Example of an instance method? (Java)

Question

I\'m still learning about methods in Java and was wondering how exactly you might use an instance method. I was thinking about something like this:

public vo         


        

Answer 1

Instance method means the object of your class must be created to access the method. On the other hand, for static methods, as its a property of Class and not that of its object/instance, it is accessed without creating any instance of the class. But remember static methods can only access static variables, where as instance method can access the instance variables of your class. Static methods and static variables are useful for memory management as it does not require to declare objects which would otherwise occupy memory.

Example of instance method and variable :

public class Example {
    int a = 10;   // instance variable
    private static int b = 10;  // static variable (belongs to the class)

    public void instanceMethod(){
        a =a + 10;
    }

    public static void staticMethod(){
        b = b + 10;
    }
}

void main(){

    Example exmp = new Example();
    exmp.instanceMethod();  // right
    exmp.staticMethod();  // wrong..error..

    // from here static variable and method cant be accessed.

}