Meaning of instanceof in Java

Question

I wrote below program but I am not able to understand the output.

public class Test {

    public static void main(String[] args) {
        int[] a = new int[5];
        System.out.println(a instanceof Object);
    }

}

Thanks for clarification. Now, I understand the concept of instanceof operator. — Ravish Jain, Nov 18 '17 at 18:33

score 0 · Answer 1 · answered Nov 18 '17 at 18:29

0

It will output True. Instanceof checks if the left one is from the class at the right of instanceof. Every class is subclass of Object class in Java so here it evaluates true.

answered Nov 18 '17 at 18:29

Alan Ajax

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score 0 · Accepted Answer · answered Nov 18 '17 at 18:29

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Arrays, even if they're arrays of primitives, are objects, so the program outputs true.

answered Nov 18 '17 at 18:29

Mureinik

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score 0 · Answer 3 · answered Nov 18 '17 at 18:31

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Besides checking class assignance, instanceof also check for the SuperClasses of the left side.

In your case the Array extends Object is a instanceof Object

answered Nov 18 '17 at 18:31

Marcos Vasconcelos

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Meaning of instanceof in Java

3 Answers3