Write a Java program to create a new string taking first three characters from a given string

import java.lang.*;
 public class Exercise72 {
 public static void main(String[] args)
 {
    String str1 = "";    
	int len = str1.length();
	if(len >= 3)
		System.out.println( str1.substring(0, 3));
	else if(len == 1)
		System.out.println( (str1.charAt(0)+"##"));
	else
		System.out.println("###");
	}
}

Sample Output:

###