Compare the elements of an array (Java)

public class ArrayTest {
	public static void main(String[] args) {
		String[] array = {"AIUEO", "AIUEO", "Kakikukeko", null, null};
		for (int i = 0; i < array.length-1; i++){
			if (array[i] == array[i+1]) {
				if (array[i] == null) {
					System.out.println(array[i]+"When"+array[i+1]+"Are both NULL");
				} else {
					System.out.println(array[i]+"When"+array[i+1]+"Is the same");
				}
			} else {
				if (array[i] == null || array[i+1] == null) {
					System.out.println(array[i]+"When"+array[i+1]+"Is one null");
				} else {
					System.out.println(array[i]+"When"+array[i+1]+"Different");
				}
			}
		}
	}
}

Aiueo and Aiueo are the same
Aiueo Tokaki Kukeko is different
One of Kakikukeko and null is NULL
Both null and null are null

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