chapter21n3.java

来自「JAVA源代码程序aashjkjhkjhkjhjkhkj」· Java 代码 · 共 44 行

/**
 *
 * demonstration of instanceof, etc
 *
 * Written by: Roger Garside
 *
 * First Written: 5/Feb/97
 * Last Rewritten: 5/Feb/97
 *
 */

import java.io.* ;
import java.lancs.* ;
import java.util.* ;

public class Chapter21n3
    {
    public static void main(String[] args) throws Exception
	{
	funnyMethod("Hello Word") ;
	funnyMethod(new Integer(42)) ;
	funnyMethod(new Person()) ;
	} // end of method main

    public static void funnyMethod(Object x)
	{
	if (x instanceof String)
	    {
	    System.err.println("It was a String **" + x + "**") ;
	    }
        else if (x instanceof Integer)
	    {
	    System.err.println("It was an Integer **" + x + "**") ;
	    }
        else
	    {
	    System.err.println("It was a " + x.getClass().getName() + " **"
						+ x + "**") ;
	    }
	} // end of method funnyMethod

    } // end of class Chapter21n3