根据输入三角形三条边判断该三角形形状

package san;

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

public class SanTest extends Frame 
{
Jting Panduan=new Jting();
Button b1 = new Button("判断");
Button b2 = new Button("退出");
WindowClose2 Tuichu = new WindowClose2();
TextField txt1 = new TextField(5);
TextField txt2 = new TextField(5);
TextField txt3 = new TextField(5);
int a, b, c;

public SanTest() 
{
super("判断三角形");
this.setSize(300, 300);
this.setLocation(300, 200);
this.setForeground(Color.blue);
this.setBackground(Color.pink);
this.setLayout(new FlowLayout());

this.add(new Label("a:"));
this.add(txt1);

this.add(new Label("b:"));