계산기 프로그램 작성

 

Calc.rar

 

 

import javax.swing.*; import java.awt.*; import java.awt.event.*; public class CalcFrame extends JFrame implements ActionListener, KeyListener {  JTextField text;  JPanel buttonPanel;  JButton numButton[] = new JButton[10];  JButton dotButton, equalButton;  JButton plusButton, minusButton, mulButton, divButton;  JButton clearButton;  String s = "";  double result = 0;  double num = 0;  char operator;    public CalcFrame() {   setTitle("계산기");   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   setVisible(true);   setLayout(new BorderLayout());      text = new JTextField("0");   text.setEditable(false);   buttonPanel = new JPanel();   buttonPanel.setLayout(new GridLayout(0, 4));      for(int i=0; i<10; i++) {    numButton[i] = new JButton("" + i);    numButton[i].addActionListener(this);   }      dotButton = new JButton(".");   equalButton = new JButton("=");   plusButton = new JButton("+");   minusButton= new JButton("-");   mulButton = new JButton("*");   divButton = new JButton("/");   dotButton.addActionListener(this);   equalButton.addActionListener(this);   plusButton.addActionListener(this);   minusButton.addActionListener(this);   mulButton.addActionListener(this);   divButton.addActionListener(this);      buttonPanel.add(numButton[1]);   buttonPanel.add(numButton[2]);   buttonPanel.add(numButton[3]);   buttonPanel.add(plusButton);   buttonPanel.add(numButton[4]);   buttonPanel.add(numButton[5]);   buttonPanel.add(numButton[6]);   buttonPanel.add(minusButton);   buttonPanel.add(numButton[7]);   buttonPanel.add(numButton[8]);   buttonPanel.add(numButton[9]);   buttonPanel.add(mulButton);   buttonPanel.add(dotButton);   buttonPanel.add(numButton[0]);   buttonPanel.add(equalButton);   buttonPanel.add(divButton);      clearButton = new JButton("Clear");   clearButton.addActionListener(this);      add(text, BorderLayout.NORTH);   add(buttonPanel, BorderLayout.CENTER);   add(clearButton, BorderLayout.SOUTH);      addKeyListener(this);   pack();     }  public void actionPerformed(ActionEvent e) {   JButton button = (JButton) e.getSource();      for(int i=0; i<10; i++) {    if(button == numButton[i]) {     s += i;     text.setText(s);    }   }   if(button == dotButton) {    s += ".";    text.setText(s);   }   else if(button == clearButton) {    s = "";    result = 0;    num = 0;    operator = 0;    text.setText("0");   } else if(button == plusButton) {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '+';    System.out.println(result);   } else if(button == minusButton) {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '-';    System.out.println(result);   } else if(button == mulButton) {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '*';    System.out.println(result);   } else if(button == divButton) {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '/';    System.out.println(result);   } else if(button == equalButton) {    if(num == 0)     num = Double.parseDouble(text.getText());    switch(operator) {    case '+':     result += num;     break;    case '-':     result -= num;     break;    case '*':     result *= num;     break;    case '/':     result /= num;     break;    }    text.setText("" + result);    s = "";   }  }    public static void main(String[] args) {   CalcFrame f = new CalcFrame();  }  @Override  public void keyPressed(KeyEvent e) {   char ch = e.getKeyChar();      if(e.getKeyCode() == KeyEvent.VK_ESCAPE) {    s = "";    result = 0;    num = 0;    operator = 0;    text.setText("0");   }      for(int i=0; i<10; i++) {    if(ch == '0' + i) {     s += i;     text.setText(s);    }   }   if(ch == '.') {    s += ".";    text.setText(s);   }   else if(ch == '+') {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '+';    System.out.println(result);   }   else if(ch == '-') {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '-';    System.out.println(result);   } else if(ch == '*') {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '*';    System.out.println(result);   } else if(ch == '/') {    result = Double.parseDouble(text.getText());    text.setText("0");    s = "";    operator = '/';    System.out.println(result);   } else if(ch == '=') {    if(num == 0)     num = Double.parseDouble(text.getText());    switch(operator) {    case '+':     result += num;     break;    case '-':     result -= num;     break;    case '*':     result *= num;     break;    case '/':     result /= num;     break;    }    text.setText("" + result);    s = "";   }  }  @Override  public void keyReleased(KeyEvent e) {   // TODO Auto-generated method stub     }  @Override  public void keyTyped(KeyEvent e) {   // TODO Auto-generated method stub     } }