Substring Of String Separated By Commas

I am trying for a logic that i have some emp ids as a string seperated by commas and i need the substring of emp ids as below. splitting the string as below.

public static void main(String args[]) {                 
String empId = "1,2,3,4,5,6,7,8,9,10";       
int i;
int count = 9;
for (i = 0; i <= count; i = i + 3) {            
System.out.println("Emp IDs are : " +empId);          
}}

Result is:

Emp IDs are : 1,2,3,4,5,6,7,8,9,10
Emp IDs are : 1,2,3,4,5,6,7,8,9,10
Emp IDs are : 1,2,3,4,5,6,7,8,9,10
Emp IDs are : 1,2,3,4,5,6,7,8,9,10
 
But I want the result like:

Emp IDs are : 1,2,3
Emp IDs are : 4,5,6
Emp IDs are : 7,8,9
Emp IDs are : 10