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 
  31 import java.util.Iterator;
  32 
  33 public class Foreach implements Iterable<Integer> {
  34 
  35     public Iterator<Integer> iterator() {
  36         return new Iterator<Integer>() {
  37             int next = 1;
  38             public boolean hasNext() {
  39                 return next <= (1 << 12);
  40             }
  41             public void remove() {
  42                 throw new UnsupportedOperationException();
  43             }
  44             public Integer next() {
  45                 try {
  46                     return new Integer(next);
  47                 } finally {
  48                     next <<= 1;
  49                 }
  50             }
  51         };
  52     }
  53 
  54     public static void main(String[] args) {
  55         int sum;
  56 
  57         sum = 0;
  58         int[] a = new int[12];
  59         for (int i=0; i<12; i++) a[i] = 1<<i;
  60         for (int i : a) {
  61             if (i > 400) break;
  62             if (i == 16) continue;
  63             sum += i;
  64         }
  65         if (sum != 495)
  66             throw new AssertionError("cogito ergo " + sum);
  67 
  68         sum = 0;
  69         Iterable<Integer> x = new Foreach();
  70         for (Integer j : x)
  71             sum += j.intValue();
  72         if (sum != 8191)
  73             throw new AssertionError("cogito ergo " + sum);
  74 
  75         System.out.println("success!");
  76     }
  77 }