如何退出方法的ActionListener

Question

我有連接到JTextField的ActionListener，想輸入的東西，這樣它會退出方法ActionListener是

代碼：

main() { 
    Security(x,x,x); 
} 
public void Security(JTextArea out, JTextField in) { 
     in.setText(""); 
     in.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent ae) { 
       if (in.getText().contains("exitsys")) { 
        out.append("Security:Security System Deactivated\n"); 
        return; 
       } 
       in.setText(""); 
      } 
     }); 
     out.append("Security:Security System Activated\n"); 
     fileWrite(":SYSTEM_INITIATED@" + time(), out); 
    } 

我想鍵入"exitsys"並返回到主類方法"main()"。

fileWrite方法使用PrintWriter來輸出數據。

問題概要：我嘗試調用return;但它不返回到main（）方法，我該如何解決這個問題？

Answer 1

基本上你需要的是某種模態對話框，它可以讓你有效地停止程序的執行，直到對話框關閉爲止，執行結束繼續...

import java.awt.EventQueue; 
import java.awt.GridBagLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JDialog; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 
import javax.swing.SwingUtilities; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 

public class Test { 

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

    public Test() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
        ex.printStackTrace(); 
       } 

       JDialog dialog = new JDialog(); 
       dialog.setTitle("Testing"); 
       dialog.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
       dialog.add(new TestPane()); 
       dialog.pack(); 
       dialog.setLocationRelativeTo(null); 
       dialog.setVisible(true); 

       System.out.println("Now back in the main..."); 
      } 
     }); 
    } 

    public class TestPane extends JPanel { 

     private JTextField field; 

     public TestPane() { 

      setLayout(new GridBagLayout()); 

      field = new JTextField(10); 
      field.addActionListener(new ActionListener() { 

       @Override 
       public void actionPerformed(ActionEvent e) { 
        if ("exitsys".equals(field.getText())) { 
         SwingUtilities.getWindowAncestor(field).dispose(); 
        } 
       } 
      }); 

      add(field); 

     } 

    } 

} 

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