MVC_Triangle_S.zip_java编三角形_triangle

import java.awt.*; import javax.swing.*; import java.awt.event.*; public class WindowTriangle extends JFrame implements ActionListener { Triangle triangle; JTextField text1,text2,text3; JTextArea textshow; JButton button; JPanel panel; WindowTriangle() { setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); init(); } public void init() { triangle=new Triangle(); text1=new JTextField(5); text2=new JTextField(5); text3=new JTextField(5); textshow=new JTextArea(); button=new JButton("计算面积"); panel=new JPanel(); panel.add(new JLabel("边A")); panel.add(text1); panel.add(new JLabel("边B")); panel.add(text2); panel.add(new JLabel("边C")); panel.add(text3); panel.add(button); add(panel,BorderLayout.NORTH); add(textshow,BorderLayout.CENTER); add(new JScrollPane(textshow)); button.addActionListener(this); } public void actionPerformed(ActionEvent e) { try { double a=Double.parseDouble(text1.getText().trim()); double b=Double.parseDouble(text2.getText().trim()); double c=Double.parseDouble(text3.getText().trim()); triangle.setA(a); triangle.setB(b); triangle.setC(c); String area=triangle.getArea(); textshow.append("三角形"+a+","+b+","+c+"的面积："+area+"\n"); } catch(Exception ex) { textshow.append("\n"+ex+"\n"); } } }