org.springframework.core: abstract public class: JdkVersion

org.springframework.core
abstract public class: JdkVersion [javadoc | source]

java.lang.Object
   org.springframework.core.JdkVersion

Internal helper class used to find the Java/JDK version that Spring is operating on, to allow for automatically adapting to the present platform's capabilities.

Note that Spring requires JVM 1.4 or higher, as of Spring 2.5.

author: Rod - Johnson

author: Juergen - Hoeller

author: Rick - Evans

Field Summary
public static final int	JAVA_13	Constant identifying the 1.3.x JVM (JDK 1.3).
public static final int	JAVA_14	Constant identifying the 1.4.x JVM (J2SE 1.4).
public static final int	JAVA_15	Constant identifying the 1.5 JVM (Java 5).
public static final int	JAVA_16	Constant identifying the 1.6 JVM (Java 6).
public static final int	JAVA_17	Constant identifying the 1.7 JVM (Java 7).

Method from org.springframework.core.JdkVersion Summary:
getJavaVersion, getMajorJavaVersion, isAtLeastJava14, isAtLeastJava15, isAtLeastJava16

Methods from java.lang.Object:
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from org.springframework.core.JdkVersion Detail:
public static String getJavaVersion() { javaVersion = System.getProperty("java.version"); // version String should look like "1.4.2_10" if (javaVersion.indexOf("1.7.") != -1) { majorJavaVersion = JAVA_17; } else if (javaVersion.indexOf("1.6.") != -1) { majorJavaVersion = JAVA_16; } else if (javaVersion.indexOf("1.5.") != -1) { majorJavaVersion = JAVA_15; } else { // else leave 1.4 as default (it's either 1.4 or unknown) majorJavaVersion = JAVA_14; } return javaVersion; } Return the full Java version string, as returned by `System.getProperty("java.version")`.
public static int getMajorJavaVersion() { return majorJavaVersion; } Get the major version code. This means we can do things like `if (getMajorJavaVersion() < JAVA_14)`.
public static boolean isAtLeastJava14() { return true; } Convenience method to determine if the current JVM is at least Java 1.4.
public static boolean isAtLeastJava15() { return getMajorJavaVersion() >= JAVA_15; } Convenience method to determine if the current JVM is at least Java 1.5 (Java 5).
public static boolean isAtLeastJava16() { return getMajorJavaVersion() >= JAVA_16; } Convenience method to determine if the current JVM is at least Java 1.6 (Java 6).

Method from org.springframework.core.JdkVersion Detail:

 public static String getJavaVersion() {
	 
		javaVersion = System.getProperty("java.version");
		// version String should look like "1.4.2_10"
		if (javaVersion.indexOf("1.7.") != -1) {
			majorJavaVersion = JAVA_17;
		}
		else if (javaVersion.indexOf("1.6.") != -1) {
			majorJavaVersion = JAVA_16;
		}
		else if (javaVersion.indexOf("1.5.") != -1) {
			majorJavaVersion = JAVA_15;
		}
		else {
			// else leave 1.4 as default (it's either 1.4 or unknown)
			majorJavaVersion = JAVA_14;
		}
		return javaVersion;
}

System.getProperty("java.version")

 public static int getMajorJavaVersion() {
		return majorJavaVersion;
}

if (getMajorJavaVersion() < JAVA_14)

 public static boolean isAtLeastJava14() {
		return true;
}

Convenience method to determine if the current JVM is at least Java 1.4.

 public static boolean isAtLeastJava15() {
		return getMajorJavaVersion()  >= JAVA_15;
}

Convenience method to determine if the current JVM is at least Java 1.5 (Java 5).

 public static boolean isAtLeastJava16() {
		return getMajorJavaVersion()  >= JAVA_16;
}

Convenience method to determine if the current JVM is at least Java 1.6 (Java 6).