如何製作一個自定義的JButton類？

Question

嗨，即時通訊尋找一種解決方案，使用Java Swing製作自定義按鈕。 我有一個例子應該如何，但它不顯示按鈕文本。有人知道錯誤在哪裏嗎？

這是一個JButton類

package custombutton; 

import java.awt.*; 
import java.awt.event.MouseListener; 
import java.awt.event.MouseEvent; 

import javax.swing.JButton; 
import javax.swing.border.LineBorder; 

public class CustomButton extends JButton implements MouseListener { 

    Dimension size = new Dimension(206, 30); 

    boolean hover = false; 
    boolean click = false; 
    String text; 

    public CustomButton(String text) { 
     setVisible(true); 
     setFocusable(true); 
     setContentAreaFilled(false); 
     setBorderPainted(true); 
     setBorder(new LineBorder(Color.BLACK, 3)); 

     setButtonText(text); 


     addMouseListener(this); 
    } 

    @Override 
    public void paintComponent(Graphics g) { 
     super.paintComponent(g); 


     g.setColor(new Color(255, 255, 255)); 

     g.fillRect(0, 0, 206, 30); 


     g.setFont(Font.decode("arial-24")); 

     FontMetrics metrics = g.getFontMetrics(); 

     int width = metrics.stringWidth(getButtonText()); 

     g.drawString(text, 103 - width/2, 15); 

    } 

    @Override 
    public Dimension getPreferredSize() { 
     return size; 
    } 

    @Override 
    public Dimension getMaximumSize() { 
     return size; 
    } 

    @Override 
    public Dimension getMinimumSize() { 
     return size; 
    } 

    public void setButtonText(String text) { 
     this.text = text; 
    } 

    public String getButtonText() { 
     return text; 
    } 

    @Override 
    public void mouseEntered(MouseEvent e) { 
     hover = true; 
    } 

    @Override 
    public void mouseExited(MouseEvent e) { 
     hover = false; 
    } 

    @Override 
    public void mousePressed(MouseEvent e) { 
     click = true; 
    } 

    @Override 
    public void mouseReleased(MouseEvent e) { 
     click = false; 
    } 

    @Override 
    public void mouseClicked(MouseEvent e) {} 
} 

這裏IST主：

package custombutton; 

import java.awt.Color; 

import javax.swing.JFrame; 
import javax.swing.JPanel; 

public class Main extends JFrame { 

    public Main() { 
     JPanel panel = new JPanel(); 

     setTitle("Custom Button"); 

     setSize(400, 100); 
     setResizable(false); 

     panel.setBackground(Color.GRAY); 
     CustomButton button = new CustomButton("Hallo"); 
     panel.add(button); 
     add(panel); 

     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setLocationRelativeTo(null); 
     setVisible(true); 
    } 

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

} 

Answer 1

我認爲這個問題是setButtonText(text);代替它，你應該使用setText(text);