returned; otherwise, if any package default assertion status pertains to this class, the most recent setting for the most specific pertinent package default assertion status is returned; otherwise, if this class is not a system class (i.e., it has a class loader) its class loader's default assertion status is returned; otherwise, the system class default assertion status is returned.

    Few programmers will have any need for this method; it is provided for the benefit of the JRE itself. (It allows a class to determine at the time that it is initialized whether assertions should be enabled.) Note that this method is not guaranteed to return the actual assertion status that was (or will be) associated with the specified class when it was (or will be) initialized.

 Map<String, T> enumConstantDirectory() 
    Returns a map from simple name to enum constant. This package-private method is used internally by Enum to implement public static > T valueOf(Class, String) efficiently. Note that the map is returned by this method is created lazily on first use. Typically it won't ever get created.
 public static Class<?> forName(String className) throws ClassNotFoundException 
    Returns the {@code Class} object associated with the class or interface with the given string name. Invoking this method is equivalent to:
    {@code Class.forName(className, true, currentLoader)}
    where {@code currentLoader} denotes the defining class loader of the current class.

    For example, the following code fragment returns the runtime {@code Class} descriptor for the class named {@code java.lang.Thread}:

    {@code Class t = Class.forName("java.lang.Thread")}

    A call to {@code forName("X")} causes the class named {@code X} to be initialized.

 public static Class<?> forName(String name,
    boolean initialize,
    ClassLoader loader) throws ClassNotFoundException 
    Returns the {@code Class} object associated with the class or interface with the given string name, using the given class loader. Given the fully qualified name for a class or interface (in the same format returned by {@code getName}) this method attempts to locate, load, and link the class or interface. The specified class loader is used to load the class or interface. If the parameter {@code loader} is null, the class is loaded through the bootstrap class loader. The class is initialized only if the {@code initialize} parameter is {@code true} and if it has not been initialized earlier.

    If {@code name} denotes a primitive type or void, an attempt will be made to locate a user-defined class in the unnamed package whose name is {@code name}. Therefore, this method cannot be used to obtain any of the {@code Class} objects representing primitive types or void.

    If {@code name} denotes an array class, the component type of the array class is loaded but not initialized.

    For example, in an instance method the expression:

    {@code Class.forName("Foo")}
    is equivalent to:
    {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
    Note that this method throws errors related to loading, linking or initializing as specified in Sections 12.2, 12.3 and 12.4 of The Java Language Specification. Note that this method does not check whether the requested class is accessible to its caller.

    If the {@code loader} is {@code null}, and a security manager is present, and the caller's class loader is not null, then this method calls the security manager's {@code checkPermission} method with a {@code RuntimePermission("getClassLoader")} permission to ensure it's ok to access the bootstrap class loader.

 public A getAnnotation(Class<A> annotationClass) 
 AnnotationType getAnnotationType() 
 public Annotation[] getAnnotations() 
 public String getCanonicalName() 
    Returns the canonical name of the underlying class as defined by the Java Language Specification. Returns null if the underlying class does not have a canonical name (i.e., if it is a local or anonymous class or an array whose component type does not have a canonical name).
 public ClassLoader getClassLoader() 
    Returns the class loader for the class. Some implementations may use null to represent the bootstrap class loader. This method will return null in such implementations if this class was loaded by the bootstrap class loader.

    If a security manager is present, and the caller's class loader is not null and the caller's class loader is not the same as or an ancestor of the class loader for the class whose class loader is requested, then this method calls the security manager's {@code checkPermission} method with a {@code RuntimePermission("getClassLoader")} permission to ensure it's ok to access the class loader for the class.

    If this object represents a primitive type or void, null is returned.

 native ClassLoader getClassLoader0()
 public Class<?>[] getClasses() 
    Returns an array containing {@code Class} objects representing all the public classes and interfaces that are members of the class represented by this {@code Class} object. This includes public class and interface members inherited from superclasses and public class and interface members declared by the class. This method returns an array of length 0 if this {@code Class} object has no public member classes or interfaces. This method also returns an array of length 0 if this {@code Class} object represents a primitive type, an array class, or void.
 public native Class<?> getComponentType()
    Returns the {@code Class} representing the component type of an array. If this class does not represent an array class this method returns null.
 native ConstantPool getConstantPool()
 public Constructor<T> getConstructor(Class<?> parameterTypes) throws NoSuchMethodException, SecurityException 
    Returns a {@code Constructor} object that reflects the specified public constructor of the class represented by this {@code Class} object. The {@code parameterTypes} parameter is an array of {@code Class} objects that identify the constructor's formal parameter types, in declared order. If this {@code Class} object represents an inner class declared in a non-static context, the formal parameter types include the explicit enclosing instance as the first parameter.

