Mega Code Archive
Demonstration of how to obtain instances of java lang Class
<![CDATA[
/*
* file: ObtainingClassInstances.java
* package: oreilly.hcj.reflection
*
* This software is granted under the terms of the Common Public License,
* CPL, which may be found at the following URL:
* http://www-124.ibm.com/developerworks/oss/CPLv1.0.htm
*
* Copyright(c) 2003-2005 by the authors indicated in the @author tags.
* All Rights are Reserved by the various authors.
*
########## DO NOT EDIT ABOVE THIS LINE ########## */
/**
* Demonstration of how to obtain instances of <tt>java.lang.Class</tt>.
*
* @author <a href=mailto:kraythe@arcor.de>Robert Simmons jr. (kraythe)</a>
* @version $Revision: 1.3 $
*/
public class ObtainingClassInstances {
/** An Integer object */
protected static Integer someInteger = new Integer(10);
/** A generic object. */
protected static Object someObject = null;
/** A String. */
protected static String someString = new String("Hardcore Java");
/** An int. */
protected static int someInt = 15;
/** An array of ints. */
protected static int[] intArray = new int[] { 4, 5, 7, 9 };
/**
* Main method.
*
* @param args Command line arguments.
*/
public static void main(final String[] args) {
// -- Print out the Class instances.
System.out.println(someInteger.getClass());
System.out.println(someString.getClass());
System.out.println(intArray.getClass());
System.out.println(Object.class);
System.out.println(Integer.class);
System.out.println(int.class);
System.out.println(String.class);
System.out.println(Comparable.class);
System.out.println(Object[].class);
// -- Things that WON'T work
// System.out.println(someObject.getClass()); // <= Exception
// System.out.println(someInt.getClass()); // <= Compiler errror
}
/**
* Demonstration of a method that doesnt check for null.
*
* @param obj The object passed.
*/
public void writeClass(final Object obj) {
System.out.println(obj.getClass());
}
}
/* ########## End of File ########## */
]]>