Java example source code file (RangeTests.java)

This example Java source code file (RangeTests.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bigdecimal, biginteger, incurred, math, mathcontext, rangetests, runtimeexception

The RangeTests.java Java example source code

/*
 * Copyright (c) 2003, 2011, 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 7036582
 * @summary Some new tests for the add method and constructor with MathContext.
 * @run main RangeTests
 * @run main/othervm -XX:+AggressiveOpts RangeTests
 * @author Sergey V. Kuksenko
 */

import java.math.BigDecimal;
import java.math.BigInteger;
import java.math.MathContext;

public class RangeTests {


    private static int addTest(BigDecimal arg1, BigDecimal arg2, BigDecimal expectedResult) {
        int failures = 0;
        BigDecimal result = arg1.add(arg2);
        if (!result.equals(expectedResult)) {
            System.out.println("Sum:" +
                    arg1 + " + " +
                    arg2 + " == " +
                    result + "; expected  " +
                    expectedResult
            );
            failures++;
        }
        result = arg2.add(arg1);
        if (!result.equals(expectedResult)) {
            System.out.println("Sum:" +
                    arg2 + " + " +
                    arg1 + " == " +
                    result + "; expected  " +
                    expectedResult
            );
            failures++;
        }
        return failures;
    }

    /*
     *  Test BigDecimal.add(BigDecimal) when values are withing different ranges:
     *  1. within 32 bits
     *  2. within 64 bits
     *  3. outside 64 bits.
     */
    private static int addBoundaryTest() {
        int failures = 0;
        failures += addTest(
                new BigDecimal("85070591730234615847396907784232501249"),
                BigDecimal.valueOf(0),
                new BigDecimal("85070591730234615847396907784232501249") );
        failures += addTest(
                new BigDecimal("-85070591730234615847396907784232501249"),
                BigDecimal.valueOf(0),
                new BigDecimal("-85070591730234615847396907784232501249") );
        failures += addTest(
                new BigDecimal("85070591730234615847396907784232501249"),
                BigDecimal.valueOf(1),
                new BigDecimal("85070591730234615847396907784232501250") );
        failures += addTest(
                new BigDecimal("85070591730234615847396907784232501249"),
                BigDecimal.valueOf(-1),
                new BigDecimal("85070591730234615847396907784232501248") );
        failures += addTest(
                new BigDecimal("-85070591730234615847396907784232501250"),
                BigDecimal.valueOf(-1),
                new BigDecimal("-85070591730234615847396907784232501251") );
        failures += addTest(
                new BigDecimal("-85070591730234615847396907784232501249"),
                BigDecimal.valueOf(1),
                new BigDecimal("-85070591730234615847396907784232501248") );
        failures += addTest(
                new BigDecimal("147573952589676412927"),
                BigDecimal.valueOf(Integer.MAX_VALUE),
                new BigDecimal("147573952591823896574") );
        failures += addTest(
                new BigDecimal("-147573952589676412927"),
                BigDecimal.valueOf(Integer.MAX_VALUE),
                new BigDecimal("-147573952587528929280") );
        failures += addTest(
                new BigDecimal("79228162514264337593543950335"),
                BigDecimal.valueOf(999),
                new BigDecimal("79228162514264337593543951334") );
        failures += addTest(
                new BigDecimal("79228162514264337593543950335"),
                BigDecimal.valueOf(Integer.MAX_VALUE/2),
                new BigDecimal("79228162514264337594617692158") );
        failures += addTest(
                new BigDecimal("79228162514264337593543950335"),
                BigDecimal.valueOf(Integer.MIN_VALUE/2),
                new BigDecimal("79228162514264337592470208511") );
        failures += addTest(
                new BigDecimal("-79228162514264337593543950335"),
                BigDecimal.valueOf(Integer.MAX_VALUE/2),
                new BigDecimal("-79228162514264337592470208512") );
        failures += addTest(
                new BigDecimal("79228162514264337593543950335"),
                BigDecimal.valueOf(-(Integer.MIN_VALUE/2)),
                new BigDecimal("79228162514264337594617692159") );
        failures += addTest(
                new BigDecimal("79228162514264337593543950335"),
                BigDecimal.valueOf(Long.MAX_VALUE/2),
                new BigDecimal("79228162518876023611971338238") );
        failures += addTest(
                new BigDecimal("79228162514264337593543950335"),
                BigDecimal.valueOf(Long.MIN_VALUE/2),
                new BigDecimal("79228162509652651575116562431") );
        failures += addTest(
                new BigDecimal("-79228162514264337593543950335"),
                BigDecimal.valueOf(Long.MAX_VALUE/2),
                new BigDecimal("-79228162509652651575116562432") );
        failures += addTest(
                new BigDecimal("79228162514264337593543950335"),
                BigDecimal.valueOf(-(Long.MIN_VALUE/2)),
                new BigDecimal("79228162518876023611971338239") );
        failures += addTest(
                new BigDecimal("-9223372036854775808"),
                BigDecimal.valueOf(1),
                new BigDecimal("-9223372036854775807") );
        failures += addTest(
                new BigDecimal("-9223372036854775808"),
                BigDecimal.valueOf(Long.MAX_VALUE/2),
                new BigDecimal("-4611686018427387905") );
        failures += addTest(
                new BigDecimal("9223372036854775808"),
                BigDecimal.valueOf(-1),
                new BigDecimal("9223372036854775807") );
        failures += addTest(
                new BigDecimal("9223372036854775808"),
                BigDecimal.valueOf(-Long.MAX_VALUE/2),
                new BigDecimal("4611686018427387905") );

