java gui 设计一个文本框输入量数字实现四则运算
时间: 2024-02-28 21:51:59 浏览: 20
好的,下面是一个简单的Java GUI程序,可以实现文本框输入数字和四则运算功能:
```java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class CalculatorGUI extends JFrame implements ActionListener {
private JTextField num1Field, num2Field, resultField;
private JButton addButton, subButton, mulButton, divButton;
public CalculatorGUI() {
setTitle("Calculator");
setSize(300, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
// 创建输入框和按钮
num1Field = new JTextField(10);
num2Field = new JTextField(10);
resultField = new JTextField(10);
resultField.setEditable(false);
addButton = new JButton("+");
subButton = new JButton("-");
mulButton = new JButton("*");
divButton = new JButton("/");
// 设置布局
JPanel panel = new JPanel(new GridLayout(4, 2));
panel.add(new JLabel("Number 1:"));
panel.add(num1Field);
panel.add(new JLabel("Number 2:"));
panel.add(num2Field);
panel.add(new JLabel("Result:"));
panel.add(resultField);
panel.add(addButton);
panel.add(subButton);
panel.add(mulButton);
panel.add(divButton);
// 添加事件监听器
addButton.addActionListener(this);
subButton.addActionListener(this);
mulButton.addActionListener(this);
divButton.addActionListener(this);
// 将面板添加到窗口中
add(panel);
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
try {
// 获取输入的数字
double num1 = Double.parseDouble(num1Field.getText());
double num2 = Double.parseDouble(num2Field.getText());
// 计算结果
double result = 0;
if (e.getSource() == addButton) {
result = num1 + num2;
} else if (e.getSource() == subButton) {
result = num1 - num2;
} else if (e.getSource() == mulButton) {
result = num1 * num2;
} else if (e.getSource() == divButton) {
result = num1 / num2;
}
// 将结果显示在输出框中
resultField.setText(Double.toString(result));
} catch (NumberFormatException ex) {
JOptionPane.showMessageDialog(this, "Invalid input!");
} catch (ArithmeticException ex) {
JOptionPane.showMessageDialog(this, "Division by zero!");
}
}
public static void main(String[] args) {
new CalculatorGUI();
}
}
```
该程序中,我们创建了三个文本框,用于输入两个数字和显示计算结果,以及四个按钮,用于实现四则运算。在事件监听器中,我们根据按钮的不同,进行相应的计算,并将结果显示在输出框中。当输入无效的数字或进行除法运算时出现除数为零的情况时,程序会弹出相应的提示框。