Variable in Java

Every variable is assigned a data type which store the value of variable..
Variables are containers for storing data values..
Variables, store a value in a variable when can be changed during program execution.

type :- Where type is the data type that can be stored in variable.

name : - Where name is the given by user to the variable.

Types of Variable :

There are three types of variables in Java that is...

Local Variable
Instance Variable
Static Variable

1) What is Local Variable

A Local variables is declare inside the method or block or constructor is called local variable.

Example

 
class LocalVaribaleEx { 
              void StudentAge()  //StudentAge() is the  method.
    { 
       
        int age = 0;     // local variable  declare
        age = age + 5; 
        System.out.println("Student age is : " + age); 
    } 
    public static void main(String args[]) 
    { 
        LocalVaribaleEx obj = new LocalVaribaleEx(); 
        obj.StudentAge(); 
    } 
}

Output

2) What is Instance Variable

Instance Variable declared inside the class but outside the method.

Example

 
class InstanceVaribaleEx { 
              int age = 18;     // InstanceVaribale declare inside the class .

 void StudentAge() 
            { 
        System.out.println("Student age is : " + age); 
    } 

    public static void main(String args[]) 
    { 
        InstanceVaribaleEx obj = new InstanceVaribaleEx(); 
        obj.StudentAge(); 
    } 
}

Output

3) What is Static variable

Static variables are also known as Class variables.
Static is a keyword in Java, that is manily used for memory management.
We can use static keyword with variables, methods, blocks and nested classes.
Static variables declared as static is that is called static variable.

Example 1:

 class Student{  
       int id;
       String name;
       static String course="Engineer";  //static variable
       Student(int i,String n){   //constructor here  
        
        id=i;
        name=n;
      } void show() //method to display here
          {
            System.out.println(id+ " ," +name+ ", " +course);
          }
    public static void main(String args[]){  
     Student s1 = new Student(01,"Priyanka");
     Student s2 = new Student(01,"Pradeep");   
     s1.show();
     s2.show();
     }  
  }  

Output

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Control Statements

Variable in Java

Types of Variable :

1) What is Local Variable

2) What is Instance Variable

3) What is Static variable