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| 자바예제모음 |
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[1] |
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등록일:2008-04-15 16:45:08  (0%)
작성자:
제목:자바 공학용 계산기 코드 |
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Image size : 298 Ⅹ 198
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
class QuestionThree extends Frame implements ActionListener, KeyListener {
final int PREV_PUSH_NUMBER = 0;
final int PREV_PUSH_OPERATOR = 1;
final int PREV_PUSH_EQUAL = 2;
JTextField resultBox, memoryState; // 결과창과 메모리상태창
Button[] calcButton;
boolean isBelowZero; // 현재 소수점 밑인지 아닌지 플래그
double number, result; // 연산에 쓰이는 두 변수
double memory; // 메모리 변수
int zeroLocation; // 소숫점이 찍힌 자리수
char preOperator; // 이전에 누른 연산자 버퍼
int checkStatus; // 이전에 무엇을 수행했는지 기억하는 변수
final Color BACKGROUND = new Color(192, 192, 192);
public QuestionThree(String title) {
super(title);
setSize(300, 200);
setBackground(BACKGROUND);
setLayout(new BorderLayout());
resultBox = new JTextField("0.");
resultBox.setHorizontalAlignment(JTextField.RIGHT);
resultBox.setEnabled(false);
resultBox.addKeyListener(this);
add(resultBox, BorderLayout.NORTH);
memoryState = new JTextField();
memoryState.setEnabled(false);
memoryState.setFont(new Font("Dialog", Font.BOLD, 20));
memoryState.setHorizontalAlignment(JTextField.CENTER); // 정렬상태
calcButton = new Button[24];
for (int i = 0; i < 24; i++) {
calcButton[i] = new Button();
calcButton[i].setFont(new Font("Dialog", Font.PLAIN, 14));
calcButton[i].addActionListener(this);
calcButton[i].addKeyListener(this);
}
calcButton[0].setLabel("Back");
calcButton[1].setLabel("CE");
calcButton[2].setLabel("C");
calcButton[3].setLabel("=");
calcButton[4].setLabel("MC");
calcButton[5].setLabel("7");
calcButton[6].setLabel("8");
calcButton[7].setLabel("9");
calcButton[8].setLabel("/");
calcButton[9].setLabel("MR");
calcButton[10].setLabel("4");
calcButton[11].setLabel("5");
calcButton[12].setLabel("6");
calcButton[13].setLabel("*");
calcButton[14].setLabel("MS");
calcButton[15].setLabel("1");
calcButton[16].setLabel("2");
calcButton[17].setLabel("3");
calcButton[18].setLabel("-");
calcButton[19].setLabel("M+");
calcButton[20].setLabel("0");
calcButton[21].setLabel("+/-");
calcButton[22].setLabel(".");
calcButton[23].setLabel("+");
addKeyListener(this);
Panel p = new Panel();
p.setLayout(new GridLayout(5, 5, 5, 5));
p.addKeyListener(this);
p.add(memoryState);
for (int i = 0; i < 24; i++) {
p.add(calcButton[i]);
}
add(p, BorderLayout.CENTER);
addWindowListener(new windowAdapter());
buttonC(); // 계산기 시작할때 자동으로 C버튼을 눌러 초기화
calcButton[2].requestFocus();
}
class windowAdapter extends WindowAdapter {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
public void keyPressed(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
int pushKey = (int) e.getKeyChar();
char pushChar = e.getKeyChar();
if (pushKey >= 0x30 && pushKey <= 0x39) {
buttonNumber(pushKey - 0x30);
} else {
switch (pushChar) {
case '+':
calculate("+");
break;
case '-':
calculate("-");
break;
case '*':
calculate("*");
break;
case '/':
calculate("/");
break;
case '=':
calculate("=");
break;
case '.': // .
isBelowZero = true;
break;
case 'C':
case 'c':
buttonC();
break;
}
}
}
public void buttonNumber(int pushNumber) {
// 이전에 숫자를 누르지 않았다면 창을 지워준다.
