2. Write a Java program that works as a simple calculator. Use a grid layout to arrange buttons for the digits and for the +, -,*, % operations. Add a text field to display the result. Handle any possible exceptions like divide by zero

 import java.awt.*;

import java.awt.event.*;

class Calculator extends WindowAdapter implements ActionListener{

Frame f;

Label l1;

Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0;

Button badd,bsub,bmult,bdiv,bmod,bcalc,bclr,bpts,bneg,bback;

double xd;

double num1,num2,check;

Calculator()

{

f= new Frame("MY CALCULATOR");

f.setSize(360,500);

f.setLayout(null);

f.setVisible(true);

// INSTANTIATING COMPONENETS

l1=new Label();

l1.setBackground(Color.LIGHT_GRAY);

l1.setBounds(50,50,260,60);

b1=new Button("1");

b1.setBounds(50,340,50,50);

b2=new Button("2");

b2.setBounds(120,340,50,50);

b3=new Button("3");

b3.setBounds(190,340,50,50);

b4=new Button("4");

b4.setBounds(50,270,50,50);

b5=new Button("5");

b5.setBounds(120,270,50,50);

b6=new Button("6");

b6.setBounds(190,270,50,50);

b7=new Button("7");

b7.setBounds(50,200,50,50);

b8=new Button("8");

b8.setBounds(120,200,50,50);

b9=new Button("9");

b9.setBounds(190,200,50,50);

b0=new Button("0");

b0.setBounds(120,410,50,50);

bneg=new Button("+/-");

bneg.setBounds(50,410,50,50);

bpts=new Button(".");

bpts.setBounds(190,410,50,50);

bback=new Button("back");

bback.setBounds(120,130,50,50);

badd=new Button("+");

badd.setBounds(260,340,50,50);

bsub=new Button("-");

bsub.setBounds(260,270,50,50);

bmult=new Button("*");

bmult.setBounds(260,200,50,50);

bdiv=new Button("/");

bdiv.setBounds(260,130,50,50);

bmod=new Button("%");

bmod.setBounds(190,130,50,50);

bcalc=new Button("=");

bcalc.setBounds(245,410,65,50);

bclr=new Button("CE");

bclr.setBounds(50,130,65,50);

b1.addActionListener(this);

b2.addActionListener(this);

b3.addActionListener(this);

b4.addActionListener(this);

b5.addActionListener(this);

b6.addActionListener(this);

b7.addActionListener(this);

b8.addActionListener(this);

b9.addActionListener(this);

b0.addActionListener(this);

bpts.addActionListener(this);

bneg.addActionListener(this);

bback.addActionListener(this);

badd.addActionListener(this);

bsub.addActionListener(this);

bmult.addActionListener(this);

bdiv.addActionListener(this);

bmod.addActionListener(this);

bcalc.addActionListener(this);

bclr.addActionListener(this);

f.addWindowListener(this);

//ADDING TO FRAME

f.add(l1);

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(badd);

f.add(bsub);

f.add(bmod);

f.add(bmult);

f.add(bdiv);

f.add(bmod);

f.add(bcalc);

f.add(bclr);

f.add(bpts);

f.add(bneg);

f.add(bback);

}

//FOR CLOSING THE WINDOW

public void windowClosing(WindowEvent e) {

f.dispose();

}

public void actionPerformed(ActionEvent e){

String z,zt;

//NUMBER BUTTON

if(e.getSource()==b1){

zt=l1.getText();

z=zt+"1";

l1.setText(z);

}

if(e.getSource()==b2){

zt=l1.getText();

z=zt+"2";

l1.setText(z);

}

if(e.getSource()==b3){

zt=l1.getText();

z=zt+"3";

l1.setText(z);

}

if(e.getSource()==b4){

zt=l1.getText();

z=zt+"4";

l1.setText(z);

}

if(e.getSource()==b5){

zt=l1.getText();

z=zt+"5";

l1.setText(z);

}

if(e.getSource()==b6){

zt=l1.getText();

z=zt+"6";

l1.setText(z);

}

if(e.getSource()==b7){

zt=l1.getText();

z=zt+"7";

l1.setText(z);

}

if(e.getSource()==b8){

zt=l1.getText();

z=zt+"8";

l1.setText(z);

}

if(e.getSource()==b9){

zt=l1.getText();

z=zt+"9";

l1.setText(z);

}

if(e.getSource()==b0){

zt=l1.getText();

z=zt+"0";

l1.setText(z);

}

if(e.getSource()==bpts){ //ADD DECIMAL PTS

zt=l1.getText();

z=zt+".";

l1.setText(z);

}

if(e.getSource()==bneg){ //FOR NEGATIVE

zt=l1.getText();

z="-"+zt;

l1.setText(z);

}

if(e.getSource()==bback){ // FOR BACKSPACE

zt=l1.getText();

try{

z=zt.substring(0, zt.length()-1);

}catch(StringIndexOutOfBoundsException f){return;}

l1.setText(z);

}

//AIRTHMETIC BUTTON

if(e.getSource()==badd){ //FOR ADDITION

try{

num1=Double.parseDouble(l1.getText());

