Non Access Modifiers in Java

In this article, you will learn about Non-Access Modifiers. Below are the available Non Access Modifiers in Java.

  • Final
  • Abstract
  • Static
  • Strictfp
  • Native
  • Synchronized
  • Transient

Final Non Access Modifiers

Applicable to :

  1. Class
  2. Method
  3. Instance Variable
  4. Local Variable
  5. Method arguments

Final Class :

A Class, when set to final, cannot be extended by any other Class.

Example: A String Class in java.lang package

Final Method :

A Method, when set to final, cannot be overridden by any subclass.

Final Variable :

When a variable is set to final, its value cannot be changed. Final variables are like constants.

Example : public static final int i = 10;


Abstract Non Access Modifier

Keyword:

  • abstract

Applicable to:

  1. Class
  2. Method

Abstract Class:

An abstract Class can have abstract Methods. A Class can also be an abstract class without having any abstract Methods in it. If a Class has an abstract Method, the Class becomes an abstract Class.

Abstract Method :

Abstract Methods are those Methods which does not have a body but only a signature.

Example : public abstract void method();

Synchronized Non Access Modifier

Applicable to

  1. Method

Synchronized Method

Synchronized Methods can be accessed by only one thread at a time.

Native Non Access Modifier

Applicable to

  1. Method

Native Method

Naive Methods indicate that the method is implemented on a platform dependent code.

Strictfp Non-Access Modifier

Applicable to

  1. Class
  2. Method

Strictfp Class / Method

Strictfp non-access modifier forces floating point or floating point operation to adhere to IEEE 754 standard.

Note*: Strictfp non-access modifier cannot be applied on a variable.

Cheat sheet

  • Non Access Modifiers available in Java are Static, final, abstract, synchronized & Volatile
  • Static keyword can be applied to Variables & Methods.
  • Static Variable is those variables which are not associated with any instance but it is associated with class means all instances will access the same single copy of the variable.
  • Local variables can not be declared as Static.
  • Static keyword can also be applied to Methods. They will work for all the instances and they will not be dependent on instances created.
  • A final modifier can be applied to method and variables.
  • Final is the only modifier which will be available to the local variable.
  • Once declared as the final value of the variable can not be changed.
  • A final variable doesn’t get default value as opposed to instance variable coz value can’t be changed once assigned.
  • A final method cannot be overridden.
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31 Comments Non Access Modifiers in Java

  1. Pingback: Java Beginners Tutorial Java access modifiers tutorial for beginners

  2. npk

    when –> public final class String…how could we able to change the value?
    String x = “abc1”;
    x = “543”;

    Reply
  3. saravanan

    your website is pretty awesome. it will still more helpful to new beginner if you explain non-access modifier concept with example for program.

    Reply
  4. vandana

    i couldn’t find explanation for few things in the article such as, 1.difference b/w JDK/JRE/J2EE, 2.Transient, 3.Assignment Statement Topic

    Reply
  5. Rashmi

    could you please explain this statement ?
    “A class can also be an abstract class without having any abstract method in it. But once a class have an abstract method class becomes abstract class.”

    Reply
    1. Vivekanand Gautam

      Hi Rashmi,

      There could be 2 different scenarios.
      1- A class is having abstract Method
      2- A class doesn’t have abstract Method

      Scenario 1: If a class is having an Abstract method in that case there is no option but class needs to be declared as Abstract and you have to use abstract keyword with class.

      Scenario 2 : If a class doesn’t have any abstract method. In that case there is no reason to use abstract keyword with class. And you are not forced to do that. But you can use abstract keyword with class. So in this case you are free to declare class as abstract or normal class.

      Hope now it is clear. In case of any query let me know.

      Regards

      Reply
    2. Ravikiran

      A class is known as abstract in both the cases with and without abstarat method present in the class

      Reply
    3. sibin

      It says tat if in a class any method is abstract,tat class will automatically become abstract class..so we cant make object of the abstract class..so class also become abstract.(pls do refer others.my info. Will not be true)

      Reply
  6. Vinod

    You have declared a method as abstract method but it doesn’t have the keyword “abstract”. Please update…

    Reply
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  8. Suma

    Hi,
    I am new to Java. Could you please provide more programming details on Abstract Class/Method.
    I would like to practise more on this.

    Thanks!!!

    Reply
  9. pranit

    Well explained and understanding post!
    All java beginner should go through this concept here, its very useful to know about java non access modifiers in java. Will be looking forward to know about java access modifiers with examples. Thanks for sharing!

    Reply
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  11. Ram

    Hi Gautham,
    Thank you for such a great explanation, It’s really helpful for a person like me who is just started steps in Java World.

    Extending to your info, would you be able to provide me the real-time scenarios.
    1. When do we need to go for abstract and why?
    2. When do we need to go for strictfp, naive and static and why?

    Reply
    1. JBT

      Hi Ram,

      Abstract classes are used when you want subclasses to follow some rules about the method and also you want to provide the default implementation of some methods. Though in Latest versions of Java, this is not a valid scenario, coz now interface can also have a default method but there are things which can be done with abstract and not interface, So in those cases, it makes sense to use abstract.

      I have never used strictfp and naive for myself, so can’t give an example. But the static is a very frequently used keyword. It will be used when you want variable to be class level and not object level. A simple example would be if you want to have an int variable which should be used to count the number of times object of the class has been created. In that case, you will use a static variable to maintain the number.


      public class test123 {
      static int i;

      test123(){
      i++;
      System.out.println("No of times object created"+i);
      }
      public static void main(String[] args) {
      test123 t1 = new test123();
      test123 t2 = new test123();
      test123 t3 = new test123();

      }
      }

      Hope it help.

      Regards

      Reply

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