    The constructor to reflect is the public constructor of the class represented by this {@code Class} object whose formal parameter types match those specified by {@code parameterTypes}.

 public Constructor<?>[] getConstructors() throws SecurityException 
    Returns an array containing {@code Constructor} objects reflecting all the public constructors of the class represented by this {@code Class} object. An array of length 0 is returned if the class has no public constructors, or if the class is an array class, or if the class reflects a primitive type or void. Note that while this method returns an array of {@code Constructor} objects (that is an array of constructors from this class), the return type of this method is {@code Constructor[]} and not {@code Constructor[]} as might be expected. This less informative return type is necessary since after being returned from this method, the array could be modified to hold {@code Constructor} objects for different classes, which would violate the type guarantees of {@code Constructor[]}.
 public Annotation[] getDeclaredAnnotations() 
 public Class<?>[] getDeclaredClasses() throws SecurityException 
    Returns an array of {@code Class} objects reflecting all the classes and interfaces declared as members of the class represented by this {@code Class} object. This includes public, protected, default (package) access, and private classes and interfaces declared by the class, but excludes inherited classes and interfaces. This method returns an array of length 0 if the class declares no classes or interfaces as members, or if this {@code Class} object represents a primitive type, an array class, or void.
 public Constructor<T> getDeclaredConstructor(Class<?> parameterTypes) throws NoSuchMethodException, SecurityException 
    Returns a {@code Constructor} object that reflects the specified constructor of the class or interface represented by this {@code Class} object. The {@code parameterTypes} parameter is an array of {@code Class} objects that identify the constructor's formal parameter types, in declared order. If this {@code Class} object represents an inner class declared in a non-static context, the formal parameter types include the explicit enclosing instance as the first parameter.
 public Constructor<?>[] getDeclaredConstructors() throws SecurityException 
    Returns an array of {@code Constructor} objects reflecting all the constructors declared by the class represented by this {@code Class} object. These are public, protected, default (package) access, and private constructors. The elements in the array returned are not sorted and are not in any particular order. If the class has a default constructor, it is included in the returned array. This method returns an array of length 0 if this {@code Class} object represents an interface, a primitive type, an array class, or void.

    See The Java Language Specification, section 8.2.

 public Field getDeclaredField(String name) throws NoSuchFieldException, SecurityException 
    Returns a {@code Field} object that reflects the specified declared field of the class or interface represented by this {@code Class} object. The {@code name} parameter is a {@code String} that specifies the simple name of the desired field. Note that this method will not reflect the {@code length} field of an array class.
 public Field[] getDeclaredFields() throws SecurityException 
    Returns an array of {@code Field} objects reflecting all the fields declared by the class or interface represented by this {@code Class} object. This includes public, protected, default (package) access, and private fields, but excludes inherited fields. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if the class or interface declares no fields, or if this {@code Class} object represents a primitive type, an array class, or void.

    See The Java Language Specification, sections 8.2 and 8.3.

 public Method getDeclaredMethod(String name,
    Class<?> parameterTypes) throws NoSuchMethodException, SecurityException 
    Returns a {@code Method} object that reflects the specified declared method of the class or interface represented by this {@code Class} object. The {@code name} parameter is a {@code String} that specifies the simple name of the desired method, and the {@code parameterTypes} parameter is an array of {@code Class} objects that identify the method's formal parameter types, in declared order. If more than one method with the same parameter types is declared in a class, and one of these methods has a return type that is more specific than any of the others, that method is returned; otherwise one of the methods is chosen arbitrarily. If the name is "<init>"or "<clinit>" a {@code NoSuchMethodException} is raised.
 public Method[] getDeclaredMethods() throws SecurityException 
    Returns an array of {@code Method} objects reflecting all the methods declared by the class or interface represented by this {@code Class} object. This includes public, protected, default (package) access, and private methods, but excludes inherited methods. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if the class or interface declares no methods, or if this {@code Class} object represents a primitive type, an array class, or void. The class initialization method {@code } is not included in the returned array. If the class declares multiple public member methods with the same parameter types, they are all included in the returned array.

