这本Java书籍有错误吗?还是我错过了什么? (显示模式) [英] Is there an error in this Java book? or am I missing something? (DisplayMode)

问题描述

以下代码的编写方式与我正在阅读的Java图书完全相同

The following code is written the exact same way as in a Java book I am reading

package main;

 import java.awt.Color;
 import java.awt.DisplayMode;
 import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.RenderingHints;

 import javax.swing.JFrame;

 public class FullScreenTest extends JFrame {
public static void main(String[] args) {
    DisplayMode displayMode;
    if (args.length == 3) {
        displayMode = new DisplayMode(Integer.parseInt(args[0]),
                Integer.parseInt(args[1]),        Integer.parseInt(args[2]),
                DisplayMode.REFRESH_RATE_UNKNOWN);

    } else {
        displayMode = new DisplayMode(800, 600, 16,
                DisplayMode.REFRESH_RATE_UNKNOWN);
    }
    FullScreenTest test = new FullScreenTest();
    test.run(displayMode);
}

private static final long DEMO_TIME = 1000;

public void run(DisplayMode displayMode) {
    setBackground(Color.blue);
    setForeground(Color.white);
    setFont(new Font("Dialog", Font.PLAIN, 24));

    SimpleScreenManager screen = new SimpleScreenManager();
    try {
        screen.setFullScreen(displayMode, this);
        try {
            Thread.sleep(DEMO_TIME);
        } catch (Exception e) {
        }

    } finally {
        screen.restoreScreen();
    }
}

public void paint(Graphics g) {

    g.drawString("Hello World!", 20, 50);
}
 }

运行此命令时，我会黑屏5秒钟，仅此而已.

When I run this, I get a black screen for 5 seconds, and that's it.

但是，当我更改以下行时:

However when I change the following line:

displayMode = new DisplayMode(800, 600, 16, DisplayMode.REFRESH_RATE_UNKNOWN);

对此:

 displayMode = new DisplayMode(600, 800, 16, DisplayMode.REFRESH_RATE_UNKNOWN);

它运行完美.

为什么会这样?我不太明白.

Why is this happening? I don't quite understand.

谢谢

-史蒂夫

 package main;

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

 import javax.swing.JFrame;

 public class SimpleScreenManager {

private GraphicsDevice device;

public SimpleScreenManager() {
    GraphicsEnvironment environment = GraphicsEnvironment
            .getLocalGraphicsEnvironment();
    device = environment.getDefaultScreenDevice();
}

public void setFullScreen(DisplayMode displayMode, JFrame window) {
    window.setUndecorated(true);
    window.setResizable(false);

    device.setFullScreenWindow(window);

    if (displayMode != null && device.isDisplayChangeSupported()) {

        try {
            device.setDisplayMode(displayMode);
        } catch (Exception e) {

        }

    }
}

public Window getFullScreenWindow() {
    return device.getFullScreenWindow();
}

public void restoreScreen() {
    Window window = device.getFullScreenWindow();
    if (window != null) {
        window.dispose();
    }
    device.setFullScreenWindow(null);
}
 }

推荐答案

DisplayMode与Java全屏独占模式"功能有关，在此处进行了记录:

DisplayMode has to do with Java "Full Screen Exclusive Mode" functions, which are documented here:

• http://docs.oracle.com/javase /tutorial/extra/fullscreen/displaymode.html

http://docs.oracle .com/javase/7/docs/api/java/awt/DisplayMode.html

我鼓励您在这里尝试一些示例程序:

I would encourage you to try some of the sample programs here:

• http://docs.oracle.com/javase/tutorial/extra/fullscreen/example.html

最重要的是:

1)此API不一定支持所有操作系统或显示设备

1) not all OS's or display devices are necessarily supported by this API

2)如果设备本身不支持任意DisplayMode设置，则不一定支持所有组合

2) All combinations of arbitrary DisplayMode settings aren't necessarily supported if the device itself doesn't support them

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