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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
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