编程方法

编程方法

面向过程

在一个主函数里面进行所有操作过程

public class TestTextField {

  public static void main(String[] args) {
    Frame frame = new Frame();
        TextField field  = new TextField();
        frame.setLayout(new BorderLayout());
        frame.add(field);
        field.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                TextField field = (TextField)e.getSource();
                System.out.println(field.getText());
                field.setText("");
           }
        });
        
        frame.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
            }
        });
        
        frame.setVisible(true);
        
  }

}

面向对象

在类中构造类，通过调用类方法使主函数简洁

public class TestTextField {

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

class MyFrame extends Frame{
  
  public MyFrame(){
    setLayout(new BorderLayout());
    TextField field = new TextField();
    field.setEchoChar('*');
    field.addActionListener(new TextListener());
    add(field);
    pack();
    setVisible(true);
    addWindowListener(new WindowAdapter(){
      public void windowClosing(WindowEvent e){
        System.exit(0);
      }
    });
  } 
  
}

class TextListener implements ActionListener{

  @Override
  public void actionPerformed(ActionEvent e) {
    TextField field = (TextField)e.getSource();
    System.out.println(field.getText());
    field.setText("");
  }
  
}

内部类

将构造类放在主类当中，方便方法和参数的调用

public class TestTextField {

   public static void main(String[] args) {
      new MyFrame();
   }
    
    private class MyFrame extends Frame{

        public MyFrame(){
            setLayout(new BorderLayout());
            TextField field = new TextField();
            field.setEchoChar('*');
            field.addActionListener(new TextListener());
            add(field);
            pack();
            setVisible(true);
            addWindowListener(new WindowAdapter(){
                public void windowClosing(WindowEvent e){
                    System.exit(0);
                }
            });
        }   
    }
   private class TextListener implements ActionListener{

        @Override
        public void actionPerformed(ActionEvent e) {
            TextField field = (TextField)e.getSource();
            System.out.println(field.getText());
            field.setText("");
        }

    }
}