NullPointerException

[rokit boy]

Why does it happen? Code:

package org.Bart.Tests.AI;

import java.io.*;

public class Main {
	public static void print(String a) {
		System.out.println(a);
	}
	public static void main(String[] args) {
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		String input;
		String[] brain;
		brain = new String[30000];
		brain[0] = "Hello|Hi";
		print("Hello, welcome to my failish AI");
		try {
			input = reader.readLine();
			for (String thing : brain) {
				thing.substring(0,thing.indexOf("|") );
				thing.toLowerCase();
				if (thing.contains(input)) {
					print("Found it!");
				}
			}
		} catch (IOException e) {
			print("You suck at typing");
		}
	}
}

I have no Idea why it errors.

[pbrockway2]

I have no Idea why it errors.

The stacktrace will tell you why the error occurs. What is the stacktrace? And which lines of your code does it refer to?

[rokit boy]

Line 19

[DarrylBurke]

Moved from Advanced Java. Inability to resolve a rather obvious NPE is in no way an advanced topic.

db

[DarrylBurke]

Hint: What's the default value of an element of an array of any reference type?

db

[rokit boy]

null?

[DarrylBurke]

Next hint: What happens when you attempt to invoke a method call on a reference that has a null value?

db

[rokit boy]

It thorws a null pointer exception.

[rokit boy]

sOLVED, LOCK THIS THREAD PLEASE