summaryrefslogtreecommitdiff
path: root/tutorial/examples/freeargs/Collection.oj
blob: 77e4c8151bd67dbbca906c97ef236353b49e17d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
/*
 * Collection.oj
 *
 * Apr 13, 1999  Michiaki Tatsubori
 */
package examples.freeargs;


import examples.freeargs.FreeArgsClass;
import examples.print.*;


/**
 * The class <code>Collection</code> represents a collection of objects.
 */
public class Collection instantiates FreeArgsClass
{

    private Object[] contents;

    public Collection() {
        contents = new Object[0];
    }

    public boolean isEmpty() {
        return (contents.length == 0);
    }

    /** Accepts any number of arguments. */
    public generous void set( Object[] args ) {
        contents = new Object[args.length];
    System.arraycopy( args, 0, contents, 0, args.length );
    }

    /** Accepts any number of arguments. */
    public generous void add( Object[] args ) {
        Object[] old = contents;
        contents = new Object[old.length + args.length];
    System.arraycopy( old, 0, contents, 0, old.length );
    System.arraycopy( args, 0, contents, old.length, args.length );
    }

    public int size() {
        return contents.length;
    }

    /** Obtains a specified object. */
    public Object get( int i ) {
    return contents[i];
    }

}