90 lines
2.7 KiB
Java
90 lines
2.7 KiB
Java
/*
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* Copyright (c) 2015, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8136500 8310929
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* @summary Test Integer.toString method for both compact and non-compact strings
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* @run junit/othervm -XX:+CompactStrings ToString
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* @run junit/othervm -XX:-CompactStrings ToString
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*/
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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public class ToString {
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@Test
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public void testBase10() {
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test("-2147483648", Integer.MIN_VALUE);
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test("2147483647", Integer.MAX_VALUE);
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test("0", 0);
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// Wiggle around the exponentially increasing base.
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final int LIMIT = (1 << 15);
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int base = 10000;
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while (base < Integer.MAX_VALUE / 10) {
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for (int d = -LIMIT; d < LIMIT; d++) {
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int c = base + d;
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if (c > 0) {
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buildAndTest(c);
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}
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}
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base *= 10;
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}
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for (int c = 1; c < LIMIT; c++) {
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buildAndTest(Integer.MAX_VALUE - LIMIT + c);
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}
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}
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private static void buildAndTest(int c) {
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if (c <= 0) {
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throw new IllegalArgumentException("Test bug: can only handle positives, " + c);
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}
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StringBuilder sbN = new StringBuilder();
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StringBuilder sbP = new StringBuilder();
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int t = c;
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while (t > 0) {
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char digit = (char) ('0' + (t % 10));
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sbN.append(digit);
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sbP.append(digit);
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t = t / 10;
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}
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sbN.append("-");
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sbN.reverse();
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sbP.reverse();
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test(sbN.toString(), -c);
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test(sbP.toString(), c);
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}
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private static void test(String expected, int value) {
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assertEquals(expected, Integer.toString(value));
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}
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}
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