Calculator I
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import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.math.BigDecimal;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
//==========================
// Swing 계산기
// @Author 원강민
//==========================
public class JCalculator
{
private JFrame frame;
private ActionListener btnClickListener;
/** 결과값 변수 */
private BigDecimal resultValue;
/** 현재 입력된 값을 저장해 놓는 변수 */
private BigDecimal memoryValue;
/** 기존 표기된 내용을 지우고 새로 입력할지 여부 */
private Boolean isNewValue;
/** 현재 선택된 연산 버튼 */
private JButton selectedOperBtn;
private static final String divideErrorText = "0으로 나눌 수 없습니다.";
private Font buttonFont;
private Container container;
private JTextField txt;
private JLabel mLabel;
private JButton plusBtn;
private JButton minusBtn;
private JButton multBtn;
private JButton divBtn;
private JButton enterBtn;
//=============================
//
// Start Point
//
//=============================
public void create()
{
this.init();
this.createUI();
this.setEventListener();
}
//=============================
//
// Private Methods
//
//=============================
/** 초기화 */
private void init()
{
this.buttonFont = new Font("Arial", 0, 16);
this.resultValue = new BigDecimal(0);
this.memoryValue = new BigDecimal(0);
this.selectedOperBtn = null;
this.isNewValue = true;
// 버튼 클릭 리스너
this.btnClickListener = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String txtValue = txt.getText();
JButton b = (JButton) e.getSource();
String _name = b.getText();
switch(_name)
{
case "M+":
if(txtValue.equals(divideErrorText)) return;
mLabel.setVisible(true);
memoryValue = memoryValue.add(new BigDecimal(Float.valueOf(txtValue)));
isNewValue = true;
break;
case "M-":
if(txtValue.equals(divideErrorText)) return;
mLabel.setVisible(true);
memoryValue = memoryValue.subtract(new BigDecimal(Float.valueOf(txtValue)));
isNewValue = true;
break;
case "MR":
Float f = memoryValue.floatValue();
Integer i = memoryValue.intValue();
if(f.equals(Float.valueOf(i))) txt.setText(String.valueOf(i));
else txt.setText(String.valueOf(f));
isNewValue = true;
break;
case "MC":
mLabel.setVisible(false);
memoryValue = new BigDecimal(0);
isNewValue = true;
break;
case "/":
case "*":
case "+":
case "-":
inputOperate(b);
break;
case "←":
inputBackspace();
break;
case "√":
calculateSquareRoot();
break;
case "=":
inputEnter();
break;
case "C":
inputEscape();
break;
default:
pressNumberPad(_name);
break;
}
}
};
}
/** UI 생성 */
private void createUI()
{
frame = new JFrame("JButton Test");
container = new Container();
frame.getContentPane().add(container);
this.mLabel = new JLabel();
this.mLabel.setText("M");
this.mLabel.setBounds(5, 12, 20, 20);
this.mLabel.setVisible(false);
container.add(this.mLabel);
// result text field
txt = new JTextField();
txt.setBorder(null);
txt.setText("0");
txt.setHorizontalAlignment(JTextField.RIGHT);
txt.setBounds(25, 0, 215, 40);
txt.setFocusable(false);
txt.setEditable(false);
container.add(txt);
// functions for memory
int _scaleNum = 60;
createButton("MC", 0, 40, _scaleNum, 40);
createButton("MR", _scaleNum + 6, 40, _scaleNum, 40);
createButton("M+", _scaleNum * 2 + 12, 40, _scaleNum, 40);
createButton("M-", _scaleNum * 3 + 18, 40, _scaleNum, 40);
// number
ArrayList<Character> types = new ArrayList<Character>();
types.add('7'); types.add('8'); types.add('9');
types.add('4'); types.add('5'); types.add('6');
types.add('1'); types.add('2'); types.add('3');
types.add('0'); types.add('.'); types.add('C');
for(int i = 0; i < 4; i++)
{
for(int j = 0; j < 3; j++)
{
String _name = String.valueOf(types.remove(0));
createButton(_name, 9 + j * _scaleNum, 130 + (i * _scaleNum), _scaleNum, _scaleNum);
}
}
// operator
divBtn = createButton("/", 0, 80, _scaleNum, 43);
multBtn = createButton("*", _scaleNum + 6, 80, _scaleNum, 43);
minusBtn = createButton("-", _scaleNum * 2 + 12, 80, _scaleNum, 43);
plusBtn = createButton("+", _scaleNum * 3 + 18, 80, _scaleNum, 43);
enterBtn = createButton("=", _scaleNum * 3 + 18, 246, _scaleNum, 124);
