Differences between static and non-static methods in Java

JavaObject Oriented ProgrammingProgramming

A Java method is a collection of statements that are grouped together to perform an operation. When you call the System.out.println() method, for example, the system actually executes several statements in order to display a message on the console.

Static Method

A static method is also called a class method and is common across the objects of the class and this method can be accessed using class name as well.

Non-Static Method

Any method of a class which is not static is called non-static method or an instance method.

Following are the important differences between static and non-static method.

Sr. No.KeyStaticNon-Static
1AccessA static method can access only static members and can not access non-static members.A non-static method can access both static as well as non-static members.
2BindingStatic method uses complie time binding or early binding.Non-static method uses run time binding or dynamic binding.
3OverridingA static method cannot be overridden being compile time binding.A non-static method can be overridden being dynamic binding.
4Memory allocationStatic method occupies less space and memory allocation happens once.A non-static method may occupy more space. Memory allocation happens when method is invoked and memory is deallocated once method is executed completely.
5KeywordA static method is declared using static keyword.A normal method is not required to have any special keyword.

Example of static vs non-static method

JavaTester.java

public class JavaTester {
   public static void main(String args[]) {
      Tiger.roar();
      Tiger tiger = new Tiger();
      tiger.eat();
   }
}
class Tiger {
   public void eat(){
      System.out.println("Tiger eats");
   }
   public static void roar(){
      System.out.println("Tiger roars");
   }
}

Output

Tiger roars
Tiger eats
raja
Published on 26-Nov-2019 10:26:44
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