How to compare between java wrappers Given Yasser Ibrahim @Jobilize

Author: Yasser Ibrahim

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Question 133 / 297: Given the following code fragment, what is true about the following System.out statements?

public class Tester {

	public static void main(String[] args) {
		Integer[][] arr1 = { { 1, 2 }, { 3, 4 } };
		Number[] arr2 = arr1[0];
		int x = 1;

		System.out.print(arr1[0][0] == 1);
		System.out.print(arr2[0] == x);
		System.out.print(x instanceof Integer);
		System.out.print(arr1[1][0] > (Integer) arr2[0]);
	}

}

A All statements will compile

B Only one will compile and will print true

C Only two statements will compile and both will print ture

D Only three statements will compile, only two of them will print true

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Explanation:

arr2[0]==x will not compile because of incompatible operand types (Number and int)

x instanceof Integer will not compile because of incompatible conditional operand types (int and Integer)

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