import java.util.ArrayList;


public class arr {

	public String[] i;
	
	public static void main (String[] args) {

		ArrayList list = new ArrayList();
		
		list.add("hello");
		list.add("hello 			to 				you");
		list.add("I		Am		Another		Test!!");

		String i[] = (String[]) list.toArray(new String[0]);
		
		moo moo = new moo();		
	}
}
		


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public class moo {
	
	public moo() {
		arr arr = new arr();
		System.out.print(arr.i[0]);
	}
}

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Output: 

Exception in thread "main" java.lang.NullPointerException
        at moo.<init>(moo.java:6)
        at arr.main(arr.java:19)