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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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/*
 * @test
 * @bug 4990596
 * @summary Make sure that any subclass of Number can be formatted using
 *          DecimalFormat.format() without throwing an exception.
 * @run junit Bug4990596
 */

import java.text.DecimalFormat;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;

public class Bug4990596 {

    // Test that a custom subclass of Number can be formatted by
    // DecimalFormat without throwing an IllegalArgumentException
    @Test
    public void formatSubclassedNumberTest() {
        assertDoesNotThrow(() -> new DecimalFormat().format(new MutableInteger(0)),
                "DecimalFormat.format() should support subclasses of Number");
    }

    // A custom subclass of Number. Prior to this fix, if an instance of this
    // class was formatted by DecimalFormat, an exception would be thrown.
    @SuppressWarnings("serial")
    public static class MutableInteger extends Number {
        public int value;

        public MutableInteger() {
        }
        public MutableInteger(int value) {
            this.value = value;
        }
        public double doubleValue() {
            return this.value;
        }
        public float floatValue() {
            return this.value;
        }
        public int intValue() {
            return this.value;
        }
        public long longValue() {
            return this.value;
        }
    }
}