FileDocCategorySizeDatePackage
Sort.javaAPI DocApache log4j 1.2.153231Sat Aug 25 00:09:44 BST 2007examples

Sort

public class Sort extends Object
Example code for log4j to viewed in conjunction with the {@link examples.SortAlgo 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 {@link org.apache.log4j.performance.Logging} class.

author
Ceki Gülcü

Fields Summary
static Logger
logger
Constructors Summary
Methods Summary
public static voidmain(java.lang.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 voidusage(java.lang.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);