test/jdk/java/math/BigInteger/DoubleValueOverflow.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
 * @test
 * @bug 8021203
 * @summary Test that doubleValue() doesn't overflow
 * @author Dmitry Nadezhin
 */
import java.math.BigInteger;

public class DoubleValueOverflow {

    public static void main(String[] args) {
        try {
            BigInteger x = BigInteger.valueOf(2).shiftLeft(Integer.MAX_VALUE); // x = pow(2,pow(2,31))
            if (x.doubleValue() != Double.POSITIVE_INFINITY) {
                throw new RuntimeException("Incorrect doubleValue() " + x.doubleValue());
            }
            System.out.println("Passed with correct result");
        } catch (ArithmeticException e) {
            // expected
            System.out.println("Overflow is reported by ArithmeticException, as expected");
        } catch (OutOfMemoryError e) {
            // possible
            System.err.println("DoubleValueOverflow skipped: OutOfMemoryError");
            System.err.println("Run jtreg with -javaoption:-Xmx8g");
        }
    }
}