        return failures;
    }

    private static int testRoundingFromBigInteger(BigInteger bi, int scale, MathContext mc) {
        int failures = 0;
        BigDecimal bd1 = new BigDecimal(bi,scale, mc);
        BigDecimal bd2 = (new BigDecimal(bi,scale)).round(mc);
        if (!bd1.equals(bd2)) {
            System.out.println("new BigDecimal(BigInteger,int,MathContext):" +
                    "BigInteger == " +
                    bi + ";  scale == " + scale + "; result == " +
                    bd1 + "; expected  == " +
                    bd2
            );
            failures++;
        }
        return failures;
    }

    private static int roundingConstructorTest() {
        int failures = 0;
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                7, MathContext.DECIMAL64);
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                0, MathContext.DECIMAL64);
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                -7, MathContext.DECIMAL64);
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                7, MathContext.DECIMAL128);
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                177, MathContext.DECIMAL128);
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                177, MathContext.DECIMAL32);
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                177, MathContext.UNLIMITED);
        failures += testRoundingFromBigInteger(
                new BigInteger("85070591730234615847396907784232501249"),
                0, MathContext.UNLIMITED);
        return failures;
    }

    private static int minLongConstructorTest(MathContext mc) {
        int failures = 0;
        BigDecimal bd1 = new BigDecimal(Long.MIN_VALUE,mc);
        BigDecimal bd2 = new BigDecimal(Long.MIN_VALUE).round(mc);
        if (!bd1.equals(bd2)) {
            System.out.println("new BigDecimal(long,MathContext):" +
                    "long == " +
                    Long.MIN_VALUE + "; result == " +
                    bd1 + "; expected  == " +
                    bd2
            );
            failures++;
        }
        return failures;
    }

    private static int minLongConstructorTest() {
        int failures = 0;
        failures+=minLongConstructorTest(MathContext.UNLIMITED);
        failures+=minLongConstructorTest(MathContext.DECIMAL32);
        failures+=minLongConstructorTest(MathContext.DECIMAL64);
        failures+=minLongConstructorTest(MathContext.DECIMAL128);
        return failures;
    }

    public static void main(String argv[]) {
        int failures = 0;

        failures += addBoundaryTest();
        failures += roundingConstructorTest();
        failures += minLongConstructorTest();
        if (failures > 0) {
            throw new RuntimeException("Incurred " + failures +
                                       " failures while testing.");
        }
    }



}