Java MCQ on Objects and Classes | Mock OCJP

Java multiple choice questions on Objects and Classes. Free online self-assessment test on Java programming language to evaluate the understanding of Java basics for beginners. First test from the Java online test series. These mock test series on Java programming language consisting of a wide range of multiple-choice questions are designed to evaluate the self-performance of Java skills. Very useful in interviews and OCJP certification exam preparation.

Java Online Mock OCJP Test Series: 1

Topic- Objects and Classes in Java

The test consists of 14 questions on Java.

No negative marking for this test.

No Time limit

The pass percentage is 70%

The correct answer with a description will be displayed after the answer has been marked.

Submit the test to calculate your score once you are done with all the questions.

Complexity Level- Easy

Q1: Select the correct output for the below code snippet:

public class abc {
int i;
public int a(int x){
i=x+1;
System.out.println("Value of i="+i);
return i;
}
}

public class xyz {
abc obj1,obj2;

public xyz(){
obj1=new abc();
obj2=obj1;
obj2.a(3);
}
public static void main(String[] args) {
xyz x=new xyz();
}
}

Null pointer exception

Print on the console: 'value of i=4'

Print on the console: 'value of i=3'

Q2: A reference variable in Java is _________

Select the correct answer:

A variable referring or pointing to an object of a class

An alias to the instance variable of the class

None of the above

Q3: An instance variable in Java is _______

An alias to a reference variable of a class

A variable belonging to the class and can be accessed through the class name

A variable belonging to an instance of a class and can be accessed through the reference variable of the class

Q4: A static variable in Java is _______

A variable belonging to an instance of a class and can be accessed by the reference variable of the class

A variable belonging to a class and can be accessed by the class name

None of the above

Q5: Select all that applies for a nested static member class:

A static member class can access only static members of its enclosing class

A static member class can define only static members in it

A static member class can define both static as well as non-static members in it

No enclosing instance is required to instantiate a static member class

Instance of the enclosing class is required to instantiate a static member class

static keyword is required to define a nested static member class

Q6: An anonymous class in Java is _____?

Select the correct answer:

A type of inner class without a name

A class without a definition

An abstract class

Q7: Garbage collection in Java is _____

Initialization of unused local variables

Reclaiming the memory occupied by the object that is no longer referenced by any reference variable

Assigning null to reference variables

Q8: Object Finalization in Java is __________

Apply final keyword before the object declaration

The last resort for an object to perform some tasks before it is being garbage collected

Making an object of the final class

Q9: A final class in java is _______

Select the correct answer:

A class that cannot be extended

A class that cannot be instantiated

None of the above

Q 10: An abstract class cannot be instantiated:

Select True or False:

True

False

Q 11: System.gc() is a method used to _______

Invoke garbage collection explicitly

Invoke object finalization

None of the above

Q 12: Select all that applies for a nested Non-static member class:

A non-static member class can only be instantiated using an instance of its enclosing class

Non-static member classes are inner classes that are defined without the keyword static

No instance of enclosing class is required to instantiate a non static member class

A non-static member class cannot define static members inside it

A non-static member class can define static as well as non-static members inside it

A non-static member class can access all the members of its enclosing class including static as well as non-static

A non-static member class can access only non-static members of its enclosing class

Q 13: An object in java can be referenced by multiple reference variables:

Select True or False

True

False

Q 14: A local class in java is ________

A class having all its methods as abstract

A class having all the members belonging to a method or a block

A type of inner class specified inside a block for e.g. inside a constructor, a method, or an initializer

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Java MCQ on Objects and Classes | Mock OCJP

Quantitative aptitude - practice tests