设计一个简单java计算器包括java.awt类和java.swing类,用到数组
时间: 2024-02-22 08:27:50 浏览: 19
好的,下面是一个简单的Java计算器程序,它包括Java AWT和Swing类,并使用了数组。
```java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame implements ActionListener {
private JTextField display;
private JButton[] buttons;
private String[] buttonLabels = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+"};
private double currentVal = 0, previousVal = 0;
private String operator = "";
public Calculator() {
setTitle("Java Calculator");
setSize(300, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
// Create the display field
display = new JTextField();
display.setEditable(false);
display.setHorizontalAlignment(JTextField.RIGHT);
// Create the buttons
buttons = new JButton[buttonLabels.length];
for (int i = 0; i < buttonLabels.length; i++) {
buttons[i] = new JButton(buttonLabels[i]);
buttons[i].addActionListener(this);
}
// Add the components to the content pane
JPanel contentPane = new JPanel(new BorderLayout());
contentPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
contentPane.add(display, BorderLayout.NORTH);
JPanel buttonPanel = new JPanel(new GridLayout(4, 4, 5, 5));
for (int i = 0; i < buttons.length; i++) {
buttonPanel.add(buttons[i]);
}
contentPane.add(buttonPanel, BorderLayout.CENTER);
setContentPane(contentPane);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
String label = e.getActionCommand();
switch (label) {
case "0":
case "1":
case "2":
case "3":
case "4":
case "5":
case "6":
case "7":
case "8":
case "9":
display.setText(display.getText() + label);
break;
case ".":
if (display.getText().indexOf(".") == -1) {
display.setText(display.getText() + ".");
}
break;
case "+":
case "-":
case "*":
case "/":
operator = label;
previousVal = Double.parseDouble(display.getText());
display.setText("");
break;
case "=":
currentVal = Double.parseDouble(display.getText());
switch (operator) {
case "+":
currentVal += previousVal;
break;
case "-":
currentVal = previousVal - currentVal;
break;
case "*":
currentVal *= previousVal;
break;
case "/":
currentVal = previousVal / currentVal;
break;
}
display.setText(Double.toString(currentVal));
break;
}
}
public static void main(String[] args) {
new Calculator();
}
}
```
这个程序使用数组来存储计算器按钮的标签,并使用循环来创建和添加这些按钮。它还使用了两个变量来跟踪先前的值和当前的值,并根据所选操作计算结果。最后,它使用Java AWT和Swing类来创建用户界面。