    See The Java Language Specification, section 8.2.

 public native Class<?> getDeclaringClass()
    If the class or interface represented by this {@code Class} object is a member of another class, returns the {@code Class} object representing the class in which it was declared. This method returns null if this class or interface is not a member of any other class. If this {@code Class} object represents an array class, a primitive type, or void,then this method returns null.
 public Class<?> getEnclosingClass() 
    Returns the immediately enclosing class of the underlying class. If the underlying class is a top level class this method returns {@code null}.
 public Constructor<?> getEnclosingConstructor() 
    If this {@code Class} object represents a local or anonymous class within a constructor, returns a Constructor object representing the immediately enclosing constructor of the underlying class. Returns {@code null} otherwise. In particular, this method returns {@code null} if the underlying class is a local or anonymous class immediately enclosed by a type declaration, instance initializer or static initializer.
 public Method getEnclosingMethod() 
    If this {@code Class} object represents a local or anonymous class within a method, returns a Method object representing the immediately enclosing method of the underlying class. Returns {@code null} otherwise. In particular, this method returns {@code null} if the underlying class is a local or anonymous class immediately enclosed by a type declaration, instance initializer or static initializer.
 public T[] getEnumConstants() 
    Returns the elements of this enum class or null if this Class object does not represent an enum type.
 T[] getEnumConstantsShared() 
    Returns the elements of this enum class or null if this Class object does not represent an enum type; identical to getEnumConstants except that the result is uncloned, cached, and shared by all callers.
 public Field getField(String name) throws NoSuchFieldException, SecurityException 
    Returns a {@code Field} object that reflects the specified public member field of the class or interface represented by this {@code Class} object. The {@code name} parameter is a {@code String} specifying the simple name of the desired field.

    The field to be reflected is determined by the algorithm that follows. Let C be the class represented by this object:

    1. If C declares a public field with the name specified, that is the field to be reflected.
    2. If no field was found in step 1 above, this algorithm is applied recursively to each direct superinterface of C. The direct superinterfaces are searched in the order they were declared.
    3. If no field was found in steps 1 and 2 above, and C has a superclass S, then this algorithm is invoked recursively upon S. If C has no superclass, then a {@code NoSuchFieldException} is thrown.

    See The Java Language Specification, sections 8.2 and 8.3.

 public Field[] getFields() throws SecurityException 
    Returns an array containing {@code Field} objects reflecting all the accessible public fields of the class or interface represented by this {@code Class} object. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if the class or interface has no accessible public fields, or if it represents an array class, a primitive type, or void.

    Specifically, if this {@code Class} object represents a class, this method returns the public fields of this class and of all its superclasses. If this {@code Class} object represents an interface, this method returns the fields of this interface and of all its superinterfaces.

    The implicit length field for array class is not reflected by this method. User code should use the methods of class {@code Array} to manipulate arrays.

    See The Java Language Specification, sections 8.2 and 8.3.

 public Type[] getGenericInterfaces() 
    Returns the {@code Type}s representing the interfaces directly implemented by the class or interface represented by this object.

    If a superinterface is a parameterized type, the {@code Type} object returned for it must accurately reflect the actual type parameters used in the source code. The parameterized type representing each superinterface is created if it had not been created before. See the declaration of ParameterizedType for the semantics of the creation process for parameterized types.

    If this object represents a class, the return value is an array containing objects representing all interfaces implemented by the class. The order of the interface objects in the array corresponds to the order of the interface names in the {@code implements} clause of the declaration of the class represented by this object. In the case of an array class, the interfaces {@code Cloneable} and {@code Serializable} are returned in that order.

    If this object represents an interface, the array contains objects representing all interfaces directly extended by the interface. The order of the interface objects in the array corresponds to the order of the interface names in the {@code extends} clause of the declaration of the interface represented by this object.

    If this object represents a class or interface that implements no interfaces, the method returns an array of length 0.

    If this object represents a primitive type or void, the method returns an array of length 0.

 public Type getGenericSuperclass() 
    Returns the {@code Type} representing the direct superclass of the entity (class, interface, primitive type or void) represented by this {@code Class}.

