1	// Example 5.2 joi/examples/OverridingDemo.java
     2	//
     3	//
     4	// Copyright 2003 Bill Campbell and Ethan Bolker
     5	
     6	// Small program to illustrate overriding and toString()
     7	// 
     8	// Here's what the output looks like:
     9	//
    10	// %> java Overriding jessica Benjamin
    11	// Terminal t = new Terminal();
    12	// nobj = new NamedObject( args[0] );
    13	// nobj.toString():           jessica
    14	// nobj:                      jessica
    15	// nobj.toStringfromObject(): NamedObject@206fdf64
    16	// nobj = new NamedObject( args[1] );
    17	// nobj.toString():           benjamin
    18	// nobj:                      benjamin
    19	// nobj.toStringfromObject(): NamedObject@2103df64 
    20	// 
    21	// toString():                Terminal@201bdf64
    22	// t:                         Terminal@201bdf64
    23	
    24	public class OverridingDemo
    25	{
    26	    public static void main( String[] args )   
    27	    {
    28	        Terminal t = new Terminal();
    29	        NamedObject nobj;
    30	
    31	        t.println("Terminal t = new Terminal();");
    32	        t.println("nobj = new NamedObject( args[0] );");
    33	        nobj = new NamedObject( args[0] );
    34	        t.println( "nobj.toString():           " + nobj.toString() );
    35	        t.println( "nobj:                      " + nobj );
    36	        t.println( "nobj.toStringfromObject(): " + 
    37	                   nobj.toStringfromObject());
    38	
    39	        t.println("nobj = new NamedObject( args[1] );");
    40	        nobj = new NamedObject( args[1] );
    41	        t.println( "nobj.toString():           " + nobj.toString() );
    42	        t.println( "nobj:                      " + nobj );
    43	        t.println( "nobj.toStringfromObject(): " + 
    44	                   nobj.toStringfromObject());
    45	
    46	        t.println( "\ntoString():                " + t.toString() );
    47	        t.println( "t:                         " + t );
    48	    } 
    49	}
    50	
    51	// A simple class whose instances have one field 
    52	// and several toString methods. Visible only inside
    53	// the OverridingDemo class.
    54	
    55	// you can put two classes in one file as long as only one of them
    56	// is public
    57	
    58	class NamedObject // extends Object, by default 
    59	{  
    60	    private String name;
    61	        
    62	    // constructor does the obvious thing
    63	
    64	    public NamedObject( String name ) 
    65	    {
    66	        this.name = name;
    67	    }
    68	
    69	    // override toString in class Object     
    70	
    71	    public String toString()
    72	    {
    73	        return name;
    74	    }
    75	        
    76	    // access to the overridden method using super
    77	
    78	    public String toStringfromObject() 
    79	    {
    80	        return super.toString();
    81	    }
    82	}