Can I override and overload static methods in Java

Question

I d like to know    Why can t static methods be overridden in Java  Can static methods be overloaded in Java

User · Answer

Static methods is a method whose single copy shared by all the objects of the class . Static method belongs to the class rather than objects .since static methods are not depend on the objects , Java Compiler need not wait till the objects creation .so to call static method we uses syntax like ClassName.method() ;

In case of method overloading , methods should be in the same class to overload .even if they are declared as static it is possible to overload them as ,

   Class Sample
    {
         static int calculate(int a,int b,int c)
           {
                int res = a+b+c;
                return res;
           }
           static int calculate(int a,int b)
           {
                int res = a*b;
                return res;
           }
}
class Test
{
   public static void main(String []args)
   {
     int res = Sample.calculate(10,20,30);
   }
}

But in case of method overriding , the method in the super class and the method in the sub class act as different method . the super class will have its own copy and the sub class will have its own copy so it does not come under method overriding .

User · Answer

I design a code of static method overriding I think It is override easily Please clear me how its unable to override static members Here is my code-  class Class1       public static int Method1              System out println  true              return 0          class Class2 extends Class1       public static int Method1       System out println  false              return 1           public class Mai       public static void main String   args              Class2 c new Class2                Must explicitly chose Method1 from Class1 or Class2             Class1 Method1              c Method1

User · Answer

Definitely  we cannot override static methods in Java   Because JVM resolves correct overridden method based upon the object at run-time by using dynamic binding in Java   However  the static method in Java is associated with Class rather than the object and resolved and bonded during compile time

User · Answer

Static methods can not be overridden in the exact sense of the word  but they can hide parent static methods  In practice it means that the compiler will decide which method to execute at the compile time  and not at the runtime  as it does with overridden instance methods   For a neat example have a look here   And this is java documentation explaining the difference between overriding instance methods and hiding class  static  methods      Overriding  Overriding in Java simply means that the particular method would be called based on the run time type of the object and   not on the compile time type of it  which is the case with overriden   static methods       Hiding  Parent class methods that are static are not part of a child class  although they are accessible   so there is no question of   overriding it  Even if you add another static method in a subclass    identical to the one in its parent class  this subclass static method   is unique and distinct from the static method in its parent class

User · Answer

Overloading is also called static binding  so as soon as the word static is used it means a static method cannot show run-time polymorphism   We cannot override a static method but presence of different implementations of the same static method in a super class and its sub class is valid  Its just that the derived class will hide the implementations of the base class   For static methods  the method call depends on the type of reference and not which object is being referred  i e  Static method belongs only to a class and not its instances   so the method call is decided at the compile time itself   Whereas in case of method overloading static methods can be overloaded iff they have diff number or types of parameters  If two methods have the same name and the same parameter list then they cannot be defined different only by using the  static  keyword

User · Answer

From Why doesn t Java allow overriding of static methods   Overriding depends on having an instance of a class  The point of polymorphism is that you can subclass a class and the objects implementing those subclasses will have different behaviors for the same methods defined in the superclass  and overridden in the subclasses   A static method is not associated with any instance of a class so the concept is not applicable  There were two considerations driving Java s design that impacted this  One was a concern with performance  there had been a lot of criticism of Smalltalk about it being too slow  garbage collection and polymorphic calls being part of that  and Java s creators were determined to avoid that  Another was the decision that the target audience for Java was C   developers  Making static methods work the way they do have the benefit of familiarity for C   programmers and were also very fast because there s no need to wait until runtime to figure out which method to call

User · Answer

Static methods cannot be overridden because they are not dispatched on the object instance at runtime  The compiler decides which method gets called   This is why you get a compiler warning when you write   MyClass myObject   new MyClass     myObject myStaticMethod        should be written as  MyClass myStaticMethod       because it is not dispatched on myObject  myObject   new MySubClass     myObject myStaticMethod         still calls the static method in MyClass  NOT in MySubClass   Static methods can be overloaded  meaning that you can have the same method name for several methods as long as they have different parameter types     Integer parseInt  10     Integer parseInt  AA   16