    If the superclass is a parameterized type, the {@code Type} object returned must accurately reflect the actual type parameters used in the source code. The parameterized type representing the superclass is created if it had not been created before. See the declaration of ParameterizedType for the semantics of the creation process for parameterized types. If this {@code Class} represents either the {@code Object} class, an interface, a primitive type, or void, then null is returned. If this object represents an array class then the {@code Class} object representing the {@code Object} class is returned.

 public native Class<?>[] getInterfaces()
    Determines the interfaces implemented by the class or interface represented by this object.

    If this object represents a class, the return value is an array containing objects representing all interfaces implemented by the class. The order of the interface objects in the array corresponds to the order of the interface names in the {@code implements} clause of the declaration of the class represented by this object. For example, given the declaration:

    {@code class Shimmer implements FloorWax, DessertTopping { ... }}
    suppose the value of {@code s} is an instance of {@code Shimmer}; the value of the expression:
    {@code s.getClass().getInterfaces()[0]}
    is the {@code Class} object that represents interface {@code FloorWax}; and the value of:
    {@code s.getClass().getInterfaces()[1]}
    is the {@code Class} object that represents interface {@code DessertTopping}.

    If this object represents an interface, the array contains objects representing all interfaces extended by the interface. The order of the interface objects in the array corresponds to the order of the interface names in the {@code extends} clause of the declaration of the interface represented by this object.

    If this object represents a class or interface that implements no interfaces, the method returns an array of length 0.

    If this object represents a primitive type or void, the method returns an array of length 0.

 public Method getMethod(String name,
    Class<?> parameterTypes) throws NoSuchMethodException, SecurityException 
    Returns a {@code Method} object that reflects the specified public member method of the class or interface represented by this {@code Class} object. The {@code name} parameter is a {@code String} specifying the simple name of the desired method. The {@code parameterTypes} parameter is an array of {@code Class} objects that identify the method's formal parameter types, in declared order. If {@code parameterTypes} is {@code null}, it is treated as if it were an empty array.

    If the {@code name} is "{@code };"or "{@code }" a {@code NoSuchMethodException} is raised. Otherwise, the method to be reflected is determined by the algorithm that follows. Let C be the class represented by this object:

    1. C is searched for any matching methods. If no matching method is found, the algorithm of step 1 is invoked recursively on the superclass of C.
    2. If no method was found in step 1 above, the superinterfaces of C are searched for a matching method. If any such method is found, it is reflected.
    To find a matching method in a class C:  If C declares exactly one public method with the specified name and exactly the same formal parameter types, that is the method reflected. If more than one such method is found in C, and one of these methods has a return type that is more specific than any of the others, that method is reflected; otherwise one of the methods is chosen arbitrarily.

    Note that there may be more than one matching method in a class because while the Java language forbids a class to declare multiple methods with the same signature but different return types, the Java virtual machine does not. This increased flexibility in the virtual machine can be used to implement various language features. For example, covariant returns can be implemented with {@linkplain java.lang.reflect.Method#isBridge bridge methods}; the bridge method and the method being overridden would have the same signature but different return types.

    See The Java Language Specification, sections 8.2 and 8.4.

 public Method[] getMethods() throws SecurityException 
    Returns an array containing {@code Method} objects reflecting all the public member methods of the class or interface represented by this {@code Class} object, including those declared by the class or interface and those inherited from superclasses and superinterfaces. Array classes return all the (public) member methods inherited from the {@code Object} class. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if this {@code Class} object represents a class or interface that has no public member methods, or if this {@code Class} object represents a primitive type or void.

    The class initialization method {@code } is not included in the returned array. If the class declares multiple public member methods with the same parameter types, they are all included in the returned array.

    See The Java Language Specification, sections 8.2 and 8.4.

 public native int getModifiers()
    Returns the Java language modifiers for this class or interface, encoded in an integer. The modifiers consist of the Java Virtual Machine's constants for {@code public}, {@code protected}, {@code private}, {@code final}, {@code static}, {@code abstract} and {@code interface}; they should be decoded using the methods of class {@code Modifier}.

    If the underlying class is an array class, then its {@code public}, {@code private} and {@code protected} modifiers are the same as those of its component type. If this {@code Class} represents a primitive type or void, its {@code public} modifier is always {@code true}, and its {@code protected} and {@code private} modifiers are always {@code false}. If this object represents an array class, a primitive type or void, then its {@code final} modifier is always {@code true} and its interface modifier is always {@code false}. The values of its other modifiers are not determined by this specification.

