Lados De Un Triangulo C++

//Lados de un triangulo

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

public class prueba extends JFrame implements ActionListener {
/**
*
*/
private staticfinal long serialVersionUID = 1L;
private JTextField textfield1,textfield2,textfield3,textfield4,textfield5,textfield6,textfield7,textfield8;
private JLabel label1,label2,label3,label4,label5,label6;private JButton boton1,boton2,boton3,boton4,boton5,boton6,boton7,boton8,boton9,boton10,boton11,boton12,boton13,boton14;

public prueba() {
setLayout(null) ;
textfield1 = new JTextField();textfield1.setBounds(125,12,100,30);
add(textfield1);
textfield2 = new JTextField();
textfield2.setBounds(125,50,100,30);
add(textfield2);
textfield3 = new JTextField();textfield3.setBounds(125,90,100,30);
add(textfield3);
textfield4 = new JTextField();
textfield4.setBounds(125,130,100,30);
add(textfield4);
textfield5 = new JTextField();textfield5.setBounds(125,170,100,30);
add(textfield5);
textfield6 = new JTextField();
textfield6.setBounds(85,270,100,30);
add(textfield6);
textfield7 = new JTextField();textfield7.setBounds(390,20,100,30);
add(textfield7);
textfield8 = new JTextField();
textfield8.setBounds(390,80,100,30);
add(textfield8);
label1 = new JLabel("Lado a:");
label1.setBounds(80,15,120,20);add(label1);
label2 = new JLabel("Lado b:");
label2.setBounds(80,55,70,20);
add(label2);
label3 = new JLabel("Lado h:");
label3.setBounds(80,95,130,20);
add(label3);
label4 = newJLabel("Alpha: ");
label4.setBounds(85,133,80,20);
add(label4);
label5 = new JLabel("Beta: ");
label5.setBounds(85,170,90,30);
add(label5);
label6 = new JLabel("El Lado es: ");label6.setBounds(10,270,110,30);
add(label6);
boton1=new JButton("a y b");
boton1.setBounds(10,210,100,15);
boton1.addActionListener(this);
add(boton1);
boton2=new...