Programacion Java Applet Calculadora

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package applet1;

import java.applet.*;

import java.awt.event.*;

import java.awt.*;

/**

*

* @author Juan

*/

public class AppletCalculadora extends Applet implements ActionListener{

Panel p1,p2;

TextField t1;

Button [] botones=new Button[18];

double op1,op2,resultado;

int operador;

int oper=-1;

@Override

public void init() {

this.resize(130,200);

}

public AppletCalculadora(){

t1=new TextField("",12);

add(t1);

p2=new Panel(new GridLayout(6,3,5,5));

for(int i=0;i<18;i++){

if(i<9){

botones[i]=new Button(String.valueOf(i+1));

}

switch (i){

case 9:

botones[i]=new Button(".");

break;

case 10:

botones[i]=new Button("0");

break;

case 11:

botones[i]=new Button("CE");

break;

case 12:

botones[i]=new Button("+");

break;

case 13:

botones[i]=new Button("-");

break;

case 14:

botones[i]=new Button("=");

break;

case 15:

botones[i]=new Button("*");

break;

case 16:

botones[i]=new Button("/");

break;

case 17:

botones[i]=new Button("C");

break;

}

botones[i]. addActionListener(this);

p2.add(botones[i]);

}

add(p2);

}

public void actionPerformed(ActionEvent e) {

for(int i=0;i<9;i++){

if(e.getSource()==botones[i]){

if(oper==-1){

t1.setText(t1.getText()+String.valueOf(i+1));

}else{

t1.setText(String.valueOf(i+1));

...