what is problem??

package com.codegym.task.task09.task0902; /* Stack trace revisited */ public class Solution { public static void main(String[] args) throws Exception { method1(); } public static String method1() { method2(); //write your code here //System.out.println(Thread.currentThread().getStackTrace()[0].getMethodName()); return Thread.currentThread().getStackTrace()[0].getMethodName(); } public static String method2() { method3(); //write your code here //System.out.println(Thread.currentThread().getStackTrace()[1].getMethodName()); return Thread.currentThread().getStackTrace()[1].getMethodName(); } public static String method3() { method4(); //write your code here //System.out.println(Thread.currentThread().getStackTrace()[2].getMethodName()); return Thread.currentThread().getStackTrace()[2].getMethodName(); } public static String method4() { method5(); //write your code here //System.out.println(Thread.currentThread().getStackTrace()[3].getMethodName()); return Thread.currentThread().getStackTrace()[3].getMethodName(); } public static String method5() { //write your code here //System.out.println(Thread.currentThread().getStackTrace()[4].getMethodName()); return Thread.currentThread().getStackTrace()[4].getMethodName(); } }