10월 12일 강의내용

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class SwingApplication extends JFrame implements ActionListener{
     public static final int WIDTH = 300;
     public static final int HEIGHT = 200;
     JPanel panel;
     JButton confirmButton, exitButton;
 
 
 public SwingApplication(){
      this.setTitle("Swing Application");
      setSize(WIDTH,HEIGHT);
  
      setDefaultCloseOperation(EXIT_ON_CLOSE);
  
      confirmButton = new JButton("확인");
  
      exitButton = new JButton("프로그램 종료");
      exitButton.addActionListener(this);
  
      panel = new JPanel();
  
      panel.add(confirmButton);
      panel.add(exitButton);
      this.add(panel);
  
      setVisible(true);
 }

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

 }

 @Override
 public void actionPerformed(ActionEvent arg0) {
  System.exit(0);
  
 }
}
* 프로그램 종료 버튼을 눌렀을때 꺼지는 기능은   button.addActionListener(this);

ActionListener = 프로그램 종료 (하나의 약속)

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

 

*레이아웃 넣기

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class SwingApplication extends JFrame implements ActionListener{
     public static final int WIDTH = 300;
     public static final int HEIGHT = 200;
     JPanel panel;
     JButton confirmButton, exitButton;
 
 public SwingApplication(){
      this.setTitle("Swing Application");
      setSize(WIDTH,HEIGHT);
  
      setLayout(new BorderLayout());
  
      setDefaultCloseOperation(EXIT_ON_CLOSE);
  
      confirmButton = new JButton("확인");
   
  
      exitButton = new JButton("프로그램 종료");
      exitButton.addActionListener(this);
  
      panel = new JPanel();
  
      panel.add(confirmButton);
 
      panel.add(exitButton);
      this.add(panel, BorderLayout.SOUTH);
  
      setVisible(true);
 }

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

 }

 @Override
 public void actionPerformed(ActionEvent arg0) {
      System.exit(0);
  
 }
}

 

//////////////////////////////////////////////////////////////////////////////////////////////////////////////

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class SwingApplication extends JFrame implements ActionListener{
     public static final int WIDTH = 300;
     public static final int HEIGHT = 200;
     JPanel panel;
     JButton confirmButton, exitButton;
 
 public SwingApplication(){
      this.setTitle("Swing Application");
      setSize(WIDTH,HEIGHT);
 
      setLayout(new BorderLayout());
 
      setDefaultCloseOperation(EXIT_ON_CLOSE);
 
      confirmButton = new JButton("확인");
      confirmButton.addActionListener(this);
  
 
      exitButton = new JButton("종료");
      exitButton.addActionListener(this);
 
      panel = new JPanel();
 
      panel.add(confirmButton);
 
      panel.add(exitButton);
      this.add(panel, BorderLayout.SOUTH);
 
      setVisible(true);
 }

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

 }

 @Override
 public void actionPerformed(ActionEvent e) {
  JButton b = (JButton)e.getSource();
  if (b.getText().equals("확인")){
   b.setText("취소");
  } else if (b.getText() == "종료"){
 System.exit(0);
 
    }
  }
}