examples
public class: Sort [javadoc |
source]
java.lang.Object
examples.Sort
Example code for log4j to viewed in conjunction with the
SortAlgo class.
This program expects a configuration file name as its first
argument, and the size of the array to sort as the second and last
argument. See its source
code for more details.
Play around with different values in the configuration file and
watch the changing behavior.
Example configuration files can be found in sort1.properties, sort2.properties, sort3.properties and sort4.properties are supplied with the
package.
If you are also interested in logging performance, then have
look at the org.apache.log4j.performance.Logging class.
| Field Summary |
|---|
| static Logger | logger | |
| Method from examples.Sort Summary: |
|---|
|
main, usage |
| Method from examples.Sort Detail: |
|---|
 public static void main(String[] args) {
if(args.length != 2) {
usage("Incorrect number of parameters.");
}
int arraySize = -1;
try {
arraySize = Integer.valueOf(args[1]).intValue();
if(arraySize < = 0)
usage("Negative array size.");
}
catch(java.lang.NumberFormatException e) {
usage("Could not number format ["+args[1]+"].");
}
PropertyConfigurator.configure(args[0]);
int[] intArray = new int[arraySize];
logger.info("Populating an array of " + arraySize + " elements in" +
" reverse order.");
for(int i = arraySize -1 ; i >= 0; i--) {
intArray[i] = arraySize - i - 1;
}
SortAlgo sa1 = new SortAlgo(intArray);
sa1.bubbleSort();
sa1.dump();
// We intentionally initilize sa2 with null.
SortAlgo sa2 = new SortAlgo(null);
logger.info("The next log statement should be an error message.");
sa2.dump();
logger.info("Exiting main method.");
}
|
static void usage(String errMsg) {
System.err.println(errMsg);
System.err.println("\nUsage: java org.apache.examples.Sort " +
"configFile ARRAY_SIZE\n"+
"where configFile is a configuration file\n"+
" ARRAY_SIZE is a positive integer.\n");
System.exit(1);
} |
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