Skip to main content

Method Overloading-1

Method Overloading:-Method overloading or function overloading is another great feature of java which is very helpful for the application development, in this feature a single function performed multiple task. In method overloading function name must be same and parameter must be different. For function overloading there is no rule for return type so return type may be different.
If a function perform more than one task, called overloaded function in function overloading function signature must be different. Function overloading is done on the basis of reference and function resolution or function binding is done at the compile time.
Function overloading also known as compile time polymorphism or static binding or early binding.

 Example1:-

class Student
{
void disp()
{
System.out.println("This is zero argument disp");
}
void disp(int a)
{
System.out.println("This is int argument disp");
}
void disp(char a)
{
System.out.println("This is char argument disp");
}
}
class Test
{
public static void main(String[]args)
{
Student s=new Student();
s.disp();
s.disp(100);
s.disp('A');
}
}

Output:-

C:\JAVATECH>javac Test.java
C:\JAVATECH>java Test
This is zero argument disp
This is int argument disp
This is char argument disp

Example2:-

class Student
{
void disp(int a,long b)
{
System.out.println("This is Two argument disp");
}
void disp(long a,int b)
{
System.out.println("This is Two argument disp");
}
}
class Test
{
public static void main(String[]args)
{
Student s=new Student();
s.disp(100,200);
s.disp(100,200);
}
}

Output:-

C:\JAVATECH>javac Test.java
Test.java:21: error: reference to disp is ambiguous
s.disp(100,200);
 ^
  both method disp(int,long) in Student and method disp(long,int) in Student mat
ch
Test.java:22: error: reference to disp is ambiguous
s.disp(100,200);
 ^
  both method disp(int,long) in Student and method disp(long,int) in Student mat
ch
2 errors


Example3:-


class Student
{
void disp(int a,long b)
{
System.out.println("This is Two[int,long] argument disp");
}
void disp(long a,int b)
{
System.out.println("This is Two[long,int] argument disp");
}
}
class Test
{
public static void main(String[]args)
{
Student s=new Student();
s.disp(100l,200);
s.disp(100,200l);
}
}

Output:-

C:\JAVATECH>javac Test.java
C:\JAVATECH>java Test
This is Two[long,int] argument disp
This is Two[int,long] argument disp


Example4:-


class Student
{
void disp(int a,long b)
{
System.out.println("This is Two[int,long] argument disp");
}
void disp(long a,int b)
{
System.out.println("This is Two[long,int] argument disp");
}

}
class Test
{
public static void main(String[]args)
{
Student s=new Student();
s.disp(100L,200);
s.disp(100,200L);
}
}

Output:-

C:\JAVATECH>javac Test.java
C:\JAVATECH>java Test
This is Two[long,int] argument disp
This is Two[int,long] argument disp

Example5:-


class Student
{
void disp(int a,long b)
{
System.out.println("This is Two[int,long] argument disp");
}
void disp(long a,int b)
{
System.out.println("This is Two[long,int] argument disp");
}
}
class Test
{
public static void main(String[]args)
{
Student s=new Student();
s.disp(100,200);
s.disp(100,200L);
}
}

Output:-

C:\JAVATECH>javac Test.java
Test.java:18: error: reference to disp is ambiguous
s.disp(100,200);
 ^
  both method disp(int,long) in Student and method disp(long,int) in Student mat
ch

1 error
Labels:

Comments

Post a Comment

Popular posts from this blog

Inner classes

Inner Classes:- class inside class or interface called inner class or nested class. Advantage of inner classes is grouping multiple classes and interfaces into a single class. Another big advantage of inner class is that inner class can happily access all the data or variables of outer class directly. Types of Nested classes:- There are two types of nested classes static and non-static nested classes. (A)Non –static inner classes:- 1)     Member inner class 2)     Anonymous inner class 3)     Local inner class (B)Static nested class Example1:-Outer.java class Outer { class Inner { void disp() { System.out.println("Hello This is Inner class Method"); } } public static void main(String[]args) { Inner in=new Inner(); in.disp(); } } Output:- C:\JAVATECH>javac Outer.java Outer.java:12: error: non-static variable this cannot be referenced from a static context Inner in=new Inner(); ...
Post a Comment
Read more

Inheritance-4

Example10:- class Student { Student() { System.out.println("This is super class Zero argument constructor"); } Student(String s) { System.out.println("This is super class One argument constructor"); } } class Test extends Student { Test() { super(null); System.out.println("This is sub class Zero argument constructor"); } public static void main(String[]args) { Test t=new Test(); } } Output:- C:\JAVATECH>javac Test.java C:\JAVATECH>java Test This is super class One argument constructor This is sub class Zero argument constructor Example11:- class Student { Student() { System.out.println("This is super class Zero argument constructor"); } Student(String s) { System.out.println("This is super class One argument constructor"); } } class Test extends Student { Test() { super(); super(null); System.out.println("This is su...
Post a Comment
Read more

Small concept about OOPs

Some small concept about OOPs:- In many books and website write about OOPs concepts as hundred percent object oriented, pure object oriented and partial object oriented language. Hundred percent object oriented:- In the hundred percent object oriented movie hero is object, without object program is incomplete that means can not execute program without object. Without class and object programming or application development is not possible. Example of hundred percent object oriented language is  Smalltalk . Pure object oriented:- In the object oriented cinema obviously object is the hero. In pure object oriented language object having same importance but in this having some relax that is without creating object we can successfully execute our application. So in the object oriented programming without class we cannot create or run our application, class is must. Example of pure object oriented language is  Java . Partial object oriented:- In this type of la...
Post a Comment
Read more