Hello friends For multidigit calculator code u can visit the follwowing link

Java Calculator Code and methods

import java.awt.*; import java.awt.event.*;

class AA implements ActionListener { Frame f; TextField tf;

Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0,plush,minus,mul,div,equal,clear;

String s="";

int n,c;

AA()
{
    f=new Frame("jamshjed");
    tf=new TextField();
    tf.setBounds(50,50,300,50);

    b1=new Button("1");
    b1.setBounds(50,150,50,50);
    b1.addActionListener(this);

    b2=new Button("2");
    b2.setBounds(105,150,50,50);
    b2.addActionListener(this);

    b3=new Button("3");
    b3.setBounds(160,150,50,50);b3.addActionListener(this);

    b4=new Button("4");
    b4.setBounds(215,150,50,50);b4.addActionListener(this);

    b5=new Button("5");
    b5.setBounds(270,150,50,50);b5.addActionListener(this);

    b6=new Button("6");
    b6.setBounds(50,230,50,50);b6.addActionListener(this);

    b7=new Button("7");
    b7.setBounds(105,230,50,50);b7.addActionListener(this);

    b8=new Button("8");
    b8.setBounds(160,230,50,50);b8.addActionListener(this);

    b9=new Button("9");
    b9.setBounds(215,230,50,50);b9.addActionListener(this);

    b0=new Button("0");
    b0.setBounds(270,230,50,50);b0.addActionListener(this);

    plush=new Button("+");
    plush.setBounds(50,310,160,50);plush.addActionListener(this);

    minus=new Button("-");
    minus.setBounds(215,310,105,50);minus.addActionListener(this);

    mul=new Button("*");
    mul.setBounds(50,390,50,50);mul.addActionListener(this);

    equal=new Button("=");
    equal.setBounds(105,390,50,50);equal.addActionListener(this);

    div=new Button("/");
    div.setBounds(160,390,50,50);div.addActionListener(this);

    clear=new Button("c");
    clear.setBounds(215,390,105,50);clear.addActionListener(this);

    f.add(b1);
    f.add(b2);
    f.add(b3);
    f.add(b4);
    f.add(b5);
    f.add(b6);
    f.add(b7);
    f.add(b8);
    f.add(b9);
    f.add(b0);
    f.add(plush);
    f.add(minus);
    f.add(mul);
    f.add(equal);
    f.add(div);
    f.add(clear);

    f.add(tf);
    f.setSize(500,500);
    f.setLayout(null);
    f.setVisible(true);
}

public void actionPerformed(ActionEvent e)
{
    if(e.getActionCommand().equals("1"))
    {

        s=s+"1";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("2"))
    {
        s=s+"2";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("3"))
    {
        s=s+"3";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("4"))
    {
        s=s+"4";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("5"))
    {
        s=s+"5";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("6"))
    {
        s=s+"6";
        tf.setText(s);
    }
    if(e.getActionCommand().equals("7"))
    {
        s=s+"7";
        tf.setText(s);
    }
    if(e.getActionCommand().equals("8"))
    {
        s=s+"8";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("9"))
    {
        s=s+"9";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("0"))
    {
        s=s+"0";
        tf.setText(s);
    }

    if(e.getActionCommand().equals("+"))
    {
        n=Integer.parseInt(tf.getText());
        tf.setText("");
        s="";
        c=1;


    }

    if(e.getActionCommand().equals("-"))
    {
        n=Integer.parseInt(tf.getText());
        tf.setText("");
        s="";
        c=2;
    }
    if(e.getActionCommand().equals("/"))
    {
        n=Integer.parseInt(tf.getText());
        tf.setText("");
        s="";
        c=3;

    }
    if(e.getActionCommand().equals("*"))
    {
        n=Integer.parseInt(tf.getText());
        tf.setText("");
        s="";
        c=4;

    }

    if(e.getActionCommand().equals("c"))
    {

        tf.setText("");
        s="";


    }
    if(e.getActionCommand().equals("="))
    {

        if(c==1)
        {
            int j=Integer.parseInt(tf.getText());
            int k=n+j;
            String ss=String.valueOf(k);
            tf.setText(ss);

        }
        if(c==2)
        {
            int j=Integer.parseInt(tf.getText());
            int k=n-j;
            String ss=String.valueOf(k);
            tf.setText(ss);

        }

        if(c==3)
        {
            int j=Integer.parseInt(tf.getText());
            int k=n/j;
            String ss=String.valueOf(k);
            tf.setText(ss);

        }
        if(c==4)
        {
            int j=Integer.parseInt(tf.getText());
            int k=n*j;
            String ss=String.valueOf(k);
            tf.setText(ss);

        }

    }



}

public static void main(String... aa)
{
    AA o=new AA();
}

}