✅TOP 100 CORE JAVA PRACTICE QUESTIONS

Here are top 100 core java practical questions mostly asked in interview.

Conditional Statements

Write a program to check if a number is positive, negative, or zero.
Write a program to find the largest of three numbers.
Write a program to check if a number is even or odd.
Write a program to check if a character is a vowel or consonant.
Write a program to check if a year is a leap year or not.
Write a program to check if a number is prime.
Write a program to find the greatest of three numbers using the ternary operator.
Write a program to check if a number is a palindrome.
Write a program to check if a string is a palindrome.
Write a program to print the day of the week based on a number (1-7).

Patterns

Write a program to print a pyramid pattern.
Write a program to print a reverse pyramid pattern.
Write a program to print a right-angled triangle pattern.
Write a program to print an inverted right-angled triangle pattern.
Write a program to print a diamond pattern.
Write a program to print a hollow square pattern.
Write a program to print a hollow triangle pattern.
Write a program to print a Pascal's triangle.
Write a program to print a Floyd's triangle.
Write a program to print a butterfly pattern.

Series

Write a program to print the Fibonacci series up to a given number.
Write a program to print the factorial of a number.
Write a program to print the sum of the first n natural numbers.
Write a program to print the sum of the first n odd numbers.
Write a program to print the sum of the first n even numbers.
Write a program to print the prime numbers in a given range.
Write a program to print the sum of digits of a number.
Write a program to print the Armstrong numbers in a given range.
Write a program to print the perfect numbers in a given range.
Write a program to print the sum of the series 1 - 2 + 3 - 4 + ... + n.

Combination of Patterns/Series/OOP Concepts

Write a program to print a pyramid pattern of prime numbers.
Write a program to print a right-angled triangle pattern of Fibonacci numbers.
Write a program to print the factorial of each number in a given range using recursion.
Write a program to check if a given number is a palindrome using a method.
Write a program to print a diamond pattern using the sum of digits of numbers.
Write a program to print a pattern of Armstrong numbers.
Write a program to print a combination of Pascal's triangle and prime numbers.
Write a program to print the sum of the first n prime numbers using a method.
Write a program to print the sum of the series 1 - 2 + 3 - 4 + ... + n using a method.
Write a program to print the factorial of numbers in a pattern.

`this` Keyword

Write a program to demonstrate the use of the this keyword in constructors.
Write a program to demonstrate the use of the this keyword to refer to instance variables.
Write a program to demonstrate the use of the this keyword to invoke current class methods.
Write a program to demonstrate the use of the this keyword to return the current class instance.
Write a program to demonstrate the use of the this keyword in method chaining.
Write a program to demonstrate the use of the this keyword to invoke a constructor.
Write a program to demonstrate the use of the this keyword to pass an argument in the constructor call.
Write a program to demonstrate the use of the this keyword to resolve shadowing problem.
Write a program to demonstrate the use of the this keyword in setter methods.
Write a program to demonstrate the use of the this keyword to access class members.

`super` Keyword

Write a program to demonstrate the use of the super keyword to access superclass variables.
Write a program to demonstrate the use of the super keyword to invoke superclass methods.
Write a program to demonstrate the use of the super keyword to invoke superclass constructors.
Write a program to demonstrate the use of the super keyword to access superclass methods in a method overriding scenario.
Write a program to demonstrate the use of the super keyword in constructor chaining.
Write a program to demonstrate the use of the super keyword to call superclass static methods.
Write a program to demonstrate the use of the super keyword in an inheritance hierarchy with multiple levels.
Write a program to demonstrate the use of the super keyword to access superclass fields when they are shadowed by subclass fields.
Write a program to demonstrate the use of the super keyword in the context of a superclass reference.
Write a program to demonstrate the use of the super keyword in method overriding with return types.

`final` Keyword

Write a program to demonstrate the use of the final keyword with variables.
Write a program to demonstrate the use of the final keyword with methods.
Write a program to demonstrate the use of the final keyword with classes.
Write a program to demonstrate the use of the final keyword to create immutable objects.
Write a program to demonstrate the use of the final keyword in method parameters.
Write a program to demonstrate the use of the final keyword with static variables.
Write a program to demonstrate the use of the final keyword with instance variables.
Write a program to demonstrate the use of the final keyword in nested classes.
Write a program to demonstrate the use of the final keyword in anonymous classes.
Write a program to demonstrate the use of the final keyword with local variables in a method.

Methods

Write a program to demonstrate method overloading.
Write a program to demonstrate method overriding.
Write a program to demonstrate the use of static methods.
Write a program to demonstrate the use of instance methods.
Write a program to demonstrate the use of recursive methods.
Write a program to demonstrate the use of the main method.
Write a program to demonstrate the use of the valueOf method in the String class.
Write a program to demonstrate the use of the compareTo method in the String class.
Write a program to demonstrate the use of the substring method in the String class.
Write a program to demonstrate the use of the length method in the String class.

Miscellaneous

Write a program to demonstrate the use of the Math class methods.
Write a program to demonstrate the use of the Arrays class methods.
Write a program to demonstrate the use of the StringBuilder class methods.
Write a program to demonstrate the use of the StringBuffer class methods.
Write a program to demonstrate the use of the Scanner class methods.
Write a program to demonstrate the use of the Random class methods.
Write a program to demonstrate the use of the System class methods.
Write a program to demonstrate the use of the Locale class methods.
Write a program to demonstrate the use of the Date class methods.
Write a program to demonstrate the use of the Calendar class methods.

Advanced

Write a program to demonstrate the use of nested loops.
Write a program to demonstrate the use of the switch statement.
Write a program to demonstrate the use of labeled break and continue.
Write a program to demonstrate the use of exception handling using try, catch, finally.
Write a program to demonstrate the use of custom exceptions.
Write a program to demonstrate the use of assert statement.
Write a program to demonstrate file reading and writing using FileReader and FileWriter.
Write a program to demonstrate file reading and writing using BufferedReader and BufferedWriter.
Write a program to demonstrate reading and writing binary data using FileInputStream and FileOutputStream.
Write a program to demonstrate reading and writing objects using ObjectInputStream and ObjectOutputStream.

These questions cover a wide range of core Java concepts and provide practical exposure to various topics.

✅TOP 100 CORE JAVA PRACTICE QUESTIONS

Here are top 100 core java practical questions mostly asked in interview.

Conditional Statements

Patterns

Series

Combination of Patterns/Series/OOP Concepts

this Keyword

super Keyword

final Keyword

Methods

Miscellaneous

Advanced

`this` Keyword

`super` Keyword

`final` Keyword