使用MVC结构计算梯形面积

package com.ytu;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		WindowTrapezia win=new WindowTrapezia();
		win.setTitle("使用MVC结构");
		win.setBounds(100, 100,420,260);

	}

}
package com.ytu;
import java.awt.*;
import javax.swing.*;

import java.awt.event.*;
public class WindowTrapezia extends JFrame implements ActionListener{
    
	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		try{
			double a=Double.parseDouble(textA.getText().trim());
			double b=Double.parseDouble(textB.getText().trim());
			double c=Double.parseDouble(textC.getText().trim());
			trapezia .setA(a);
			trapezia .setB(b);
			trapezia .setC(c);
			String area=trapezia .getArea();
			showArea.append("梯形"+a+","+b+","+c+"的面积:");
			showArea.append(area+"\n");
			
		}
		catch(Exception ex){
			showArea.append("\n"+ex+"\n");
			
		}
		
	}
	Trapezia trapezia ;
	JTextArea showArea;
	JTextField textA,textB,textC;
	JButton controlButton;
	WindowTrapezia(){
    trapezia=new Trapezia();
	textA=new JTextField(5);
	textB=new JTextField(5);
	textC=new JTextField(5);
	showArea=new JTextArea();
	controlButton=new JButton("计算面积");
	JPanel pNorth=new JPanel();
	pNorth.add(new JLabel("上底A:"));
	pNorth.add(textA);
	pNorth.add(new JLabel("下底B:"));
	pNorth.add(textB);
	pNorth.add(new JLabel("高C:"));
	pNorth.add(textC);
	pNorth.add(controlButton);
	controlButton.addActionListener(this);
	add(pNorth,BorderLayout.NORTH);
	add(new JScrollPane(showArea),BorderLayout.CENTER);
	setVisible(true);
	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
	}
	
	
	

}
package com.ytu;
//梯形
public class Trapezia {
	double sideA,sideB,sideC,area;
	boolean isTrapezia;
	

	public void setA(double a) {
		// TODO Auto-generated method stub
		sideA=a;
		
	}

	public void setB(double b) {
		// TODO Auto-generated method stub
		sideB=b;
	}

	public void setC(double c) {
		// TODO Auto-generated method stub
		sideC=c;
	}

	public String getArea() {
		// TODO Auto-generated method stub
			area=(sideA+sideB)*sideC/2.0;
			return String.valueOf(area);
     }
}