Quelle BigDecimalRounding.java Sprache: JAVA

/*
* Copyright (c) 2021, 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
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* questions.
*/

/**
* @test
* @bug 8262744
* @summary BigDecimal does not always display formatting correctly because
* rounding is done after formatting check. Fix moves rounding to before the
* range-based formatting check for %g formatting flag.
* @run testng BigDecimalRounding
*/

import org.testng.annotations.Test;

import java.math.BigDecimal;

import static org.testng.Assert.*;

@Test
public class BigDecimalRounding {

    public static void testBigDecimalRounding() {
        var res1 = String.format("%g", 0.00009999999999999995);
        var res2 = String.format("%g", 0.00009999999f);
        var res3 = String.format("%g", new BigDecimal(0.0001));
        var res4 = String.format("%g", new BigDecimal("0.00009999999999999999995"));

        assertEquals(res1, res2);
        assertEquals(res2, res3);
        assertEquals(res3, res4);

        var res5 = String.format("%.9g", 999999.999999432168754e+3);
        var res6 = String.format("%.9g", 999999999.999432168754f);
        var res7 = String.format("%.9g", new BigDecimal("999999.999999432168754e+3")); // !!
        var res8 = String.format("%.9g", new BigDecimal("1000000000")); // !!

        assertEquals(res5, res6);
        assertEquals(res6, res7);
        assertEquals(res7, res8);

    }
}

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