User · Answer

Static methods can not be overridden because there is nothing to override  as they would be two different methods  For example  static class Class1       public static int Method1              return 0          static class Class2 extends Class1       public static int Method1              return 1           public static class Main       public static void main String   args               Must explicitly chose Method1 from Class1 or Class2           Class1 Method1              Class2 Method1              And yes static methods can be overloaded just like any other method

User · Answer

You can overload a static method but you can t override a static method  Actually you can rewrite a static method in subclasses but this is not called a override because override should be related to polymorphism and dynamic binding  The static method belongs to the class so has nothing to do with those concepts  The rewrite of static method is more like a shadowing

User · Answer

class SuperType        public static void  classMethod            System out println  Super type class method              public void instancemethod            System out println  Super Type instance method              public class SubType extends SuperType        public static void classMethod            System out println  Sub type class method              public void instancemethod            System out println  Sub Type instance method              public static void main String args             SubType s new SubType            SuperType su s          SuperType classMethod      Prints     Super type class method         su classMethod        Prints     Super type class method         SubType classMethod      Prints     Sub type class method            This example for static method overriding  Note  if we call a static method with object reference  then reference type class  static method will be called  not object class static method   Static method belongs to class only

User · Answer

If I m calling the method by using SubClass name MysubClass then subclass method display what it means static method can be overridden or not  class MyClass       static void myStaticMethod             System out println  Im in sta1             class MySubClass extends MyClass        static void  myStaticMethod             System out println  Im in sta123             public class My       public static void main String arg               MyClass myObject   new MyClass            myObject myStaticMethod               should be written as         MyClass myStaticMethod               calling from subclass name         MySubClass myStaticMethod            myObject   new MySubClass            myObject myStaticMethod                still calls the static method in MyClass  NOT in MySubClass

User · Answer

As any static method is part of class not instance so it is not possible to override static method

User · Answer

No  you cannot override a static method  The static resolves against the class  not the instance    public class Parent        public static String getCName              return  I am the parent               public class Child extends Parent        public static String getCName              return  I am the child                Each class has a static method getCName    When you call on the Class name it behaves as you would expect and each returns the expected value     Test  public void testGetCNameOnClass          assertThat Parent getCName    is  I am the parent          assertThat Child getCName    is  I am the child           No surprises in this unit test  But this is not overriding This declaring something that has a name collision    If we try to reach the static from an instance of the class  not a good practice   then it really shows    private Parent cp   new Child      enter code here  assertThat cp getCName    is  I am the parent        Even though cp is a Child  the static is resolved through the declared type  Parent  instead of the actual type of the object  For non-statics  this is resolved correctly because a non-static method can override a method of its parent

User · Answer

It   s actually pretty simple to understand     Everything that is marked static belongs to the class only  for example static method cannot be inherited in the sub class because they belong to the class in which they have been declared  Refer static keyword   The best answer i found of this question is      http   www geeksforgeeks org can-we-overload-or-override-static-methods-in-java

User · Answer

static methods are class level methods   Hiding concept is used for static methods   See   http   www coderanch com how-to java OverridingVsHiding

User · Answer

The very purpose of using the static method is to  access the method of a class without creating an instance for it It will make no sense if we override that method since they will be accessed by classname method

User · Answer

Static methods can not be overridden because they are not part of the object s state   Rather  they belongs to the class  i e they are class methods    It is ok to overload static  and final  methods

User · Answer

No Static methods can t be overriden as it is part of a class rather than an object  But one can overload static method

User · Answer

Parent class methods that are static are not part of a child class  although they are accessible   so there is no question of overriding it   Even if you add another static method in a subclass  identical to the one in its parent class  this subclass static method is unique and distinct from the static method in its parent class

[java] Can I override and overload static methods in Java?

Examples related to java

Examples related to static

Examples related to overloading

Examples related to overriding