test/jdk/java/awt/GraphicsDevice/DisplayModes/UnknownRefrshRateTest.java

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/**
 * @test
 * @bug 8267430
 * @key headful
 * @summary verify setting a display mode with unknow refresh rate works
 */

import java.awt.DisplayMode;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;

public class UnknownRefrshRateTest {
    private static final int MAX_MODES = 10;

    public static void main(String[] args) throws Exception {

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice[] devices = ge.getScreenDevices();

        for (GraphicsDevice d : devices) {

            if (!d.isDisplayChangeSupported()) {
                continue;
            }
            DisplayMode odm = d.getDisplayMode();
            System.out.println("device=" + d + " original mode=" + odm);

            DisplayMode[] modes = d.getDisplayModes();
            System.out.println("There are " + modes.length + " modes.");
            try {
                int modesCount = modes.length < MAX_MODES ? modes.length : MAX_MODES;

                for (int i=0; i<modesCount; i++) {
                    DisplayMode mode = modes[i];
                    System.out.println("copying from mode " + i + " : " + mode);
                    int w = mode.getWidth();
                    int h = mode.getHeight();
                    int bpp = mode.getBitDepth();
                    int refRate = DisplayMode.REFRESH_RATE_UNKNOWN;
                    DisplayMode newMode = new DisplayMode(w, h, bpp, refRate);
                    d.setDisplayMode(newMode);
                    Thread.sleep(2000);
                    System.out.println("set " + d.getDisplayMode());
                 }
             } finally {
                 System.out.println("restoring original mode"+odm);
                 d.setDisplayMode(odm);
                 Thread.sleep(10000);
             }
       }
    }
}