JButton被点击时如何获取到JTextField中的内容

[GodisaAVman]

当点击JButton时如何获取到JTextField中的内容

[jdgdf566]

先把界面放着，先学别的，最后学界面。

[BoyAndGirl_hello]

添加按钮响应事件 继承接口 ActionListener然后实现actionPerformed方法 { 文本框.getText() }

[小指一抖内存泄漏]

JTextField  jtf = new JTextField("");
//添加监听器
jtf.geDocument().addDocumentListener(DocumentTestListener e);
class DocumentTestListener implements DocumentListener
	{
		public void insertUpdate(DocumentEvent e)
		{
			jtf.getText();
		}
		public void removeUpdate(DocumentEvent e)
		{
			jtf.getText();
		}
		public void changedUpdate(DocumentEvent e)
		{
			//nothing
		}
	}

[阿凡驴子]

3楼正解~~~~~~~~~~

[小指一抖内存泄漏]

按钮的话，实现ActionListener监听器接口就可以了，上面我写的多余了

[GodisaAVman]

上代码 public static void main(String[] args) { JFrame jFrame = new JFrame(); JPanel jPanel = new JPanel(); jPanel.setLayout(new FlowLayout()); jFrame.setSize(400, 300); Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); Dimension frameSize = jFrame.getSize(); // textarea sets JTextArea textArea = new JTextArea(); textArea.setText("是否关机"); Font font = new Font("textFont", Font.BOLD, 90); textArea.setSize(frameSize.width, frameSize.height / 2); textArea.setFont(font); jPanel.add(textArea); // JButton JButton button_Y = new JButton("是"); JButton button_N = new JButton("否"); button_Y.setFont(new Font("button_Y", Font.BOLD, 40)); button_N.setFont(new Font("button_Y", Font.BOLD, 40)); button_Y.setPreferredSize(new Dimension(180, 70)); button_N.setPreferredSize(new Dimension(180, 70)); button_N.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.exit(0); } }); jPanel.add(button_Y); jPanel.add(button_N); // 关机延时时间 JTextArea textArea_ = new JTextArea("关机延时时间:"); textArea_.setFont(new Font("text_", Font.BOLD, 20)); jPanel.add(textArea_); // inputText JTextField delayTime = new JTextField("100"); delayTime.setPreferredSize(new Dimension(50, 30)); jPanel.add(delayTime); // 秒 JTextArea textArea_1 = new JTextArea("秒"); textArea_1.setFont(new Font("text_1", Font.BOLD, 20)); jPanel.add(textArea_1); // frame sets jFrame.add(jPanel); jFrame.setVisible(true); jFrame.setTitle("关机"); jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); delay = Integer.parseInt(delayTime.getText().trim()); button_Y.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { Runtime.getRuntime().exec("shutdown -s -t " + delay); } catch (IOException e1) { e1.printStackTrace(); } } }); jFrame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2); }