《Java核心技术I》Swing中的边框

边框

BorderFactory静态方法创建边框，凹斜面，凸斜面，蚀刻，直线，蒙版，空白。

边框添加标题，BorderFactory.createTitledBorder

组合边框，BorderFactory.createCompoundBorder

JComponent的setBorder方法添加边框到组件。

package swing;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.Border;
import javax.swing.border.MatteBorder;

public class BorderTest {

    private static JPanel buttonPanel = new JPanel();
    private static ButtonGroup buttonGroup = new ButtonGroup();
    
    
    public static void main(String[] args) {
        
        JFrame frame = new JFrame("边框");
        
        addRadioButton("凹斜面", BorderFactory.createLoweredBevelBorder());
        addRadioButton("凸斜面", BorderFactory.createRaisedBevelBorder());
        addRadioButton("蚀刻", BorderFactory.createEtchedBorder());
        addRadioButton("直线", BorderFactory.createLineBorder(Color.BLUE));
        addRadioButton("蒙版", BorderFactory.createMatteBorder(1, 1, 1, 1, Color.RED));
        addRadioButton("空白", BorderFactory.createEmptyBorder());
        frame.add(buttonPanel,BorderLayout.CENTER);
        
        frame.setSize(600, 400);
        //初始打开为屏幕中央
        Toolkit toolkit = Toolkit.getDefaultToolkit();
        Dimension screenSize = toolkit.getScreenSize();
        int screenWidth = (int) screenSize.getWidth();
        int screenHeight = (int) screenSize.getHeight();
        //计算窗口位置
        int x = (screenWidth - frame.getWidth())/2;
        int y = (screenHeight - frame.getHeight())/2;
        frame.setLocation(x, y);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    
    public static void addRadioButton(String name,Border border) {
        boolean selected = name.equals("空白");
        var button = new JRadioButton(name, selected);
        buttonGroup.add(button);
        Border titled = BorderFactory.createTitledBorder(border, name);
        buttonPanel.setBorder(titled);
        buttonPanel.add(button);
        ActionListener listener = e -> buttonPanel.setBorder(titled);;
        button.addActionListener(listener);
    }

}