jdk/test/java/awt/Color/OpacityChange/OpacityChange.java

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 * 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,
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/*
  @test
  @bug 6783910
  @summary java.awt.Color.brighter()/darker() methods make color opaque
  @author Andrei Dmitriev: area=awt-color
  @run main OpacityChange
*/

import java.awt.*;

public class OpacityChange {
    private final static int INITIAL_ALPHA = 125;

    public static void main(String argv[]) {
        Color color = new Color(20, 20, 20, INITIAL_ALPHA);
        System.out.println("Initial alpha: " + color.getAlpha());
        Color colorBrighter = color.brighter();
        System.out.println("New alpha (after brighter): " + colorBrighter.getAlpha());

        Color colorDarker = color.darker();
        System.out.println("New alpha (after darker): " + colorDarker.getAlpha());


        if (INITIAL_ALPHA != colorBrighter.getAlpha()) {
            throw new RuntimeException("Brighter color alpha has changed from : " +INITIAL_ALPHA + " to " + colorBrighter.getAlpha());
        }
        if (INITIAL_ALPHA != colorDarker.getAlpha()) {
            throw new RuntimeException("Darker color alpha has changed from : " +INITIAL_ALPHA + " to " + colorDarker.getAlpha());
        }
    }
}