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 }