}catch(NumberFormatException f){

l1.setText("Invalid Format");

return;

}

z="";

l1.setText(z);

check=1;

}

if(e.getSource()==bsub){ //FOR SUBTRACTION

try{

num1=Double.parseDouble(l1.getText());

}catch(NumberFormatException f){

l1.setText("Invalid Format");

return;

}

z="";

l1.setText(z);

check=2;

}

if(e.getSource()==bmult){ //FOR MULTIPLICATION

try{

num1=Double.parseDouble(l1.getText());

}catch(NumberFormatException f){

l1.setText("Invalid Format");

return;

}

z="";

l1.setText(z);

check=3;

}

if(e.getSource()==bdiv){ //FOR DIVISION

try{

num1=Double.parseDouble(l1.getText());

}catch(NumberFormatException f){

l1.setText("Invalid Format");

return;

}

z="";

l1.setText(z);

check=4;

}

if(e.getSource()==bmod){ //FOR MOD/REMAINDER

try{

num1=Double.parseDouble(l1.getText());

}catch(NumberFormatException f){

l1.setText("Invalid Format");

return;

}

z="";

l1.setText(z);

check=5;

}

//RESULT BUTTON

if(e.getSource()==bcalc){

try{

num2=Double.parseDouble(l1.getText());

}catch(Exception f){

l1.setText("ENTER NUMBER FIRST ");

return;

}

if(check==1)

xd =num1+num2;

if(check==2)

xd =num1-num2;

if(check==3)

xd =num1*num2;

if(check==4)

xd =num1/num2;

if(check==5)

xd =num1%num2;

l1.setText(String.valueOf(xd));

}

//FOR CLEARING THE LABEL and Memory

if(e.getSource()==bclr){

num1=0;

num2=0;

check=0;

xd=0;

z="";

l1.setText(z);

}

}

//MAIN METHOD where objects of MyCalc is instantaiated

public static void main(String args[]){

new Calculator();

}

}

unit 4 ppt

Unit 4  Click Here

Internal Frame

import java.awt.Container;

import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;

public class InternalFrameExample extends JFrame{

   
   
    JFrame jf;
    JDesktopPane desk;
    JInternalFrame intfr,int2;
    Container cont;
   
    public InternalFrameExample() {
        // TODO Auto-generated constructor stub
   
    jf=new JFrame();
    setSize(500, 500);
    setVisible(true);
    setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
   
   
    intfr=new JInternalFrame("Internal1", true, true, true);
    intfr.setSize(250, 250);
    intfr.setVisible(true);
   
   
   

   
   
    desk=new JDesktopPane();
    desk.add(intfr);

   
    getContentPane().add(desk);
   
   
   
    }
   
   
   
   
   
    public static void main(String[] args) {
        // TODO Auto-generated method stub
InternalFrameExample ife=new InternalFrameExample();
    }

}

Confirmation Box

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class ActionConfDialog extends JFrame implements ActionListener {


    JFrame jf;
    JPanel panel;
    JButton b1;
    JLabel l1;
   
   
    public ActionConfDialog() {
        // TODO Auto-generated constructor stub
        jf=new JFrame();
        setTitle("Confirmation box");
        setVisible(true);
        setSize(300, 200);
        setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());
   
       
        l1=new JLabel();
        b1=new JButton("Confirmation dialog");
        b1.addActionListener(this);
       
       
   
    add(b1);
    add(l1);

    }
   
   
   
   
    public static void main(String[] args) {
        // TODO Auto-generated method stub
ActionConfDialog ac=new ActionConfDialog();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
       
       
       
       
        if (e.getSource()==b1) {
           
           
        int res=    JOptionPane.showConfirmDialog(null, "Do you want to save ?", "Confirm Box", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
       
               
               
               
                if (res==JOptionPane.YES_OPTION) {
                   
                    l1.setText("you saved the program");
                   
                }else {
                    l1.setText("you did nt save the program ");
                }
        }
    }

}
 

Dialog _ INPUT DIALOG BOXty

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

public class Dialogs extends JFrame implements ActionListener {


   
    JFrame jf;
    JButton b1;
    JLabel l1;
   
   
   
   
   
    public Dialogs() {
        // TODO Auto-generated constructor stub
   
    jf=new JFrame();
    setVisible(true);
    setSize(300, 200);
    setDefaultCloseOperation(jf.EXIT_ON_CLOSE);
    setLayout(new FlowLayout());
   
   
    l1=new JLabel();
    b1=new JButton("Confirmation dialog");
    b1.addActionListener(this);
   
   
    add(b1);

    add(l1);
   
    }
   
   
   
   
   
    public static void main(String[] args) {
        // TODO Auto-generated method stub
Dialogs d=new Dialogs();
    }





    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub
       
       
        if (e.getSource()==b1) {
           
            int i=JOptionPane.QUESTION_MESSAGE;
            String s=JOptionPane.showInputDialog(jf, "What is u r name?", "Question", i);
           
            l1.setText("u r name is "+s);
        }
       
       
       
       
       
    }

}