Contents

Introduction to Java

DataType and Operation

Conditional statements

Iterative statements

Nested loops

Functions

OOPs

String

Static Data members

Inherintance

Polymorphisam

Applets

AWT

MultiThreading

I/o

Exception Handling

Collection FrameWork

Contents

Introduction to Java

DataType and Operation

Conditional statements

Iterative statements

Nested loops

Functions

OOPs

String

Static Data members

Inherintance

Polymorphisam

Applets

AWT

MultiThreading

I/o

Exception Handling

Collection FrameWork

Immutable/Mutable object

Immutable Objects

Objects whose current state cannot be changes once it is created are called as Immutable Objects
Such objects do not have setter methods and other special methods which will change its current state
For ex: String, Integer, Long etc.

#Example

Design a class Rectangle

Data members

Length
Breadth

Member Functions

Area()
rectangle(l,b)

  class rectangle 
  {
    private int length,breadth;
    public void area()
    {
        int a=length*breadth;
        System.out.println("Area is "+a);
    }
    public rectangle(int m,int n)
    {
        length=m;
        breadth=n;
    }
  }
  class demo
  {
    public static void main(String args[])
    {
        rectangle a=new rectangle(5,7); 
        a.area();
    }
  }

Area is 35

Mutable object

The objects in which you can change objects current state after the object is created are known as Mutable objects.
Such objects have setter methods and other special methods which will change current state of object.
For ex: java.util.Date, java.lang.StringBuilder etc.

#Example.

Design a class Account

Data members

accno
balance

Member Functions

Account(an,bl)
deposit(amt)
withdraw(amt)
showBalance()

  class Account 
  {
    private int accno,balance;
    public Account(int an,int bl)
    {
        accno = an;
        balance = bl;
    }
    public void showData()
    {
        System.out.println("AccNo is"+accno);
        System.out.println("Balance is"+ balance);
    }
    public void deposit(int amt)
    {
        balance=balance+amt;
    }
    public void withdraw(int amt)
    {
        balance=balance-amt;
    }
  }
  class demo
  {
    public static void main(String args[])
    {
        Account a=new Account(4117,25000);
        a.showData();
        a.deposit(7000);
        a.withdraw(2000);
        a.deposit(4000);
        a.showData();
    }
  }

AccNo is 4117 
Balance is 25000 
AccNo is 4117
Balance is 34000

#Example

Design a class Account

Data members

accno
balance

Member Functions

Account(an,bl)
showBalance()
addInterest(r,n)

  class Account 
  {
    private int accno;
    private double balance;
    public Account(int an,int bl)
    {
        accno = an;
        balance = bl;
    }
    public void showData()
    {
        System.out.println("AccNo is"+ accno);
        System.out.println("Balance is"+balance);
    }
    public void addInterest(double r,int n)
    {
        double si=balance*r*n/100;
        balance =balance+si;
    }
  }
  class demo
  {
    public static void main(String args[])
    {
        Account a = new Account(4117,25000);
        a.showData();
        a.addInterest(10.25,3);
        a.showData();
    }
  }

AccNo is 4117 
Balance is 25000
AccNo is 4117 
Balance is 32687.5

#Example.

Design a class Worker

Data members

wages
wdays

Member Functions

Worker(wg,wd)
payment()
addwdays(n)

  class Worker
  {
    private int wages,wdays;
    public Worker(int w,int d)
    {
        wages=w;
        wdays=d;
    }
    public void payment()
    { 
        int p=wages*wdays;
        System.out.println("Payment is"+p);
    }
    public void addWdays(int n)
    {
        wdays=wdays+n;
    }
  }
  class demo
  {
    public static void main(String args[])
    {
        Worker a;
        a = new Worker(500,5);
        a.payment();
        a.addWdays(2);
        a.payment();
        a.addWdays(3);
        a.payment();
    }
  }

Payment is 2500 
Payment is 3500 
Payment is 5000

CCITcoder

Introduction to Java

DataType and Operation

Conditional statements

Iterative statements

Functions

OOPs

String

Static Data members

Inherintance

Polymorphisam

Applets

AWT

MultiThreading

I/o

Exception Handling

Collection FrameWork

Introduction to Java

DataType and Operation

Conditional statements

Iterative statements

Functions

OOPs

String

Static Data members

Inherintance

Polymorphisam

Applets

AWT

MultiThreading

I/o

Exception Handling

Collection FrameWork

Immutable/Mutable object

Immutable Objects

Mutable object