Bug4990596.java

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/**
 * @test
 * @bug 4990596
 * @summary Make sure that any subclass of Number can be formatted using DecimalFormat.format().
 */

import java.text.DecimalFormat;

public class Bug4990596 {

    public static void main(String[] args) {
        new DecimalFormat().format(new MutableInteger(0));
    }

    @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;
        }
    }
}