    The modifier encodings are defined in The Java Virtual Machine Specification, table 4.1.

 public String getName() 
    Returns the name of the entity (class, interface, array class, primitive type, or void) represented by this {@code Class} object, as a {@code String}.

    If this class object represents a reference type that is not an array type then the binary name of the class is returned, as specified by The Java™ Language Specification.

    If this class object represents a primitive type or void, then the name returned is a {@code String} equal to the Java language keyword corresponding to the primitive type or void.

    If this class object represents a class of arrays, then the internal form of the name consists of the name of the element type preceded by one or more '{@code [}' characters representing the depth of the array nesting. The encoding of element type names is as follows:

    Element Type     Encoding
    boolean     Z
    byte     B
    char     C
    class or interface     Lclassname;
    double     D
    float     F
    int     I
    long     J
    short     S

    The class or interface name classname is the binary name of the class specified above.

    Examples:

    String.class.getName()
        returns "java.lang.String"
    byte.class.getName()
        returns "byte"
    (new Object[3]).getClass().getName()
        returns "[Ljava.lang.Object;"
    (new int[3][4][5][6][7][8][9]).getClass().getName()
        returns "[[[[[[[I"
    
 public Package getPackage() 
    Gets the package for this class. The class loader of this class is used to find the package. If the class was loaded by the bootstrap class loader the set of packages loaded from CLASSPATH is searched to find the package of the class. Null is returned if no package object was created by the class loader of this class.

    Packages have attributes for versions and specifications only if the information was defined in the manifests that accompany the classes, and if the class loader created the package instance with the attributes from the manifest.

 static native Class getPrimitiveClass(String name)
 public ProtectionDomain getProtectionDomain() 
    Returns the {@code ProtectionDomain} of this class. If there is a security manager installed, this method first calls the security manager's {@code checkPermission} method with a {@code RuntimePermission("getProtectionDomain")} permission to ensure it's ok to get the {@code ProtectionDomain}.
 public URL getResource(String name) 
    Finds a resource with a given name. The rules for searching resources associated with a given class are implemented by the defining {@linkplain ClassLoader class loader} of the class. This method delegates to this object's class loader. If this object was loaded by the bootstrap class loader, the method delegates to ClassLoader#getSystemResource .

    Before delegation, an absolute resource name is constructed from the given resource name using this algorithm:

    • If the {@code name} begins with a {@code '/'} ('\u002f'), then the absolute name of the resource is the portion of the {@code name} following the {@code '/'}.
    • Otherwise, the absolute name is of the following form:
      {@code modified_package_name/name}

      Where the {@code modified_package_name} is the package name of this object with {@code '/'} substituted for {@code '.'} ('\u002e').

 public InputStream getResourceAsStream(String name) 
    Finds a resource with a given name. The rules for searching resources associated with a given class are implemented by the defining {@linkplain ClassLoader class loader} of the class. This method delegates to this object's class loader. If this object was loaded by the bootstrap class loader, the method delegates to ClassLoader#getSystemResourceAsStream .

    Before delegation, an absolute resource name is constructed from the given resource name using this algorithm:

    • If the {@code name} begins with a {@code '/'} ('\u002f'), then the absolute name of the resource is the portion of the {@code name} following the {@code '/'}.
    • Otherwise, the absolute name is of the following form:
      {@code modified_package_name/name}

      Where the {@code modified_package_name} is the package name of this object with {@code '/'} substituted for {@code '.'} ('\u002e').

 public native Object[] getSigners()
    Gets the signers of this class.
 public String getSimpleName() 
    Returns the simple name of the underlying class as given in the source code. Returns an empty string if the underlying class is anonymous.

