ImQi1云笔记

外观

其他Swing知识

设置窗体UI

默认的Swing窗体风格为Metal类型，可以通过使用UIManager类提供的设置UI的方法改变窗体的外观。

UIManager提供了几个静态方法用于获取和改变外观：

  • UIManager.getCrossPlatformLookAndFeelClassName()：获取Java的外观和感觉
  • UIManager.setLookAndFeel()：设置UI组件的外观。
  • JFrame.setDefaultLookAndFeelDecorated(boolean b)：改变框架的外观和感觉。

windows环境下可以用下面两种方法使窗口显示windows风格窗口

  • UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  • UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

除此之外，还可以利用UIManager将UI改变为如下样式：

外观代码
Metal风格(默认)String lookAndFeel ="javax.swing.plaf.metal.MetalLookAndFeel";
UIManager.setLookAndFeel(lookAndFeel);
Windows风格String lookAndFeel ="com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
UIManager.setLookAndFeel(lookAndFeel);
Windows Classic风格String lookAndFeel ="com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel";
UIManager.setLookAndFeel(lookAndFeel);
Motif风格String lookAndFeel ="com.sun.java.swing.plaf.motif.MotifLookAndFeel";
UIManager.setLookAndFeel(lookAndFeel);
Mac风格 (需要在相关的操作系统上方可实现)String lookAndFeel ="com.sun.java.swing.plaf.mac.MacLookAndFeel";
UIManager.setLookAndFeel(lookAndFeel);
GTK风格 (需要在相关的操作系统上方可实现)String lookAndFeel ="com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
UIManager.setLookAndFeel(lookAndFeel);
可跨平台的默认风格String lookAndFeel =UIManager.getCrossPlatformLookAndFeelClassName();
UIManager.setLookAndFeel(lookAndFeel);

使窗体位于屏幕正中央

使用下面的代码即可实现。

package swing;

import javax.swing.*;
import java.awt.*;

class SetFrameAtCenter extends JFrame { //设置窗体默认显示在屏幕中间
    SetFrameAtCenter() {
        super("窗口位于屏幕正中央");
        int sizeX = 500;
        int sizeY = 400;
        Toolkit toolkit = Toolkit.getDefaultToolkit();  //获取工具包
        Dimension screenSize = toolkit.getScreenSize();   //获取屏幕尺寸
        int x = screenSize.width / 2 - sizeX / 2;
        int y = screenSize.height / 2 - sizeY / 2;
        setBounds(x, y, sizeX, sizeY);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        new SetFrameAtCenter();
    }
}

销毁窗口

调用窗口对象的dispose()方法即可。

package swing;

import javax.swing.*;

public class JFrameDispose extends JFrame {
    //窗口的销毁 使用JFrame对象或子类对象的dispose()方法
    JFrameDispose() {
        super("自动销毁窗口");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(300, 200, 100, 100);
        JButton jButton = new JButton("点按按钮销毁此窗口");
        jButton.addActionListener(e -> dispose());
        getContentPane().add(jButton);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new JFrameDispose().setVisible(true);
    }
}

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