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 package test.java.lang.Integer; 25 26 /* 27 * @test 28 * @bug 8136500 29 * @summary Test Integer.toString method 30 */ 31 32 public class ToString { 33 main(String[] args)34 public static void main(String[] args) throws Exception { 35 test("-2147483648", Integer.MIN_VALUE); 36 test("2147483647", Integer.MAX_VALUE); 37 test("0", 0); 38 39 // Wiggle around the exponentially increasing base. 40 final int LIMIT = (1 << 15); 41 int base = 10000; 42 while (base < Integer.MAX_VALUE / 10) { 43 for (int d = -LIMIT; d < LIMIT; d++) { 44 int c = base + d; 45 if (c > 0) { 46 buildAndTest(c); 47 } 48 } 49 base *= 10; 50 } 51 52 for (int c = 1; c < LIMIT; c++) { 53 buildAndTest(Integer.MAX_VALUE - LIMIT + c); 54 } 55 } 56 buildAndTest(int c)57 private static void buildAndTest(int c) { 58 if (c <= 0) { 59 throw new IllegalArgumentException("Test bug: can only handle positives, " + c); 60 } 61 62 StringBuilder sbN = new StringBuilder(); 63 StringBuilder sbP = new StringBuilder(); 64 65 int t = c; 66 while (t > 0) { 67 char digit = (char) ('0' + (t % 10)); 68 sbN.append(digit); 69 sbP.append(digit); 70 t = t / 10; 71 } 72 73 sbN.append("-"); 74 sbN.reverse(); 75 sbP.reverse(); 76 77 test(sbN.toString(), -c); 78 test(sbP.toString(), c); 79 } 80 test(String expected, int value)81 private static void test(String expected, int value) { 82 String actual = Integer.toString(value); 83 if (!expected.equals(actual)) { 84 throw new RuntimeException("Expected " + expected + ", but got " + actual); 85 } 86 } 87 } 88