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 }