Datatypes

• Data types are the types of values used in java program.
• Datatypes are classified into two types 1) Primitive Datatype 2) Non-primitive Datatype

  1) Primitive Datatype

• Primitive data type are the type of primitive values used in java program.
• Primitive data type are classified into

• Note
  All are keywords.

  2) Non-primitive Datatype

• Non-primitive data type are the type of non-primitive values used in java program.
• e.g. String

Variables

• Variables is the name given to the block of memory to stored the value.
• Syntax
    datatype variable_name = value;
  

   e.g. int num = 10;   
  

• variables are classified into two types : 1) Global Variables 2) Local Variables
  

1) Global Variables

• The variables which are declared inside class block such a variables are called as global variables.
• All global variables will having it’s default value.

2) Local Variables

• The variables which are declared inside the method block such a variables are called as local variables.
• All local variables will not having it’s default value.

class P1
{
  public static void main(String[]args)
  {
    int var = 10;
    System.out.println(var);
  }
}

• Ans = 10

class P1
{
  public static void main(String[]args)
  {
    int var;
    System.out.println(var);
  }
}

• Ans = (Compile Time Error) variable not initillized

class P1
{
  public static void main(String[]args)
  {
    int var;
    var = 10;
    System.out.println(var);
  }
}

• Ans = 10

class P1
{
  public static void main(String[]args)
  {
    int a,b,c;
    a = 10; b = 20; c = 30;
    System.out.println(a);
    System.out.println(b);
    System.out.println(c);
  }
}

• Ans = 10,20,30

Priniting Statements in java