BorderLayout 이용하여 계산기 만들기

• BorderLayout 이용하여 계산기 만들기
• BorderLayout: North, South, Center, East, West

 

 

package swingTest;
 
import java.awt.BorderLayout;
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.JPanel;
import javax.swing.JTextField;
 
public class CalTest_Border extends JFrame implements ActionListener {
    private JTextField tf1, tf2, tf3;
    
    public CalTest_Border() {
        setTitle("계산기 BorderLayout");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());
        
        JPanel p1=new JPanel();
        JPanel p2=new JPanel();
        JPanel p3=new JPanel();
        
        tf1=new JTextField(5); //숫자 1
        tf2=new JTextField(5); //숫자 2
        tf3=new JTextField(15); //결과
        
        JButton b1=new JButton("+");
        JButton b2=new JButton("-");
        JButton b3=new JButton("*");
        JButton b4=new JButton("/");
        
        p1.add(new JLabel("숫자1"));
        p1.add(tf1);
        p1.add(new JLabel("숫자2"));
        p1.add(tf2);
        p2.add(b1); p2.add(b2); p2.add(b3); p2.add(b4);
        p3.add(new JLabel("결과"));
        p3.add(tf3);
        
        add(BorderLayout.NORTH,p1);
        add(BorderLayout.CENTER,p2);
        add(BorderLayout.SOUTH,p3);
        
        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b4.addActionListener(this);
        
        setSize(400,200);
        setVisible(true);
    }
    
    public static void main(String[] args) {
        new CalTest_Border();
    }
    
    
    @Override
    public void actionPerformed(ActionEvent e) {
        String str=e.getActionCommand();
        try {
        int a= Integer.parseInt(tf1.getText());
        int b= Integer.parseInt(tf2.getText());
        
        switch(str) {
        case "+" : tf3.setText(String.valueOf(a+b)); break;
        case "-" : tf3.setText(a-b+""); break; //문자를 더하면 자동적으로 문자로 바뀜
        case "*" : tf3.setText(a*b+""); break;
        case "/" : tf3.setText(a/b+""); break; 
            }
        }catch (NumberFormatException n) {
            tf3.setText("숫자를 입력하세요");
        }catch (ArithmeticException a) {
            tf3.setText("0으로 나눌 수 없습니다.");
        }
        
    }
    
}