Whenever I try to run this code, I get this:
java.lang.NullPointerException
at com.codegym.task.task07.task0716.Solution.main(Solution.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
even though I never changed/edited CodeGym's original code. Why isn't this working?
package com.codegym.task.task07.task0716;
import java.util.ArrayList;
/*
R or L
*/
public class Solution {
public static void main(String[] args) throws Exception {
ArrayList<String> list = new ArrayList<String>();
list.add("rose"); // 0
list.add("love"); // 1
list.add("lyre"); // 2
list = fix(list);
for (String a : list) {
System.out.println(a);
}
}
public static ArrayList<String> fix(ArrayList<String> list) {
// write your code here
for(int i=0; i< list.size(); i++){
String s = list.get(i);
if(s.contains("r") && s.contains("l")){
}
else if(s.contains("r")){
list.remove(i);
}
else if(s.contains("l")){
list.add(s);
}
else{
}
}
return null;
}
}