用Java写求圆的面积的中文视图代码

以下是用Java编写求圆的面积的中文视图代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class CircleArea extends JFrame implements ActionListener {
    private JPanel panel;
    private JLabel label1, label2;
    private JTextField textField;
    private JButton button;

    public CircleArea() {
        setTitle("求圆面积");
        setSize(300, 150);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        panel = new JPanel();
        panel.setLayout(new GridLayout(2, 2, 5, 5));

        label1 = new JLabel("请输入圆的半径：");
        panel.add(label1);
        textField = new JTextField();
        panel.add(textField);

        label2 = new JLabel();
        panel.add(label2);
        button = new JButton("计算");
        button.addActionListener(this);
        panel.add(button);

        add(panel, BorderLayout.CENTER);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        double radius = Double.parseDouble(textField.getText());
        double area = Math.PI * radius * radius;
        label2.setText("圆的面积为：" + area);
    }

    public static void main(String[] args) {
        new CircleArea();
    }
}

运行程序后，会弹出一个窗口，用户可以在其中输入圆的半径，点击“计算”按钮后，程序会计算圆的面积并在窗口中显示出来。