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

public class calculator extends JFrame implements java.awt.event.ActionListener {
    

        private  JButton b[];
        private  JTextField text;
        private String names[] ={"1","2","3","*",
                                 "4","5","6","-",
                                 "7","8","9","+",
                                 "c","0","=","/"};
        private Container c,z;
        private GridLayout grid1,grid2;
        
        public calculator(){
            super("Calculater");
            
            grid1 = new GridLayout(2,1);
            grid2 = new GridLayout(4,4);
            
            c=getContentPane();
            c.setLayout(grid1);
        //    z=getContentPane();
        //    z.setLayout(grid2);
            
            text = new JTextField(10);
        //    c.add(text);
            b=new JButton[names.length];
        for(int i=0;i<names.length;i++)
        {
            b[i]=new JButton(names[i]);
            b[i].addActionListener(this);
                c.add(b[i]);
        }
    
            setSize(300,150);
            show();        
        }
    
    public void ActionPerformed(ActionEvent e)
    {
        if (e.getSource()==b[1])
            System.exit(0);
        
    }
    
    public static void main (String args[])
    {
        calculator app = new calculator();
        app.addWindowListener(
            new WindowAdapter(){
                public  void windowClosing(WindowEvent e)
                {
                    System.exit(0);
                }
            }
        );
    }
}

public void actionPerformed(ActionEvent e)

public void ActionPerformed(ActionEvent e)

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

public class calculator extends JFrame implements java.awt.event.ActionListener {
    

        private  JButton b[];
        private  JTextField text;
        private String names[] ={"1","2","3","*",
                                 "4","5","6","-",
                                 "7","8","9","+",
                                 "c","0","=","/"};
        private Container c,z;
        private GridLayout grid1,grid2;
        
        public  calculator(){
            super("Calculater");
            
            grid1 = new GridLayout(2,1);
            grid2 = new GridLayout(4,4);
            
            c=getContentPane();
            c.setLayout(grid1);
            z=getContentPane();
            z.setLayout(grid2);
            
            text = new JTextField(10);
            c.add(text);
            b=new JButton[names.length];
        for(int i=0;i<names.length;i++)
        {
            b[i]=new JButton(names[i]);
            b[i].addActionListener(this);
                z.add(b[i]);
        }
    
            setSize(300,150);
            show();        
        }
    
    public void actionPerformed(ActionEvent e)
    {
        if (e.getSource()==b[1])
            System.exit(0);
        
    }
    
    public static void main (String args[])
    {
        calculator app = new calculator();
        app.addWindowListener(
            new WindowAdapter(){
                public  void windowClosing(WindowEvent e)
                {
                    System.exit(0);
                }
            }
        );
    }
}

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.awt.*;
/**
*
* @author abdalla
*/
public class NewClass extends JFrame implements ActionListener{
    JPanel p1=new JPanel();
    JTextField text=new JTextField(15);
   JLabel l=new JLabel("abuoof");
    JButton b1=new JButton("b");
   JButton b2=new JButton("b");
   JButton b3=new JButton("b");
   JButton b4=new JButton("b");
   JButton b5=new JButton("b");
   JButton b6=new JButton("b");
   JButton b7=new JButton("b");
   JButton b8=new JButton("b");
   JButton b9=new JButton("b");
   JButton b10=new JButton("b");
   JButton b11=new JButton("b");
   JButton b12=new JButton("b");
   JButton b13=new JButton("b");
   JButton b14=new JButton("b");
   JButton b15=new JButton("b");
   JButton b16=new JButton("b");
   /** Creates a new instance of NewClass */
    public NewClass() {
  
  
   add(text,BorderLayout.NORTH);
   add(l,BorderLayout.CENTER);
   add(p1,BorderLayout.SOUTH);
    p1.setLayout(new GridLayout(4,4));
   p1.add(b1);
    p1.add(b2);
    p1.add(b2);
    p1.add(b3);
    p1.add(b4);
    p1.add(b5);
    p1.add(b6);
    p1.add(b7);
    p1.add(b8);
    p1.add(b9);
    p1.add(b10);
    p1.add(b11);
    p1.add(b12);
    p1.add(b13);
    p1.add(b14);
    p1.add(b15);
    p1.add(b16);
    }

    public void actionPerformed(ActionEvent e) {
   if (e.getSource() ==b1){
  
   }
   else if
(e.getSource() ==b2){
  
   }
   /////// write from 3:16
  
    }
    

public static void main (String args[])
    {
      NewClass n=new NewClass();
n.setTitle("nnnn");
n.setLocationRelativeTo(null);
n.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
n.setSize(200, 200);
n.setVisible(true);

}}

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
/**
*
* @author abdalla
*/
public class grid extends JFrame implements ActionListener{
     JPanel p1=new JPanel();
    JTextField text=new JTextField(15);
    JButton b1=new JButton("b");
   JButton b2=new JButton("b");
   JButton b3=new JButton("b");
   JButton b4=new JButton("b");
   JButton b5=new JButton("b");
   JButton b6=new JButton("b");
   JButton b7=new JButton("b");
   JButton b8=new JButton("b");
   JButton b9=new JButton("b");
   JButton b10=new JButton("b");
   JButton b11=new JButton("b");
   JButton b12=new JButton("b");
   JButton b13=new JButton("b");
   JButton b14=new JButton("b");
   JButton b15=new JButton("b");
   JButton b16=new JButton("b");
    /** Creates a new instance of grid */
    public grid() {
   setLayout(new GridLayout(2,1));  
     add(text);
     add(p1);
   p1.setLayout(new GridLayout(4,4));
   p1.add(b1);
    p1.add(b2);
    p1.add(b2);
    p1.add(b3);
    p1.add(b4);
    p1.add(b5);
    p1.add(b6);
    p1.add(b7);
    p1.add(b8);
    p1.add(b9);
    p1.add(b10);
    p1.add(b11);
    p1.add(b12);
    p1.add(b13);
    p1.add(b14);
    p1.add(b15);
    p1.add(b16);
    }
      public void actionPerformed(ActionEvent e) {
   if (e.getSource() ==b1){
  
   }
   else if
(e.getSource() ==b2){
  
   }
   /////// write from 3:16
  
    }
    

public static void main (String args[])
    {
       grid n=new grid();
n.setTitle("title");
n.setLocationRelativeTo(null);
n.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
n.setSize(200, 200);
n.setVisible(true);

}
}