import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

class Calculator extends JFrame {

public Calculator(String title) {

// this없어도됨

setTitle(title);

// size설정(width,height)

setSize(230, 400);

setLocation(800, 300);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel jp1 = new JPanel();

JPanel jp2 = new JPanel();

JPanel

jp3 = new JPanel();

this.add(jp1);

jp1.setLayout(new FlowLayout());

jp2.setLayout(new GridLayout(4, 4));

jp2.setPreferredSize(new Dimension(220, 220));

JButton b1 = new JButton("1");

jp2.add(b1);

JButton b2 = new JButton("2");

jp2.add(b2);

JButton b3 = new JButton("3");

jp2.add(b3);

JButton bminer = new JButton("-");

jp2.add(bminer);

JButton b4 = new JButton("4");

jp2.add(b4);

JButton b5 = new JButton("5");

jp2.add(b5);

JButton b6 = new JButton("6");

jp2.add(b6);

JButton bplus = new JButton("+");

jp2.add(bplus);

JButton b7 = new JButton("7");

jp2.add(b7);

JButton b8 = new JButton("8");

jp2.add(b8);

JButton b9 = new JButton("9");

jp2.add(b9);

JButton bgob = new JButton("*");

jp2.add(bgob);

JButton b0 = new JButton("0");

jp2.add(b0);

JButton bdot = new JButton(".");

jp2.add(bdot);

JButton beq = new JButton("=");

jp2.add(beq);

JButton bna = new JButton("/");

jp2.add(bna);

jp3.setLayout(new FlowLayout(FlowLayout.RIGHT));

jp3.setPreferredSize(new Dimension(220, 100));

JLabel text1 = new JLabel("만든이 : ㅁㄴㅇ");

JLabel text2 = new JLabel("eMail : ㅁㄴㅇ@naver.com");

jp3.add(text1);

jp3.add(text2);

JButton Clear = new JButton("Clear");

Clear.setPreferredSize(new Dimension(220, 30));

JLabel idlbl = new JLabel("Swing으로 구현한 계산기");

jp1.add(idlbl);

JTextField idtf = new JTextField(24);

jp1.add(idtf);

jp1.add(jp2);

jp1.add(Clear);

jp1.add(jp3);

this.setVisible(true);

}

public static void main(String[] args) { //인수로 넣음 new Calculator("계산기"); }

new Calculator("계산기");

}

}