Java - Write code to check if a string is All Upper Case

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Requirements

Write code to check if a string is All Upper Case

Demo

import java.util.ArrayList;
import java.util.List;

public class Main{
    public static void main(String[] argv){
        String cs = "book2s.com";
        System.out.println(isAllUpperCase(cs));
    }/*from  w  ww  .j  av  a 2s  . c  o m*/
    
    public static boolean isAllUpperCase(String cs) {
        if (cs == null || isEmpty(cs)) {
            return false;
        }
        int sz = cs.length();
        for (int i = 0; i < sz; i++) {
            if (Character.isUpperCase(cs.charAt(i)) == false) {
                return false;
            }
        }
        return true;
    }
    
    public static boolean isEmpty(String chkStr) {
        if (chkStr == null) {
            return true;
        } else {
            return "".equals(chkStr.trim()) ? true : false;
        }
    }
}

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