I need Help for that program

Question

i do aprogram for sample calculator by Java there it , i Hope if u have any sugesst say to me Or if u have a program for that.
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Z extends Applet implements ActionListener {
     int n4=0;
     StringBuffer E;
     Character x;
     String s;
     TextField T1;
     public void init(){
          T1=new TextField(20);
          this.add(T1);
     Button a=new Button("2");
     this.add(a);
     a.setActionCommand("2");
     a.addActionListener(this);
     Button b=new Button("3");
     b.setActionCommand("3");
     this.add(b);
     b.addActionListener(this);
     Button d=new Button("-");
     this.add(d);
     d.setActionCommand("-");
     d.addActionListener(this);
          Button f=new Button("+");
     this.add(f);
     f.setActionCommand("+");
     f.addActionListener(this);
Button c=new Button("=");
     this.add(c);
c.setActionCommand("+");
c.addActionListener(this);}
public void actionPerformed(ActionEvent y){
     s=(y.getActionCommand());
     E=new StringBuffer();
               x= new Character (s.charAt(0));
     E.append(x.charValue());
          if(E.length() ==3){
               Character n=new Character(E.charAt(0));
                    Character m=new Character(E.charAt(2));
               int n1=Integer.parseInt(n.toString());
               int n2=Integer.parseInt(m.toString());
          if(E.charAt(1)=='+'){
               n4=n1+n2;}
               if(E.charAt(1)=='-'){
               n4=n1-n2;}
               if(E.charAt(1)=='*'){
               n4=n1*n2;}
               if(E.charAt(1)=='/'){
               n4=n1/n2;}
               if(s=="="){
               T1.setText(String.valueOf(n4));
     

Answer 1

the program is used for do acalculature, i want to know ,why he donot work? .The idea of that program it
When u click in any number(button) the action performed get that number , and store it in StringBuffer which that stringbuffer enabel me to store three things(the first number, the sign which be *or+, and the secand number)
and then put the result in variable and then put the result as aString in Text Field.
I hope u can understand me now and help me for that program, If u donot understand me ,Please Sugesst to me how to do the calculature program.thanks
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Z extends Applet implements ActionListener {
     int n4=0;
     StringBuffer E;
     Character x;
     String s;
     TextField T1;
     public void init(){
          T1=new TextField(20);
          this.add(T1);
     Button a=new Button("2");
     this.add(a);
     a.setActionCommand("2");
     a.addActionListener(this);
     Button b=new Button("3");
     b.setActionCommand("3");
     this.add(b);
     b.addActionListener(this);
     Button d=new Button("-");
     this.add(d);
     d.setActionCommand("-");
     d.addActionListener(this);
          Button f=new Button("+");
     this.add(f);
     f.addActionListener(this);
Button c=new Button("=");
     this.add(c);
     c.setActionCommand("=");
c.addActionListener(this);
public void actionPerformed(ActionEvent y){
     s=(y.getActionCommand());
     E=new StringBuffer();
               x= new Character (s.charAt(0));
     E.append(x.charValue());
          if(E.length() ==3){
               Character n=new Character(E.charAt(0));
                    Character m=new Character(E.charAt(2));
               int n1=Integer.parseInt(n.toString());
               int n2=Integer.parseInt(m.toString());
          if(E.charAt(1)=='+'){
               n4=n1+n2;}
               if(E.charAt(1)=='-'){
               n4=n1-n2;}
               if(E.charAt(1)=='*'){
               n4=n1*n2;}
               if(E.charAt(1)=='/'){
               n4=n1/n2;}
               if(s=="="){
               T1.setText(String.valueOf(n4));