Friday, 25 November 2016

Demonstrate use of 'varagrs' in Java

The varargs is variable length arguments that allows the method to accept zero or multiple arguments. Before varargs either we use overloaded method or take an array as the method parameter. If we don't know how many argument we will have to pass in the method, varargs is the better approach. The main advantage of is that we don't have to provide overloaded methods as a result so less code. The syntax for varargs is given below:
return_type    method_name( data_type...    variable-name){
 .
 .
}  

Note that you have to insert three dots(...) after data type.

In program we have create a method sum( ) which gets variable length arguments. Then we call sum( ) method in main( ) method by providing different number of arguments.


PROGRAM
class VarArgsDemo {

 public static void sum(int... a) {
  
  int sum=0;
  for(int i=0;i<a.length;i++) {
   
   sum+=a[i];
  }
  System.out.println("The sum is "+sum);
 }

 public static void main(String[] args) {
 
  sum(1,2,4,5);
  sum(1,2);
  sum();
 }
}
OUTPUT
C:\>javac VarArgsConstDemo.java
C:\>java VarArgsConstDemo
The sum is 10
The sum is 30
The sum is 60

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