Java Certification Practice Test – Java MCQ Questions and Answers

Practice Java certification-style MCQ questions and evaluate your readiness for Java interviews, certification exams, and campus placements. This quiz contains exam-oriented questions frequently asked in Java assessments.

The test includes output-based Java programs, syntax-related questions, object-oriented programming concepts, operators, control statements, classes, inheritance, and commonly tested Java fundamentals.

Unlike topic-specific Java quizzes, this practice test covers multiple Java concepts in a single assessment, making it useful for quick revision and self-evaluation before interviews or certification exams.

Why Practice Java Certification MCQ Questions?

Java certification exams and technical interviews often test conceptual understanding along with the ability to predict program output. Candidates are expected to understand Java syntax, object-oriented programming principles, operators, loops, methods, inheritance, polymorphism, exception handling, and collections.

Output-based questions are particularly common because they evaluate practical coding knowledge rather than memorized theory. Regular practice helps improve problem-solving speed and accuracy during real assessments.

This Java certification practice test provides a quick way to assess your strengths and identify topics that require additional study before appearing for interviews, certification exams, or campus recruitment drives.

Java certification exam mock test

The test consists of 10 questions

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- Moderate

Q1. What is wrong with the below Java program?

class testClass{

public static void main(String[] args) {
int a;
System.out.println(a);
}
}

The 'testClass' doesn't have any instance variables.

You are trying to use a local variable 'a' without it being initialized.

The class 'testClass' doesn't have any accessibility modifier.

Nothing wrong with the program.

Q2: What are the errors in the below java program?
public class xyz {

int a ;
final int b;
int c =4;
final String str = "hello world";

public void func() {

int d;
String localstring = "hello everyone";
str=localstring;
System.out.println(str);
System.out.println(d);
System.out.println(a);

}

}

Select all that applies.

You are changing the value of a final variable 'str' which is not allowed

You have not initialized the variable 'a'

You have not initialized the final field 'b' which is mandatory.

You have initialized the final field 'str' at the class level.

You are using local variable 'd' without it being initialized.

Q3. What is wrong with the below java program?

final class test1{

protected static int a;
}

class test2 extends test1{

public static void main(String[] args) {

System.out.println(a);
}
}

static variable 'a' is not initialized

final class 'test1' cannot be inherited

static variables are not allowed in a final class

There is nothing wrong with the program

Q4: What default value will be acquired by variable 'a' in the below java program?

class testClass{

static int a;
public static void main(String[] args) {
System.out.println(a);
}
}

0

1

121

None of the above.

Q5: Select the valid statements that can be inserted at position 1 of the below java program:

public class abc {

int a;
int b=0;
static int c;

public static void main(String[] args) {
int d;
int e=0;

//position 1
}
}

a++;

b++;

c++;

d++;

e++;

Q6: What will be the output of executing the below java program:

class testClass{

public static void main(String[] args) {

int i=4;
float f = 4.3;
double d = 1.8;
int c =0;

if(i == f)
c++;
if(((int)(f+d)) == ((int) f) + (int)d)
c+= 2;

System.out.println(c);
}
}

The value 0 will be written to the console output

The value 1 will be written to the console output

The value 2 will be written to the console output

The code will fail to compile

Q7: What is the execution result of the below java program?

interface inter{
void func();
}

class testClass implements inter{

public void func(){
System.out.println("hello world");
}

public static void main(String[] args) {
inter x = new inter();
x.func();
}
}

"hello world" will be written on the standard output

ArrayIndexOutOfBound error

Compilation error - Cannot instantiate an interface

Output cannot be determined

Q8: Determine the output of the execution of the below java program

public class xyz {
int a;

xyz(){
a=9;
}

xyz(int i){
a=i;
}

public static void main(String[] args) {
xyz obj1 = new xyz();
xyz obj2 = new xyz(10);
obj1=obj2;
System.out.println(obj1.a);
}
}

0 will be printed on the console output

9 will be printed on the console output

10 will be printed on the console output

Compilation error

Q9: The below program will give a compilation error - Unhandled exception type Exception

public class xyz {
int a;
xyz() throws Exception{
a=9;
}

xyz(int i){
a=i;
}

public static void main(String[] args) {
xyz obj1 = new xyz();
xyz obj2 = new xyz(10);
obj1=obj2;
System.out.println(obj1.a);
}
}

Select the statements that will remove the compilation error from the above program

Surround the main method with a try/catch block

Add a throws clause at the main method as below
public static void main(String[] args) throws Exception

Add a throws clause at the end of the first object creation statement as below
xyz obj1 = new xyz() throws Exception;

Surround the first object creation statement with a try/catch statement as below
try {
obj1 = new xyz();
} catch (Exception e) {
}

Q10: Select the statements that can be inserted at position -1, so that the method 'func()' can be invoked without any compilation error:

interface inter{
void func();
}

class testClass implements inter{
public void func(){
System.out.println("hello world");
}

public static void main(String[] args) {
//position - 1
x.func();
}
}

inter x = new testClass();

inter x = new inter();

testClass x = new testClass();

testClass x;

Frequently Asked Questions (FAQs)

What is a Java certification practice test?

A Java certification practice test is a collection of exam-style multiple-choice questions designed to help candidates prepare for Java certification exams, technical interviews, and campus recruitment assessments.

Does this quiz contain output-based Java questions?

Yes. The test includes output-based Java programs that help assess your understanding of Java syntax, operators, methods, loops, classes, and object-oriented programming concepts.

Is this Java MCQ test suitable for interview preparation?

Yes. Many questions commonly asked in Java interviews are conceptually similar to certification-style MCQs, making this quiz useful for interview preparation.

Which Java topics are covered in this practice test?

The quiz covers multiple Java topics including variables, operators, loops, methods, classes, inheritance, polymorphism, object-oriented programming, and program output analysis.

Can beginners attempt this Java certification quiz?

Yes. Beginners can use the quiz to assess their Java fundamentals, while experienced developers can use it as a quick revision tool before interviews and certification exams.

Java Certification Practice Test – Java MCQ Questions and Answers

Why Practice Java Certification MCQ Questions?

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