check if all characters in a string are the same java

// Java program to find whether the String 
// has all same characters or not. 
import java.io.*; 
  
public class GFG{ 
  
static boolean allCharactersSame(String s) 
{ 
    int n = s.length(); 
    for (int i = 1; i < n; i++) 
        if (s.charAt(i) != s.charAt(0)) 
            return false; 
          
    return true; 
} 
  
// Driver code 
    static public void main (String[] args){ 
        String s = "aaa"; 
    if (allCharactersSame(s)) 
        System.out.println("Yes"); 
    else
        System.out.println("No"); 
          
    } 
} 
  
// This Code is contributed by vt_m.