Function Overloading

 function overloading happens two or more function with the same name  

with different parameters or arguments 

fun(34);

fun("hello");

static void sum(int a){

System.out.println(a)

}

static void sum(String a){

System.out.println(a);

}

At compile time it's decide which function to take 

no of argument should be different or no of type should be different