import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;

public class ClickCalculator extends JFrame implements ActionListener {
   private static final long serialVersionUID = 1L;
  
       JButton btn1 = new JButton("1");
       JButton btn2 = new JButton("2");
       JButton btn3 = new JButton("3");
       JButton btn4 = new JButton("4");
       JButton btn5 = new JButton("5");
       JButton btn6 = new JButton("6");
       JButton btn7 = new JButton("7");
       JButton btn8 = new JButton("8");
       JButton btn9 = new JButton("9");
       JButton btn10 = new JButton("0");
       JButton btn11 = new JButton("C");
       JButton btn12 = new JButton("=");
       JButton btn13 = new JButton("+");
       JButton btn14 = new JButton("-");
       JButton btn15 = new JButton("/");
       JButton btn16 = new JButton("*");
      
       JLabel display = new JLabel();
      
  
  
   public ClickCalculator() {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setSize(400,200);
      makePanel();
      setVisible(true);
        
     
     
   }
  
   public void makePanel() {
          JPanel p1 = new JPanel();
          p1.setSize(500,50);
          JPanel p2 = new JPanel(new GridLayout(4,4));
           p2.add(btn1);
            p2.add(btn2);
            p2.add(btn3);
            p2.add(btn4);
            p2.add(btn5);
            p2.add(btn6);
            p2.add(btn7);
            p2.add(btn8);
            p2.add(btn9);
            p2.add(btn10);
            p2.add(btn11);
            p2.add(btn12);
            p2.add(btn13);
            p2.add(btn14);
            p2.add(btn15);
            p2.add(btn16);
            add(p1, BorderLayout.CENTER);
            p1.add(display);
            add(p2, BorderLayout.SOUTH);
  
            btn1.addActionListener(this);
            btn2.addActionListener(this);
            btn3.addActionListener(this);
            btn4.addActionListener(this);
            btn5.addActionListener(this);
            btn6.addActionListener(this);
            btn7.addActionListener(this);
            btn8.addActionListener(this);
            btn9.addActionListener(this);
            btn10.addActionListener(this);
            btn11.addActionListener(this);
            btn12.addActionListener(this);
            btn13.addActionListener(this);
            btn14.addActionListener(this);
            btn15.addActionListener(this);
            btn16.addActionListener(this);
   }

  
   public void actionPerformed(ActionEvent e) {
      String str = e.getActionCommand();
     
   }
  
   public static void main(String[] args) {
      // TODO Auto-generated method stub
      ClickCalculator cc = new ClickCalculator();
      cc.setTitle("누르는 계산기");
      cc.makePanel();
   }
  
}

 

 

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같은게 안떠서 입력이 안되네요...

 

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