java利用swing组件编写程序实现输入梯形上底、下底、高，并进行面积计算，附带效果图

好的，以下是一个利用Java Swing组件编写的梯形面积计算程序：

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

public class TrapezoidAreaCalculator extends JFrame implements ActionListener {
    private JLabel label1, label2, label3, label4;
    private JTextField textField1, textField2, textField3;
    private JButton button;
    
    public TrapezoidAreaCalculator() {
        setTitle("梯形面积计算器");
        setSize(400, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(4, 2));
        
        label1 = new JLabel("梯形上底：");
        add(label1);
        textField1 = new JTextField();
        add(textField1);
        
        label2 = new JLabel("梯形下底：");
        add(label2);
        textField2 = new JTextField();
        add(textField2);
        
        label3 = new JLabel("梯形高：");
        add(label3);
        textField3 = new JTextField();
        add(textField3);
        
        button = new JButton("计算面积");
        add(button);
        button.addActionListener(this);
        
        label4 = new JLabel("");
        add(label4);
        
        setVisible(true);
    }
    
    public void actionPerformed(ActionEvent event) {
        double upperBase = Double.parseDouble(textField1.getText());
        double lowerBase = Double.parseDouble(textField2.getText());
        double height = Double.parseDouble(textField3.getText());
        double area = (upperBase + lowerBase) * height / 2;
        label4.setText("梯形面积为：" + area);
    }
    
    public static void main(String[] args) {
        new TrapezoidAreaCalculator();
    }
}

效果图如下：