Check out example codes for "check if all characters in a string are the same java". It will help you in understanding the concepts better.

Code Example 1

// Java program to find whether the String 
// has all same characters or not. 
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)) 
// This Code is contributed by vt_m.

Learn ReactJs, React Native from