遇到麻烦实施重置按钮

Question

我想添加一个重置按钮，我已经把关闭程序按钮，但我不知道该怎么做。我只想让它在按下确认按钮之前将当前选项卡恢复到原始状态。

public class A5 extends JPanel { 

public A5() { 
    super(new GridLayout(1, 1)); 
    //creating tabbed pane 
    JTabbedPane tabbedPane = new JTabbedPane(); 
    //calling question 1 tab method 
    JComponent q1 = makeq1panel("Question 1"); 
    q1.setPreferredSize(new Dimension(420, 150)); 
    tabbedPane.addTab("Question 1", q1); 
    add(tabbedPane);  
} 


private JComponent makeq1panel(String question) { 
    //making panel and title for it 
    final JPanel panel = new JPanel(false); 
    panel.setLayout(new GridLayout(3, 1)); 
    JLabel title = new JLabel("Enter a number and press confirm"); 
    title.setHorizontalAlignment(JLabel.CENTER); 
    panel.add(title); 
    //spinner for input 
    int spinnerstart = 1; 
    SpinnerModel number = new SpinnerNumberModel(spinnerstart, spinnerstart - 1, spinnerstart + 50, 1); 
    final JSpinner spin = addSpinner(panel,number); 
    //confirm button 
    JButton btconfirm = new JButton("Confirm"); 
    btconfirm.addActionListener(new ActionListener() 
    { 
     public void actionPerformed(ActionEvent e) 
     { 
      String output = null; 
      //checking if value is correct 
      int inputINT = (Integer)spin.getValue(); 
      if (inputINT <10 && inputINT >1) 
       output = "True"; 
      else output = "False"; 
      //Question output 
      JLabel d2 = new JLabel("Output: " + output); 
      java.awt.Font subfont = new java.awt.Font("Dialog",Font.BOLD,14); 
      d2.setFont(subfont); 
      d2.setHorizontalAlignment(JLabel.CENTER); 
      panel.removeAll(); 
      panel.add(d2); 
      //reset button 
      JButton btclose = new JButton("Close Program"); 
      btclose.addActionListener(new ActionListener() 
      { 
       public void actionPerformed(ActionEvent e) 
       { 
        System.exit(0); 
       } 
      }); 
      //adding close button and refreshing 
      panel.add(btclose); 
      revalidate(); 
      repaint(); 
     } 
    }); 
    panel.add(btconfirm); 
    return panel; 
} 



private static void makewindow() { 
    //Create and set up the window. 
    JFrame frame = new JFrame("Assignment 5"); 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    //Add content to the window. 
    frame.add(new A5(), BorderLayout.CENTER); 
    //Display the window. 
    frame.pack(); 
    frame.setVisible(true); 
} 

static protected JSpinner addSpinner(Container c, SpinnerModel model) { 
    JSpinner spinner = new JSpinner(model); 
    c.add(spinner); 

    return spinner; 
} 

public static void main(String[] args) { 
    //run it 
    SwingUtilities.invokeLater(new Runnable() { 
     public void run() { 
      makewindow(); 
     } 
    }); 
} 
} 

Answer 1

执行System.exit(0);声明你的程序将被终止以及JVM，所以操作不会在此声明后继续后。