switch (checkStatus) {
case PREV_PUSH_OPERATOR:
buttonCE();
break;
case PREV_PUSH_EQUAL:
buttonC();
break;
}
String prevString = resultBox.getText();
if (isBelowZero)
resultBox.setText(prevString + String.valueOf(pushNumber));
else {
if (prevString.charAt(0) == '0') {
resultBox.setText(String.valueOf(pushNumber)
+ prevString.substring(1));
} else {
String before = prevString.substring(0, zeroLocation);
String after = prevString.substring(zeroLocation);
resultBox.setText(before + String.valueOf(pushNumber) + after);
zeroLocation++;
}
}
checkStatus = PREV_PUSH_NUMBER;
}
public void calculate(String strPushOperator) {
char pushOperator = strPushOperator.charAt(0);
number = Double.parseDouble(resultBox.getText());
switch (preOperator) {
case '+':
result += number;
break;
case '-':
result -= number;
break;
case '*':
result *= number;
break;
case '/':
result /= number;
break;
default:
result = number;
break;
}
String resultText = String.valueOf(result);
// 결과 출력시 끝이 .0이면 마지막 0을 지워준다.
if ((resultText.length() - 2) == resultText.indexOf(".")) {
if (resultText.charAt(resultText.length() - 1) == '0') {
resultText = resultText.substring(0, resultText.length() - 1);
}
}
resultBox.setText(resultText);
preOperator = pushOperator;
if (pushOperator == '=')
checkStatus = PREV_PUSH_EQUAL;
else
checkStatus = PREV_PUSH_OPERATOR;
}
public void buttonC() {
isBelowZero = false;
number = 0;
result = 0;
preOperator = ' ';
zeroLocation = 1;
resultBox.setText("0.");
checkStatus = PREV_PUSH_NUMBER;
}
public void buttonCE() {
resultBox.setText("0.");
isBelowZero = false;
zeroLocation = 1;
}
public void memoryProcess(char delimeter) {
switch (delimeter) {
case 'S':
memory = Double.parseDouble(resultBox.getText());
memoryState.setText("M");
break;
case 'R':
resultBox.setText(String.valueOf(memory));
String resultText = resultBox.getText();
if ((resultText.length() - 2) == resultText.indexOf(".")) {
if (resultText.charAt(resultText.length() - 1) == '0') {
resultBox.setText(resultText.substring(0, resultText
.length() - 1));
}
}
break;
case 'C':
memory = 0;
memoryState.setText("");
break;
case '+':
memory += Double.parseDouble(resultBox.getText());
memoryState.setText("M");
break;
}
}
public void backSpace() {
String resultText = resultBox.getText();
// Backspace는 이전에 숫자가 눌렀을 경우만 가능하게 해야 한다.
if (checkStatus == PREV_PUSH_NUMBER) {
if (isBelowZero) // 소숫점 이하가 표기되어있을 경우
{
int len = resultText.length();
resultText = resultText.substring(0, len - 1);
resultBox.setText(resultText);
if (resultText.charAt(len - 2) == '.')
isBelowZero = false;
} else // 소숫점이하가 표기되어있지 않을 경우
{
int len = resultText.length();
resultText = resultText.substring(0, len - 2) + ".";
zeroLocation--;
resultBox.setText(resultText);
}
if (resultText.length() == 1) {
buttonCE();
}
}
}
public void changeAbs() {
String resultText = resultBox.getText();
if (checkStatus == PREV_PUSH_NUMBER) {
if (resultText.charAt(0) == '-') {
resultText = resultText.substring(1);
} else {
resultText = "-" + resultText;
}
resultBox.setText(resultText);
}
}
public void actionPerformed(ActionEvent e) {
String targetLabel = ((Button) e.getSource()).getLabel();
try {
if (Integer.parseInt(targetLabel) > 0 || targetLabel.equals("0")) {
buttonNumber(Integer.parseInt(targetLabel));
return;
}
} catch (NumberFormatException ne) {
}
;
if (targetLabel.equals("CE"))
buttonCE();
if (targetLabel.equals("C"))
buttonC();
if (targetLabel.equals("."))
isBelowZero = true;
if (targetLabel.equals("+") || targetLabel.equals("-")
|| targetLabel.equals("*") || targetLabel.equals("/")
|| targetLabel.equals("="))
calculate(targetLabel);
if (targetLabel.charAt(0) == 'M')
memoryProcess(targetLabel.charAt(1));
if (targetLabel.charAt(0) == 'B') // Backspace button
backSpace();
if (targetLabel.equals("+/-"))
changeAbs();
}
public static void main(String[] args) {
QuestionThree qt = new QuestionThree("Question Three");
qt.show();
}
} |
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[본문링크] 자바 공학용 계산기 코드
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코멘트(이글의 트랙백 주소:/cafe/tb_receive.php?no=7408 |
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