CalTest 클래스를 복사하여 내부 클래스로 나타내기 (CalTest2)

• CalTest 클래스를 복사하여 내부 클래스로 나타내기 (CalTest2) (Anonymous Inner Type 연습. 중복된 코드는 많으나 객체와 이벤트를 붙임으로써 명료해진다.)

 

package swingTest;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class CalTest2 extends JFrame {
     private JTextField tf1, tf2, tf3;
     
     public CalTest2() {
          setTitle("계산기2");
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setLayout(new FlowLayout());
          tf1=new JTextField(5); //숫자 1
          tf2=new JTextField(5); //숫자 2
          tf3=new JTextField(20); //결과
          
          JButton b1=new JButton("+");
          JButton b2=new JButton("-");
          JButton b3=new JButton("*");
          JButton b4=new JButton("/");
          
          b1.addActionListener(new ActionListener() {
              public void actionPerformed(ActionEvent e) {
                   int a= Integer.parseInt(tf1.getText());
                   int b= Integer.parseInt(tf2.getText());
                   tf3.setText(a+b+"");
              }
          });
          b2.addActionListener(new ActionListener() {
              public void actionPerformed(ActionEvent e) {
                   int a= Integer.parseInt(tf1.getText());
                   int b= Integer.parseInt(tf2.getText());
                   tf3.setText(a-b+"");
              }
          });
          b3.addActionListener(new ActionListener() {
              public void actionPerformed(ActionEvent e) {
                   int a= Integer.parseInt(tf1.getText());
                   int b= Integer.parseInt(tf2.getText());
                   tf3.setText(a*b+"");
              }
          });
          b4.addActionListener(new ActionListener() {
              public void actionPerformed(ActionEvent e) {
                   int a= Integer.parseInt(tf1.getText());
                   int b= Integer.parseInt(tf2.getText());
                   tf3.setText(a/b+"");
              }
          });
          
          add(new JLabel("숫자1"));
          add(tf1);
          add(new JLabel("숫자2"));
          add(tf2);
          add(b1); add(b2); add(b3); add(b4);
          add(new JLabel("결과"));
          add(tf3);
          
          setSize(700,100);
          setVisible(true);
     }
     
     public static void main(String[] args) {
          new CalTest2();
     }
}