createButton("←", _scaleNum * 3 + 18, 123 + 6, _scaleNum, 55);
createButton("√", _scaleNum * 3 + 18, 178 + 10, _scaleNum, 55);
frame.pack();
frame.setSize(274,408);
frame.setVisible(true);
}
/** 버튼 생성 */
private JButton createButton(String name, int x, int y, int width, int height)
{
JButton btn = new JButton(name);
btn.setName(name);
btn.setBounds(x, y, width, height);
btn.setFocusable(false);
btn.setFont(this.buttonFont);
btn.addActionListener(this.btnClickListener);
this.container.add(btn);
return btn;
}
/** 이벤트 리스너 설정 */
private void setEventListener()
{
this.frame.addKeyListener(new KeyListener()
{
@Override
public void keyTyped(KeyEvent e)
{
Integer code = Integer.valueOf(e.getKeyChar());
if(code >= 48 && code <= 57) pressNumberPad(String.valueOf(e.getKeyChar()));
else if(code == 43) inputOperate(plusBtn);
else if(code == 45) inputOperate(minusBtn);
else if(code == 42) inputOperate(multBtn);
else if(code == 47) inputOperate(divBtn);
else if(code == 10) inputEnter();// Enter(=Return)
else if(code == 27) inputEscape();// Esc
else if(code == 8) inputBackspace();// Backspace
}
@Override
public void keyReleased(KeyEvent e) {}
@Override
public void keyPressed(KeyEvent e) {}
});
}
/** 키패드 입력 */
private void pressNumberPad(String numStr)
{
String txtValue = txt.getText();
if(isNewValue == true)
{
if(selectedOperBtn != null) selectedOperBtn.setForeground(Color.red);
txt.setText("");
isNewValue = false;
}
txtValue = txt.getText();
if(txtValue.equals("0"))
{
txt.setText("");
txtValue = "";
}
txt.setText(txtValue + numStr);
// 적용 후 새로운 value
if(txt.getText().equals(".")) txt.setText("0.");
}
/** 연산자 입력 */
private void inputOperate(JButton b)
{
String txtValue = txt.getText();
if(txtValue.equals(divideErrorText)) return;
if(isNewValue == false) calculate();
if(selectedOperBtn != null) selectedOperBtn.setForeground(Color.black);
b.setForeground(Color.red);
selectedOperBtn = b;
}
/** Square Root 계산 */
private void calculateSquareRoot()
{
Float fValue = Float.valueOf(txt.getText());
BigDecimal tmp = new BigDecimal(Math.sqrt(fValue));
Float f = tmp.floatValue();
Integer i = tmp.intValue();
if(f.equals(Float.valueOf(i))) txt.setText(String.valueOf(i));
else txt.setText(String.valueOf(f));
this.isNewValue = true;
}
/** 엔터 입력 (결과 계산) */
private void inputEnter()
{
String txtValue = txt.getText();
if(txtValue.equals(divideErrorText)) return;
calculate();
if(selectedOperBtn != null) selectedOperBtn.setForeground(Color.black);
}
/** Esc 입력 (초기화) */
private void inputEscape()
{
txt.setText("0");
resultValue = new BigDecimal(0);
if(selectedOperBtn != null) selectedOperBtn.setForeground(Color.black);
selectedOperBtn = null;
}
/** 백스페이스 입력 (마지막 입력값 삭제) */
private void inputBackspace()
{
String txtValue = txt.getText();
txt.setText(txtValue.substring(0, txtValue.length() - 1));
if(txt.getText().equals("")) txt.setText("0");
}
/** 계산하기 */
private void calculate()
{
Float fValue = Float.valueOf(txt.getText());
if(selectedOperBtn == null)
{
resultValue = new BigDecimal(fValue);
isNewValue = true;
return;
}
switch(selectedOperBtn.getName())
{
case "/":
if(txt.getText().equals("0") || txt.getText().equals("0."))
{
this.txt.setText(this.divideErrorText );
if(this.selectedOperBtn != null) this.selectedOperBtn.setForeground(Color.black);
this.selectedOperBtn = null;
this.isNewValue = true;
this.resultValue = new BigDecimal(0);
return;
}
resultValue = resultValue.divide(new BigDecimal(fValue));
break;
case "*":
resultValue = resultValue.multiply(new BigDecimal(fValue));
break;
case "+":
resultValue = resultValue.add(new BigDecimal(fValue));
break;
case "-":
resultValue = resultValue.subtract(new BigDecimal(fValue));
break;
}
Float f = resultValue.floatValue();
Integer i = resultValue.intValue();
if(f.equals(Float.valueOf(i))) txt.setText(String.valueOf(i));
else txt.setText(String.valueOf(f));
isNewValue = true;
}
/** 콘솔에 출력하기 */
private void trace(String value)
{
System.out.println(value);
}
/** main 함수 */
public static void main(String[] args)
{
new JCalculator().create();
}
}
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