How can an instance variable be used in a class? explain your answer. (java)

Instantiate the object and access the variable using object reference.

Explanation:

In order to use/access an instance variable in a class, the class needs to be instantiated.For example:

class Demo{

    //Instance variable declaration

    int testvar=0;

    public static void main(String args[]){

          //Class instantiation

          Demo d = new Demo();  

          // The instance variable is accessed using the object reference

          d.testvar = 1;

    }

}

In case the instance variable in private then it can be accessed using its corresponding getter/setter methods.