public class Client { public static void main(String[] args) { // Interceptor interceptor = new Interceptor(); // System.out.println(interceptor.process()); String str="ss"; System.out.println(notEmpty(str)); } public static boolean isEmptyString(String str) { //return str == null || str.trim().length() == 0; return str == null || str.length() == 0; } public static boolean notEmpty(String str){ return !isEmptyString(str); } }