Garbage collection overview in Java - Interactive Code Practice

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Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new object that will be eligible for garbage collection.

Java

MyObject obj = new [1](); obj = null;

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AMyObject

BInteger

CString

DObject

Attempts:

3 left

2fill in blank

medium

Complete the code to explicitly request garbage collection.

Java

System.[1]();

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ArunFinalization

Bgc

Cexit

DcollectGarbage

Attempts:

3 left

3fill in blank

hard

Fix the error in the code to avoid preventing garbage collection.

Java

MyObject obj = new MyObject();
obj.[1] = obj;

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Athis

BselfReference

Creference

Dparent

Attempts:

3 left

4fill in blank

hard

Fill both blanks to create a weak reference that allows garbage collection.

Java

WeakReference<MyObject> weakRef = new WeakReference<[1]>(obj);
obj = [2];

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AMyObject

Bnull

CObject

Dnew MyObject()

Attempts:

3 left

5fill in blank

hard

Fill all three blanks to implement a finalize method that prints a message before garbage collection.

Java

protected void [1]() throws [2] {
    System.out.[3]("Object is being garbage collected");
}

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Afinalize

BThrowable

Cprintln

Dprint

Attempts:

3 left