What makes java object eligible for garbage collect Yasser @Jobilize

Author: Yasser Ibrahim

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Question 96 / 297: What can be inserted at // insert code here, to make object created at line 5 eligible for garbage collection?

public static void main(String[] args) {
		
		Integer[] arr = new Integer[3];
		
		arr[0] = new Integer("3"); // Line 5
		
		Integer x = arr[0];
		
		// insert code here

}

A arr[0] = null;

B x = null;

C arr = null; x = new Integer(450);

D Any of the above

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Explanation:

There are two references to the object created at line 5, a[0] and x.

Nulling only "arr" or "arr[0]" or "x", or making them point to other objects, is not enough.

We need to detach all the references to this object.

So, to make the object eligible for garbage collection, we can either :

1) set "arr" to null or to other object and set "x" to null or other object

2) or set "arr[0]" to null or other object and set "x" to null to other object

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