Java Programming Concepts and Logic Quiz

Test your Java knowledge with questions on primitives, keywords, outputs, exceptions & more. Ready to challenge yourself?

Practice Learn Test

Which of the following is a primitive data type in Java?

String

Array

Integer

Object

1 answered

What is the result of 9 % 4 in Java?

1 answered

What is the default value of a boolean variable in Java?

true

false

1 answered

What is the purpose of the 'super' keyword in Java?

To call the superclass constructor

To reference the current object

To create an object of a class

To call a method from the superclass

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int i = 0;
while (i < 3) {
System.out.print(i + " ");
i++;
}
}
}

0 1 2

1 2 3

0 1 2 3

Compilation Error

What does the 'static' keyword mean in Java?

It indicates a variable that can be changed

It indicates a method or variable that belongs to the class itself, rather than instances of the class

It indicates a method that cannot be accessed

It indicates a method that is executed only once

1 answered

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int x = 5;
System.out.println(x++);
}
}

Compilation Error

Runtime Error

1 answered

What is the purpose of the 'break' statement in Java?

To terminate a loop or switch statement

To skip the current iteration of a loop

To continue to the next iteration of a loop

To define the end of a method

1 answered

What does the 'this' keyword refer to in Java?

The current class instance

The superclass of the current class

A reference to another object

A reserved keyword for future use

#10

What is the output of the following code?

public class Main {
public static void main(String[] args) {
String str = null;
System.out.println(str.length());
}
}

NullPointerException

Compilation Error

Runtime Error

#11

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int x = 6;
if (x > 5) {
System.out.println("Hello");
} else {
System.out.println("World");
}
}
}

Hello

World

Compilation Error

Runtime Error

#12

Which of the following is true about Java packages?

A package can contain classes, interfaces, enumerations, and annotations

A package can only contain classes

A package can only contain interfaces

A package cannot contain any Java elements

#13

What is method overloading in Java?

Defining multiple methods with the same name but different parameters

Defining multiple methods with the same name and same parameters

Defining multiple methods with different return types

Defining multiple methods with different access modifiers

#14

What does the 'transient' keyword do in Java?

It specifies that a variable should not be serialized

It specifies that a variable should be serialized

It specifies that a variable should be made public

It specifies that a variable should be declared static

#15

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int i = 10;
do {
System.out.print(i + " ");
i--;
} while (i > 0);
}
}

10 9 8 7 6 5 4 3 2 1

10 9 8 7 6 5 4 3 2 1 0

9 8 7 6 5 4 3 2 1

Compilation Error

#16

What is a Java interface?

A class that cannot be instantiated

A blueprint of a class

A collection of abstract methods

A subclass of a superclass

1 answered

#17

What is the purpose of the 'finally' block in Java exception handling?

To catch exceptions

To handle exceptions

To execute code after try-catch blocks, regardless of whether an exception occurs or not

To specify custom exceptions

1 answered

#18

What is the difference between '==', 'equals()', and 'compareTo()' methods in Java?

'==' compares object references, 'equals()' compares object contents, 'compareTo()' compares values of comparable objects

'==' compares object references, 'equals()' compares values of comparable objects, 'compareTo()' compares object contents

'==' compares values of comparable objects, 'equals()' compares object references, 'compareTo()' compares object contents

'==' compares values of comparable objects, 'equals()' compares object contents, 'compareTo()' compares object references

1 answered

#19

What is the purpose of the 'volatile' keyword in Java?

To indicate that a variable's value may be changed by multiple threads

To prevent a variable from being modified by multiple threads

To indicate that a variable cannot be accessed by multiple threads

To optimize the performance of multithreaded applications

Java Programming Concepts and Logic Quiz

Which of the following is a primitive data type in Java?

What is the result of 9 % 4 in Java?

What is the default value of a boolean variable in Java?

What is the purpose of the 'super' keyword in Java?

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int i = 0;
while (i < 3) {
System.out.print(i + " ");
i++;
}
}
}

What does the 'static' keyword mean in Java?

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int x = 5;
System.out.println(x++);
}
}

What is the purpose of the 'break' statement in Java?

What does the 'this' keyword refer to in Java?

What is the output of the following code?

public class Main {
public static void main(String[] args) {
String str = null;
System.out.println(str.length());
}
}

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int x = 6;
if (x > 5) {
System.out.println("Hello");
} else {
System.out.println("World");
}
}
}

Which of the following is true about Java packages?

What is method overloading in Java?

What does the 'transient' keyword do in Java?

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int i = 10;
do {
System.out.print(i + " ");
i--;
} while (i > 0);
}
}

What is a Java interface?

What is the purpose of the 'finally' block in Java exception handling?

What is the difference between '==', 'equals()', and 'compareTo()' methods in Java?

What is the purpose of the 'volatile' keyword in Java?

Quiz Questions with Answers

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Java Programming Concepts and Logic Quiz

Which of the following is a primitive data type in Java?

What is the result of 9 % 4 in Java?

What is the default value of a boolean variable in Java?

What is the purpose of the 'super' keyword in Java?

What is the output of the following code?public class Main { public static void main(String[] args) { int i = 0; while (i < 3) { System.out.print(i + " "); i++; } }}

What does the 'static' keyword mean in Java?

What is the output of the following code?public class Main { public static void main(String[] args) { int x = 5; System.out.println(x++); }}

What is the purpose of the 'break' statement in Java?

What does the 'this' keyword refer to in Java?

What is the output of the following code?public class Main { public static void main(String[] args) { String str = null; System.out.println(str.length()); }}

What is the output of the following code?public class Main { public static void main(String[] args) { int x = 6; if (x > 5) { System.out.println("Hello"); } else { System.out.println("World"); } }}

Which of the following is true about Java packages?

What is method overloading in Java?

What does the 'transient' keyword do in Java?

What is the output of the following code?public class Main { public static void main(String[] args) { int i = 10; do { System.out.print(i + " "); i--; } while (i > 0); }}

What is a Java interface?

What is the purpose of the 'finally' block in Java exception handling?

What is the difference between '==', 'equals()', and 'compareTo()' methods in Java?

What is the purpose of the 'volatile' keyword in Java?

Quiz Questions with Answers

Test Your Knowledge

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Other Quizzes to Explore

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int i = 0;
while (i < 3) {
System.out.print(i + " ");
i++;
}
}
}

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int x = 5;
System.out.println(x++);
}
}

What is the output of the following code?

public class Main {
public static void main(String[] args) {
String str = null;
System.out.println(str.length());
}
}

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int x = 6;
if (x > 5) {
System.out.println("Hello");
} else {
System.out.println("World");
}
}
}

What is the output of the following code?

public class Main {
public static void main(String[] args) {
int i = 10;
do {
System.out.print(i + " ");
i--;
} while (i > 0);
}
}