如何将文本添加到JTextArea？ java

Question

我的程序中有三个按钮和一个JTextArea。我想要做的是，当用户按下按钮时，我希望JTextArea有文本说按钮1被按下，按钮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，当用户按下按钮1，我想JTextArea中有短信说扣1是按，然后如果用户按下按钮2，我想JTextArea中有以前的文本和按钮2的文本。所以它应该说类似的东西;

button 1 was pressed 
button 2 was pressed 

编辑：

等有文字像这样，

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

，如果我有更多的按钮，它看起来像这样

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

将actionListener添加到每个将调用的图片

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

下面是简单的演示

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); 

---

您还可以使用

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"); 

，如果你想在开始添加新线文本区域。

Answer 2

您需要到动作侦听器添加到您的按钮是这样的：

button1.addActionListener(new ActionListener() { 

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

    } 
}); 

不要忘了在类级别声明文本区域。

希望这有助于

Answer 3

在您添加的按钮框架做到这一点：

button.addActionListener（新的ActionListener（）{

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

有关这次访问更出众的细节：http://docs.oracle.com/javase/tutorial/uiswing/events/actionlistener.html