Info-Grade

 
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class IFDemo extends JFrame
{
	JDesktopPane dp;
	JInternalFrame iframe;
	JTextField tb;
	JLabel lb;
	IFDemo()
	{
		setSize(400,300);		
		setDefaultLookAndFeelDecorated(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setVisible(true);
		dp=new JDesktopPane();
		iframe=new JInternalFrame("Internal Frame",true,true,true,true);
		iframe.setSize(200,200);
		iframe.setLocation(50,50);
		dp.add(iframe);
		add(dp);
		lb=new JLabel("Email");
		tb=new JTextField(10);
		iframe.setLayout(new FlowLayout(FlowLayout.CENTER));
		iframe.add(lb);
		iframe.add(tb);
		iframe.setVisible(true);		
	}	
	public static void main(String args[]) 
	{
		IFDemo frame=new IFDemo();		
	}
}

 
import javax.swing.*; 

class Menu extends JFrame{ 
 JMenuBar mb; 
 JMenu file, edit, data, name; 
 JMenuItem open, save, sas, cut, copy, paste; 
 JCheckBoxMenuItem  raju, indra;
 
 Menu(){ 
  setTitle("Menu Demo"); 
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

  mb=new JMenuBar(); 
  file=new JMenu("File"); 
  edit=new JMenu("Edit"); 
  data=new JMenu("Data"); 
  name=new JMenu("Name"); 

  open=new JMenuItem("Open"); 
  save=new JMenuItem("Save"); 
  sas=new JMenuItem("Save As"); 
  cut=new JMenuItem("Cut"); 
  copy=new JMenuItem("Copy"); 
  paste=new JMenuItem("Paste");

  raju=new JCheckBoxMenuItem("Raju"); 
  indra=new JCheckBoxMenuItem("Indra"); 

  file.add(open);  
  file.add(save); 
  file.add(sas); 

  edit.add(cut); 
  edit.add(copy); 
  edit.add(paste); 

  data.add(name); 

  name.add(raju); 
  name.add(indra); 

  mb.add(file); 
  mb.add(edit); 
  mb.add(data); 

  setJMenuBar(mb); 
  setSize(500, 500); 
  setVisible(true); 
 }

 public static void main(String args[]){
  new Menu(); 
 }
}

 
public class Student{
 int roll, marks; 
 String name;

 Student(int r, String n, int m){
  roll = r; 
  name = n; 
  marks = m; 
 }

 Student(int r, int m, String n){
  roll = r; 
  name = n; 
  marks = m;  
 }

 void displaInfo(){
  System.out.println(roll+"\t"+name+"\t"+marks);
 }
 public static void main(String args[]){
  Student s1 = new Student(1, "Ram", 56); 
  Student s2 = new Student(2, 89, "Shyam"); 

  System.out.println("Roll \t Name \t Marks");
  s1.displaInfo();
  s2.displaInfo(); 
 }
}

 
import java.util.Scanner; 
class Employee{
 int id, salary;
 String name; 

 public void getData(){
  Scanner in = new Scanner(System.in); 
  System.out.println("\nEnter the Following Info of Employee"); 
  System.out.print("Employee ID : "); 
  id = in.nextInt(); 
  System.out.print("Employee Name : "); 
  name = in.next(); 
  System.out.print("Employee Salary : "); 
  salary = in.nextInt(); 
 }

 public void displayData(){
  System.out.println("\n***Employee Details***"); 
  System.out.println("ID = "+id); 
  System.out.println("Name = "+name); 
  System.out.println("Salary = "+salary); 
 }
 
 public static void main(String args[]){
  Employee em1 = new Employee(); 
  Employee em2 = new Employee(); 

  em1.getData();
  em1.displayData(); 

  em2.getData();
  em2.displayData(); 
 }
}

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

class Calc extends JFrame implements ActionListener{
 
 JLabel l1, l2, l3; 
 JTextField t1, t2, t3; 
 JButton b1, b2; 

 Calc(){
  
  super("Handling Action Event"); 
  l1 = new JLabel("Enter First Number"); 
  l2 = new JLabel("Enter Second Number"); 
  l3 = new JLabel("Result"); 

  t1 = new JTextField(10); 
  t2 = new JTextField(10); 
  t3 = new JTextField(10); 

  b1 = new JButton("Add"); 
  b2 = new JButton("Subtract"); 

  setLayout(new FlowLayout(FlowLayout.LEFT,90,10));
  add(l1); 
  add(t1); 
  add(l2); 
  add(t2); 
  add(l3); 
  add(t3); 
  add(b1); 
  add(b2); 

  b1.addActionListener(this); 
  b2.addActionListener(this); 

  setSize(300, 300); 
  setVisible(true);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
 }

 public void actionPerformed(ActionEvent ae){
  int x, y, z; 
  x=Integer.parseInt(t1.getText()); 
  y=Integer.parseInt(t2.getText()); 
  if(ae.getSource() == b1){
   z = x + y; 
  }else{
   z = x - y; 
  }

  t3.setText(String.valueOf(z)); 
 }

 public static void main(String args[]){
  new Calc(); 
 }
}

4. What are different types of exceptions? Explain use of try.....catch and finaly with example.

• Built-In Exception
• User-Defined Exception

• Arithmetic Exception
• ArrayIndexOutOfBoundsException
• ClassNotFoundException
• FileNotFoundException
• IOException etc.

• A try block is used to enclose the code that might throw an exception. It must be used within the method. Java try block must be followed by either catch or finally block.
• Java catch block is used to handle the Exception. It must be used after the try block only.
• Java finally block is a block that is used to execute important code such as closing connection, stream etc. Java finally block is always executed whether exception is handled or not. Java finally block follows try or catch block.

 

public class TestFinally{
    public static void main(String args[]){
        try{
            int x = 20/0; 
            System.out.println("Quoitent = "+x); 
        }
        catch(ArithmeticException e){
            System.out.println("e.getMessage"); 
        }
        finally{
            System.out.println("Finally block is always executed"); 
        }
        System.out.println("Rest of the Codes .... "); 
    }
}

import javax.swing.*;  

class MenuDemo extends JFrame{
 
 JMenuBar mb; 
 JMenu file, edit, format; 
 JMenuItem open, save, save_as, exit, undo, redo; 

 MenuDemo(){
  setTitle("Menu Bar"); 
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

  mb=new JMenuBar(); 

  file=new JMenu("File"); 
  edit=new JMenu("Edit"); 
  format=new JMenu("Format"); 

  open=new JMenuItem("Open"); 
  save=new JMenuItem("Save"); 
  save_as=new JMenuItem("Save As"); 
  exit=new JMenuItem("Exit"); 
  undo=new JMenuItem("Undo"); 
  redo=new JMenuItem("Redo"); 

  file.add(open); 
  file.add(save); 
  file.add(save_as); 
  file.add(exit); 

  edit.add(undo); 
  edit.add(redo); 

  mb.add(file); 
  mb.add(edit); 
  mb.add(format); 

  setJMenuBar(mb); 
 
  setSize(300, 200); 
  setVisible(true); 
 }

 public static void main(String args[]){
  new MenuDemo(); 
 }
}