Variable Arguments (Varargs) in Java

• Variable Arguments (Varargs) was introduced in JDK 5.
• Varargs as the name suggest allows a function to be called with different number of arguments as per the requirement.
• The syntax of Varargs:

returntype methodname(datatype ...a)

• A method can have normal parameters and variable length parameters together but the only requirement is that varargs parameter should be written last in the parameter list of the method declaration.Example:

int nums(int a, float b, double  c)

Example of Variable Arguments (Varargs) in Java:

class Demo
{
    // Takes string as a argument followed by varargs
    static void fun2(String str, int ...a)
    {
        System.out.println("String: " + str);
        System.out.println("Number of arguments is: "+ a.length);
 
        // for each loop to display contents of a
        for (int i: a)
            System.out.print(i + " ");
 
        System.out.println();
    }
 
    public static void main(String args[])
    {
        // Calling fun2() with different parameter
        fun2("Test1", 100, 200);   
        fun2("Test2", 1, 2, 3, 4, 5);
        fun2("Test3");
    }
}

Output:

String: Test1
Number of arguments is: 2
100 200 
String: Test2
Number of arguments is: 5
1 2 3 4 5 
String: Test3
Number of arguments is: 0