assertSame and assertNotSame in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if two references point to the same object using JUnit.

JUnit

assert[1](obj1, obj2);

Drag options to blanks, or click blank then click option'

AassertSame

BassertNotNull

CassertEquals

DassertTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertEquals instead of assertSame, which checks value equality, not reference equality.

assertSame checks if both references point to the exact same object in memory.

2fill in blank

medium

Complete the code to verify that two references do NOT point to the same object using JUnit.

JUnit

assert[1](objA, objB);

Drag options to blanks, or click blank then click option'

AassertNotSame

BassertFalse

CassertNull

DassertEquals

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertEquals or assertFalse which do not check reference identity.

assertNotSame checks that two references do not point to the same object.

3fill in blank

hard

Fix the error in the assertion that checks if two objects are the same instance.

JUnit

assertSame([1], obj);

Drag options to blanks, or click blank then click option'

Aobj.hashCode()

Bobj.equals(obj2)

Cobj1

Dobj.toString()

Attempts:

3 left

💡 Hint

Common Mistakes

Passing method calls like obj.equals() or obj.toString() instead of object references.

The first argument must be a reference to an object, not a method call or value.

4fill in blank

hard

Fill both blanks to assert that two variables do NOT refer to the same object and provide a failure message.

JUnit

assert[1]("Objects should not be same", [2], obj2);

Drag options to blanks, or click blank then click option'

AassertNotSame

BassertSame

Cobj1

Dobj3

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertSame instead of assertNotSame.

Passing the wrong object reference.

assertNotSame with a message checks that obj1 and obj2 are different objects.

5fill in blank

hard

Fill all three blanks to assert that two objects are the same instance with a custom failure message.

JUnit

assert[1]("Failure: objects differ", [2], [3]);

Drag options to blanks, or click blank then click option'

AassertEquals

BobjA

CobjB

DassertSame

Attempts:

3 left

💡 Hint

Common Mistakes

Using assertEquals instead of assertSame.

Swapping the order of object references.

assertSame with a message checks that objA and objB are the exact same object.