Calculadora.java

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

public class tarea2 extends JFrame implements ActionListener
{

private static JTextField t1=new JTextField();
privatestatic int sn1,sn2,suma,rn1,rn2,resta,mn1,mn2,multiplicacion,dn1,dn2,division;
private static int sb,rb,mb,db;
private static String persona = "p";

public static void main(String form[])
{JFrame frame = new JFrame("Calculadora");

JPanel p1;



p1 = new JPanel(new GridLayout(5,4,10,10));

frame.getContentPane().setLayout(new BorderLayout());JButton uno = new JButton("1");
JButton dos = new JButton("2");
JButton tres = new JButton("3");
JButton cuatro = new JButton("4");
JButton cinco = new JButton("5");
JButton seis =new JButton("6");
JButton siete = new JButton("7");
JButton ocho = new JButton("8");
JButton nueve = new JButton("9");
JButton cero = new JButton("0");
JButton c = new JButton("C");JButton ce = new JButton("CE");
JButton sum = new JButton("+");
JButton res = new JButton("-");
JButton mul = new JButton("*");
JButton div = new JButton("/");
JButton pun = newJButton(".");
JButton re = new JButton("=");

p1.add(uno);
p1.add(dos);
p1.add(tres);
p1.add(cuatro);
p1.add(cinco);
p1.add(seis);
p1.add(siete);
p1.add(ocho);
p1.add(nueve);p1.add(cero);
p1.add(c);
p1.add(ce);
p1.add(sum);
p1.add(res);
p1.add(mul);
p1.add(div);
p1.add(pun);
p1.add(re);

frame.add(p1,BorderLayout.SOUTH);
frame.add(t1,BorderLayout.NORTH);


frame.pack();
frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

uno.addActionListener(new tarea2());uno.setActionCommand("uno");

dos.addActionListener(new tarea2());
dos.setActionCommand("dos");

tres.addActionListener(new tarea2());
tres.setActionCommand("tres");

cuatro.addActionListener(new...