1/* 2 * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* 25 * @test 26 * @bug 8136500 27 * @summary Test Integer.toString method 28 */ 29 30public class ToString { 31 32 public static void main(String[] args) throws Exception { 33 test("-2147483648", Integer.MIN_VALUE); 34 test("2147483647", Integer.MAX_VALUE); 35 test("0", 0); 36 37 // Wiggle around the exponentially increasing base. 38 final int LIMIT = (1 << 15); 39 int base = 10000; 40 while (base < Integer.MAX_VALUE / 10) { 41 for (int d = -LIMIT; d < LIMIT; d++) { 42 int c = base + d; 43 if (c > 0) { 44 buildAndTest(c); 45 } 46 } 47 base *= 10; 48 } 49 50 for (int c = 1; c < LIMIT; c++) { 51 buildAndTest(Integer.MAX_VALUE - LIMIT + c); 52 } 53 } 54 55 private static void buildAndTest(int c) { 56 if (c <= 0) { 57 throw new IllegalArgumentException("Test bug: can only handle positives, " + c); 58 } 59 60 StringBuilder sbN = new StringBuilder(); 61 StringBuilder sbP = new StringBuilder(); 62 63 int t = c; 64 while (t > 0) { 65 char digit = (char) ('0' + (t % 10)); 66 sbN.append(digit); 67 sbP.append(digit); 68 t = t / 10; 69 } 70 71 sbN.append("-"); 72 sbN.reverse(); 73 sbP.reverse(); 74 75 test(sbN.toString(), -c); 76 test(sbP.toString(), c); 77 } 78 79 private static void test(String expected, int value) { 80 String actual = Integer.toString(value); 81 if (!expected.equals(actual)) { 82 throw new RuntimeException("Expected " + expected + ", but got " + actual); 83 } 84 } 85} 86