java计算器程序代码gui
时间: 2023-11-21 07:59:21 浏览: 32
以下是一个简单的Java计算器GUI程序代码,它可以通过按钮事件和键盘事件进行运算:
```java
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener, KeyListener {
private JTextField display;
private JButton[] buttons;
private String[] labels = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+"};
private int[] widths = {100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 200, 100, 100, 100};
private int[] heights = {100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100};
private double result = 0;
private String operator = "=";
private boolean startOfNumber = true;
public Calculator() {
super("Calculator");
display = new JTextField("", 12);
display.setHorizontalAlignment(JTextField.RIGHT);
display.setEditable(false);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));
buttons = new JButton[16];
for (int i = 0; i < 16; i++) {
buttons[i] = new JButton(labels[i]);
buttons[i].addActionListener(this);
buttons[i].addKeyListener(this);
buttons[i].setPreferredSize(new Dimension(widths[i], heights[i]));
panel.add(buttons[i]);
}
getContentPane().add(display, BorderLayout.NORTH);
getContentPane().add(panel, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (command.charAt(0) >= '0' && command.charAt(0) <= '9' || command.equals(".")) {
if (startOfNumber == true) {
display.setText(command);
} else {
display.setText(display.getText() + command);
}
startOfNumber = false;
} else {
if (startOfNumber) {
if (command.equals("-")) {
display.setText(command);
startOfNumber = false;
} else {
operator = command;
}
} else {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = command;
startOfNumber = true;
}
}
}
public void keyTyped(KeyEvent e) {
char keyChar = e.getKeyChar();
if (keyChar >= '0' && keyChar <= '9' || keyChar == '.') {
if (startOfNumber == true) {
display.setText("" + keyChar);
} else {
display.setText(display.getText() + keyChar);
}
startOfNumber = false;
} else if (keyChar == '+' || keyChar == '-' || keyChar == '*' || keyChar == '/') {
if (startOfNumber) {
if (keyChar == '-') {
display.setText("" + keyChar);
startOfNumber = false;
} else {
operator = "" + keyChar;
}
} else {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = "" + keyChar;
startOfNumber = true;
}
} else if (keyChar == '\n') {
double x = Double.parseDouble(display.getText());
calculate(x);
operator = "=";
startOfNumber = true;
} else if (keyChar == '\b') {
String text = display.getText();
if (text.length() > 0) {
text = text.substring(0, text.length() - 1);
if (text.length() == 0) {
display.setText("");
startOfNumber = true;
} else {
display.setText(text);
startOfNumber = false;
}
}
}
}
public void keyPressed(KeyEvent e) {
}
public void keyReleased(KeyEvent e) {
}
private void calculate(double n) {
if (operator.equals("+")) {
result += n;
} else if (operator.equals("-")) {
result -= n;
} else if (operator.equals("*")) {
result *= n;
} else if (operator.equals("/")) {
result /= n;
} else if (operator.equals("=")) {
result = n;
}
display.setText("" + result);
}
public static void main(String[] args) {
Calculator calculator = new Calculator();
}
}
```