Java program to from a new word by extracting the first letter of each word in the entered sentence

Write a Java program to from a new word by extracting the first letter of each word in the entered sentence.

import java.util.*;
class FirstLetter 
{
    public static void main(String arr[])
    {
	Scanner sc=new Scanner(System.in);
	System.out.println("Enter any String");
	String s=sc.nextLine();
	int len=s.length();
	char a;
	String s2="";
	s2=s2+s.charAt(0);
	for(int i=1; i<len; i++)
	{
	    a=s.charAt(i);
	    if(a==' ')
	    {
	        s2=s2+(s.charAt(i+1));
	    }
	}
	System.out.println("The new word : "+s2);
    }
}