Java : string split

/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main (String[] args) throws java.lang.Exception
{
String s = "hai hello hai dude!";
String[] arr = new String[20];
arr = s.split(" ");
System.out.println("Hai" + s);
for (String w : arr)
{
System.out.println("h" + w);
}
}
}