如何將文本添加到JTextArea？ java

Question

我的程序中有三個按鈕和一個JTextArea。我想要做的是，當用戶按下按鈕時，我希望JTextArea有文本說按鈕1被按下，按鈕2被按下等等。例如。

JButton button1 = new JButton(); 
JButton button2 = new JButton(); 
JButton button3 = new JButton(); 

JTextArea text = new JTextArea(); 
JFrame frame = new JFrame(); 
frame.add(button1); 
frame.add(button2); 
frame.add(button3); 
frame.add(text); 
frame.setVisible(true); 

我想要做的是，當用戶按下按鈕1，我想JTextArea中有短信說扣1是按，然後如果用戶按下按鈕2，我想JTextArea中有以前的文本和按鈕2的文本。所以它應該說類似的東西;

button 1 was pressed 
button 2 was pressed 

編輯：

等有文字像這樣，

button 1 was pressed button 2 was pressed 
button 3 was pressed 

，如果我有更多的按鈕，它看起來像這樣

button 1 was pressed button 2 was pressed 
button 3 was pressed button 4 was pressed 
button 5 was pressed button 6 was pressed 

等。

Answer 1

將actionListener添加到每個將調用的圖片

yourTextArea.append("button X was pressed\n"); 

下面是簡單的演示

JFrame frame = new JFrame(); 
frame.setLayout(new FlowLayout()); 

final JTextArea area = new JTextArea(2,20); 
frame.getContentPane().add(area); 

JButton button1 = new JButton("press me"); 
JButton button2 = new JButton("press me"); 

button1.addActionListener(new ActionListener() { 
    public void actionPerformed(ActionEvent e) { 
     area.append("button 1 was pressed\n"); 
    } 
}); 
button2.addActionListener(new ActionListener() { 
    public void actionPerformed(ActionEvent e) { 
     area.append("button 2 was pressed\n"); 
    } 
}); 

frame.getContentPane().add(button1); 
frame.getContentPane().add(button2); 

frame.setSize(300,300); 
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
frame.setVisible(true); 

---

您還可以使用

try { 
    area.getDocument().insertString(0,"button 1 was pressed\n", null); 
} catch (BadLocationException e1) { 
    e1.printStackTrace(); 
} 

，而不是

yourTextArea.append("button X was pressed\n"); 

，如果你想在開始添加新線文本區域。

Answer 2

您需要到動作偵聽器添加到您的按鈕是這樣的：

button1.addActionListener(new ActionListener() { 

    @Override 
    public void actionPerformed(ActionEvent arg0) { 
     textArea.append("button 1 was pressed"); 

    } 
}); 

不要忘了在類級別聲明文本區域。

希望這有助於

Answer 3

在您添加的按鈕框架做到這一點：

button.addActionListener（新的ActionListener（）{

 public void actionPerformed(ActionEvent e) 
     { 
      //Here write what you want to be execute when button is pressed 
     } 
    }); 

有關這次訪問更出衆的細節：http://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html