1 /*
   2  * Copyright 2003 Sun Microsystems, Inc.  All Rights Reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 4855355
  27  * @summary implement "foreach" loops as specified in JSR 201
  28  * @author gafter
  29  *
  30  * @compile -source 1.5 Foreach.java
  31  * @run main Foreach
  32  */
  33 
  34 import java.util.Iterator;
  35 
  36 public class Foreach implements Iterable<Integer> {
  37 
  38     public Iterator<Integer> iterator() {
  39         return new Iterator<Integer>() {
  40             int next = 1;
  41             public boolean hasNext() {
  42                 return next <= (1 << 12);
  43             }
  44             public void remove() {
  45                 throw new UnsupportedOperationException();
  46             }
  47             public Integer next() {
  48                 try {
  49                     return new Integer(next);
  50                 } finally {
  51                     next <<= 1;
  52                 }
  53             }
  54         };
  55     }
  56 
  57     public static void main(String[] args) {
  58         int sum;
  59 
  60         sum = 0;
  61         int[] a = new int[12];
  62         for (int i=0; i<12; i++) a[i] = 1<<i;
  63         for (int i : a) {
  64             if (i > 400) break;
  65             if (i == 16) continue;
  66             sum += i;
  67         }
  68         if (sum != 495)
  69             throw new AssertionError("cogito ergo " + sum);
  70 
  71         sum = 0;
  72         Iterable<Integer> x = new Foreach();
  73         for (Integer j : x)
  74             sum += j.intValue();
  75         if (sum != 8191)
  76             throw new AssertionError("cogito ergo " + sum);
  77 
  78         System.out.println("success!");
  79     }
  80 }