| /* |
| * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6473768 |
| * @summary Tests of BigInteger.compareTo |
| * @author Joseph D. Darcy |
| */ |
| import java.math.*; |
| import static java.math.BigInteger.*; |
| |
| public class CompareToTests { |
| private static int compareToTests() { |
| int failures = 0; |
| |
| final BigInteger MINUS_ONE = BigInteger.ONE.negate(); |
| final BigInteger TWO_POW_126 = ONE.shiftLeft(126); |
| final BigInteger TWO_POW_127 = ONE.shiftLeft(127); |
| final BigInteger TWO_POW_128 = ONE.shiftLeft(128); |
| |
| // First operand, second operand, expected compareTo result |
| BigInteger [][] testCases = { |
| // Basics |
| {valueOf(0), valueOf(0), ZERO}, |
| {valueOf(0), valueOf(1), MINUS_ONE}, |
| {valueOf(1), valueOf(2), MINUS_ONE}, |
| {valueOf(2), valueOf(1), ONE}, |
| {valueOf(10), valueOf(10), ZERO}, |
| |
| // Various relative lengths of internal mag array. |
| {TWO_POW_127, TWO_POW_127, ZERO}, |
| {TWO_POW_127.negate(), TWO_POW_127, MINUS_ONE}, |
| |
| {TWO_POW_128.or(TWO_POW_126), TWO_POW_128, ONE}, |
| {TWO_POW_128.or(TWO_POW_126), TWO_POW_128.negate(), ONE}, |
| |
| {TWO_POW_128, TWO_POW_128.or(TWO_POW_126), MINUS_ONE}, |
| {TWO_POW_128.negate(), TWO_POW_128.or(TWO_POW_126), MINUS_ONE}, |
| |
| {TWO_POW_127, TWO_POW_128, MINUS_ONE}, |
| {TWO_POW_127.negate(), TWO_POW_128, MINUS_ONE}, |
| |
| {TWO_POW_128, TWO_POW_127, ONE}, |
| {TWO_POW_128.negate(), TWO_POW_127, MINUS_ONE}, |
| |
| // Long boundary and near boundary values |
| {valueOf(Long.MAX_VALUE), valueOf(Long.MAX_VALUE), ZERO}, |
| {valueOf(Long.MAX_VALUE).negate(), valueOf(Long.MAX_VALUE), MINUS_ONE}, |
| |
| {valueOf(Long.MAX_VALUE-1), valueOf(Long.MAX_VALUE), MINUS_ONE}, |
| {valueOf(Long.MAX_VALUE-1).negate(), valueOf(Long.MAX_VALUE), MINUS_ONE}, |
| |
| {valueOf(Long.MIN_VALUE), valueOf(Long.MAX_VALUE), MINUS_ONE}, |
| {valueOf(Long.MIN_VALUE).negate(), valueOf(Long.MAX_VALUE), ONE}, |
| |
| {valueOf(Long.MIN_VALUE+1), valueOf(Long.MAX_VALUE), MINUS_ONE}, |
| {valueOf(Long.MIN_VALUE+1).negate(), valueOf(Long.MAX_VALUE), ZERO}, |
| |
| {valueOf(Long.MAX_VALUE), valueOf(Long.MIN_VALUE), ONE}, |
| {valueOf(Long.MAX_VALUE).negate(), valueOf(Long.MIN_VALUE), ONE}, |
| |
| {valueOf(Long.MAX_VALUE-1), valueOf(Long.MIN_VALUE), ONE}, |
| {valueOf(Long.MAX_VALUE-1).negate(), valueOf(Long.MIN_VALUE), ONE}, |
| |
| {valueOf(Long.MIN_VALUE), valueOf(Long.MIN_VALUE), ZERO}, |
| {valueOf(Long.MIN_VALUE).negate(), valueOf(Long.MIN_VALUE), ONE}, |
| |
| {valueOf(Long.MIN_VALUE+1), valueOf(Long.MIN_VALUE), ONE}, |
| {valueOf(Long.MIN_VALUE+1).negate(), valueOf(Long.MIN_VALUE), ONE}, |
| }; |
| |
| for (BigInteger[] testCase : testCases) { |
| BigInteger a = testCase[0]; |
| BigInteger a_negate = a.negate(); |
| BigInteger b = testCase[1]; |
| BigInteger b_negate = b.negate(); |
| int expected = testCase[2].intValue(); |
| |
| failures += compareToTest(a, b, expected); |
| failures += compareToTest(a_negate, b_negate, -expected); |
| } |
| |
| |
| return failures; |
| } |
| |
| private static int compareToTest(BigInteger a, BigInteger b, int expected) { |
| int result = a.compareTo(b); |
| int failed = (result==expected) ? 0 : 1; |
| if (failed == 1) { |
| System.err.println("(" + a + ").compareTo(" + b + ") => " + result + |
| "\n\tExpected " + expected); |
| } |
| return failed; |
| } |
| |
| public static void main(String argv[]) { |
| int failures = 0; |
| |
| failures += compareToTests(); |
| |
| if (failures > 0) { |
| throw new RuntimeException("Incurred " + failures + |
| " failures while testing exact compareTo."); |
| } |
| } |
| } |