    The simple name of an array is the simple name of the component type with "[]" appended. In particular the simple name of an array whose component type is anonymous is "[]".

 public native Class<? super T> getSuperclass()
    Returns the {@code Class} representing the superclass of the entity (class, interface, primitive type or void) represented by this {@code Class}. If this {@code Class} represents either the {@code Object} class, an interface, a primitive type, or void, then null is returned. If this object represents an array class then the {@code Class} object representing the {@code Object} class is returned.
 public TypeVariable<T>[] getTypeParameters() 
    Returns an array of {@code TypeVariable} objects that represent the type variables declared by the generic declaration represented by this {@code GenericDeclaration} object, in declaration order. Returns an array of length 0 if the underlying generic declaration declares no type variables.
 public boolean isAnnotation() 
    Returns true if this {@code Class} object represents an annotation type. Note that if this method returns true, #isInterface() would also return true, as all annotation types are also interfaces.
 public boolean isAnnotationPresent(Class<Annotation> annotationClass) 
 public boolean isAnonymousClass() 
    Returns {@code true} if and only if the underlying class is an anonymous class.
 public native boolean isArray()
    Determines if this {@code Class} object represents an array class.
 public native boolean isAssignableFrom(Class<?> cls)
    Determines if the class or interface represented by this {@code Class} object is either the same as, or is a superclass or superinterface of, the class or interface represented by the specified {@code Class} parameter. It returns {@code true} if so; otherwise it returns {@code false}. If this {@code Class} object represents a primitive type, this method returns {@code true} if the specified {@code Class} parameter is exactly this {@code Class} object; otherwise it returns {@code false}.

    Specifically, this method tests whether the type represented by the specified {@code Class} parameter can be converted to the type represented by this {@code Class} object via an identity conversion or via a widening reference conversion. See The Java Language Specification, sections 5.1.1 and 5.1.4 , for details.

 public boolean isEnum() 
    Returns true if and only if this class was declared as an enum in the source code.
 public native boolean isInstance(Object obj)
    Determines if the specified {@code Object} is assignment-compatible with the object represented by this {@code Class}. This method is the dynamic equivalent of the Java language {@code instanceof} operator. The method returns {@code true} if the specified {@code Object} argument is non-null and can be cast to the reference type represented by this {@code Class} object without raising a {@code ClassCastException.} It returns {@code false} otherwise.

    Specifically, if this {@code Class} object represents a declared class, this method returns {@code true} if the specified {@code Object} argument is an instance of the represented class (or of any of its subclasses); it returns {@code false} otherwise. If this {@code Class} object represents an array class, this method returns {@code true} if the specified {@code Object} argument can be converted to an object of the array class by an identity conversion or by a widening reference conversion; it returns {@code false} otherwise. If this {@code Class} object represents an interface, this method returns {@code true} if the class or any superclass of the specified {@code Object} argument implements this interface; it returns {@code false} otherwise. If this {@code Class} object represents a primitive type, this method returns {@code false}.

 public native boolean isInterface()
    Determines if the specified {@code Class} object represents an interface type.
 public boolean isLocalClass() 
    Returns {@code true} if and only if the underlying class is a local class.
 public boolean isMemberClass() 
    Returns {@code true} if and only if the underlying class is a member class.
 public native boolean isPrimitive()
    Determines if the specified {@code Class} object represents a primitive type.

    There are nine predefined {@code Class} objects to represent the eight primitive types and void. These are created by the Java Virtual Machine, and have the same names as the primitive types that they represent, namely {@code boolean}, {@code byte}, {@code char}, {@code short}, {@code int}, {@code long}, {@code float}, and {@code double}.

    These objects may only be accessed via the following public static final variables, and are the only {@code Class} objects for which this method returns {@code true}.

 public boolean isSynthetic() 
    Returns {@code true} if this class is a synthetic class; returns {@code false} otherwise.
 public T newInstance() throws InstantiationException, IllegalAccessException 
    Creates a new instance of the class represented by this {@code Class} object. The class is instantiated as if by a {@code new} expression with an empty argument list. The class is initialized if it has not already been initialized.

    Note that this method propagates any exception thrown by the nullary constructor, including a checked exception. Use of this method effectively bypasses the compile-time exception checking that would otherwise be performed by the compiler. The Constructor.newInstance method avoids this problem by wrapping any exception thrown by the constructor in a (checked) java.lang.reflect.InvocationTargetException .

  void setAnnotationType(AnnotationType type) 
 native  void setProtectionDomain0(ProtectionDomain pd)
    Set the ProtectionDomain for this class. Called by ClassLoader.defineClass.
 native  void setSigners(Object[] signers)
    Set the signers of this class.
 public String toString() 
    Converts the object to a string. The string representation is the string "class" or "interface", followed by a space, and then by the fully qualified name of the class in the format returned by {@code getName}. If this {@code Class} object represents a primitive type, this method returns the name of the primitive type. If this {@code Class} object represents void this method returns "void".