Java overload and override

Question

Suppose I have two methods in a class:

public void eat(int i,String s) and

public void eat(String s, int i)

what it is. Overload or override?

Answer 1

Overloading means two or more methods with the same name, but with different parameters, like your example. Instead of overriding, you implement a method from an interface or an abstract class, so the method of a superclass has an implementation, but in a subclass has different ones. However, they have the same method name and parameters.

Answer 2

This will be the method overload, since it satisfies the method overload conditions:

• Must have different argument lists
• May have different return types if the argument lists are also different
• There may be different access modifiers
• May throw different exceptions

In addition, redefinition can only occur during inheritance. Since both methods are in the same class, this cannot be overriding.

Answer 3

This is an overload. Overriding is used in inheritance when you give another implementation of the same method signature.

Answer 4

This overload. In short:
Overriding = replacement Overload = providing additional parameters

Answer 5

Type of rules for overloading and redefinition:

1. Constructors can be overloaded, but cannot be overridden.
2. Abstract methods must be overridden by the first concrete subclass.
3. The main method:
   • must have the same argument list
   • must have the same return type (this can also be a subclass of the return type of the parent class,
   • should not have a more restrictive access modifier,
   • may have a less restrictive access modifier,
   • should not throw new or wider checked exceptions,
   • can generate fewer or already checked exceptions, or any unchecked exception.
4. final methods cannot be overridden.
5. Only inherited methods can be overridden, and remember that private methods are not inherited.
6. In a subclass, use: super.overriddenMethodName () to call the overridden method of the superclass.
7. Overloaded methods:
   • must have different argument lists
   • can have different return types if the argument lists are also different,
   • may have different access modifiers,
   • may throw various exceptions.
8. Methods from a superclass can be overloaded in a subclass.
9. Polymorphism refers to overriding, but not to overloading.
10. The type of object (not the type of the reference variable) determines which overridden method is used at run time.
11. The type of reference determines which overloaded method will be used at compile time.

* Obtained from a Sun Certified Sun Programmer for Java 6 Study Guide from Katie Seirra, Burt Bates.

Answer 6

Method overloading simply means providing two separate methods in the class with the same name but different arguments, while the return type of the method may or may not differ, which allows us to reuse the same method name.

Overriding a method means defining a method in a child class that is already defined in the parent class with the same method signature, that is, with the same name, arguments, and return type.

The difference between method overloading and method overriding

For more details, you can read all about method overloading and method overrides .

Answer 7

Property ------------------- OverLoading -------------------- Override

Method names --------------> must be the same --------------------> must be the same

Arg types ------------------> must be different (atleast arg) ----> must be the same (including order)

Method signature -----------> must be different (atleast arg) ----> must be the same (including order)

Return Type ----------------> No limit -------------------> No limit

Private, static, final -------> No limit --------------------> Must be the same

Access modifier ------------> Unlimited -------------------- Same

try / Catch -----------------> No Restriction -------------------- Exception thrown

Method resolution --------> Compiler time (link) -------- (JVM) Runtime pimorphism

Answer 8

OVERLOAD:

• Two or more methods with the same name but different parameters in the same class. Just like the situation with your question.

  public void eat (int i, String s)

  public void eat (String s, int i)

So, in your case, this is the Overloading method.

PREVAILING:

• Overriding means the presence of two methods with the same name and parameters (i.e. the signature of the method). One of the methods is in the parent class, and the other is in the child class.

ex.

 class Animal{ void eat(){System.out.println("eating...");} } class Dog extends Animal{ void eat(){System.out.println("eating bread...");} } 

Answer 9

In this particular case, this is overload .

Let’s differentiate both terms a little

Overload (same function name, but different signature):

• Two or more methods with the same name with different arguments in the same class.
• Overloading is used when you want to extend the functionality of a class.
• Overloading is a compile-time polymorphism.

Override (same function with same signature):

• Two or more methods that have the same method name and the same arguments in the parent and child classes.
• Override is used when you want to reuse existing functionality.
• Overriding is runtime polymorphism.

Visit to find out more about overloading and redefinition .