https://www.youtube.com/watch?v=Z_heBwSwPn0&t=1s import java.awt.Color; import java.awt.Font; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; // 버튼입력값 받기 import java.util.ArrayList; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; public class Calculator extends JFrame { private J..
