How to work with this repository

• Clone the repository from here https://github.com/sangaryousmane/java-interview-questions.git
• Navigate into the /src directory if you need the answers to all the questions but make sure to try the questions on your own first
• The /src directory has subdirectories based on your need. For instance, there is a subdirectory for Basics, Arrays, Search Algorithms et al.
• Make sure and practice more, don't copy and paste but type the codes instead.

Part I: Introduction to Java programming

Check all the manual of this part in this link: Here

Questions:

1. Input a year and find whether it is a leap year or not.
2. Take two numbers and print the sum of both.
3. Take a number as input and print the multiplication table for it.
4. Take 2 numbers as inputs and find their HCF and LCM.
5. Keep taking numbers as inputs till the user enters ‘x’, after that print sum of all.

PART II: Write Java programs for the following:

Check all the manual of this part in this link: Here

Questions:

1. Write a program to print whether a number is even or odd, also take input from the user.
2. Take name as input and print a greeting message for that particular name.
3. Write a program to input principal, time, and rate (P, T, R) from the user and find Simple Interest.
4. Take in two numbers and an operator (+, -, *, /) and calculate the value. (Use if conditions)
5. Take 2 numbers as input and print the largest number.
6. Input currency in rupees and output in USD.
7. To calculate Fibonacci Series up to n numbers.
8. To find out whether the given String is Palindrome or not.
9. To find Armstrong Number between two given number.

PART III: Basic Java Programs

Questions:

Check all the manual of this part in this link: Here

1. Area Of Circle Java Program
2. Area Of Triangle
3. Area Of Rectangle Program
4. Area Of Isosceles Triangle
5. Area Of Parallelogram
6. Area Of Rhombus
7. Area Of Equilateral Triangle
8. Perimeter Of Circle
9. Perimeter Of Equilateral Triangle
10. Perimeter Of Parallelogram
11. Perimeter Of Rectangle
12. Perimeter Of Square
13. Perimeter Of Rhombus
14. Volume Of Cone Java Program
15. Volume Of Prism
16. Volume Of Cylinder
17. Volume Of Sphere
18. Volume Of Pyramid
19. Curved Surface Area Of Cylinder
20. Total Surface Area Of Cube
21. Fibonacci Series In Java Programs
22. Subtract the Product and Sum of Digits of an Integer
23. Input a number and print all the factors of that number (use loops).
24. Take integer inputs till the user enters 0 and print the sum of all numbers (HINT: while loop)
25. Take integer inputs till the user enters 0 and print the largest number from all.
26. Addition Of Two Numbers

Intermediate Java Programs

28. Factorial Program In Java
29. Calculate Electricity Bill
30. Calculate Average Of N Numbers
31. Calculate Discount Of Product
32. Calculate Distance Between Two Points
33. Calculate Commission Percentage
34. Power In Java
35. Calculate Depreciation of Value
36. Calculate Batting Average
37. Calculate CGPA Java Program
38. Compound Interest Java Program
39. Calculate Average Marks
40. Sum Of N Numbers
41. Armstrong Number In Java
42. Find Ncr & Npr
43. Reverse A String In Java
44. Find if a number is palindrome or not
45. Future Investment Value
46. HCF Of Two Numbers Program
47. LCM Of Two Numbers
48. Java Program Vowel Or Consonant
49. Perfect Number In Java
50. Check Leap Year Or Not
51. Sum Of A Digits Of Number
52. Kunal is allowed to go out with his friends only on the even days of a given month. Write a program to count the number of days he can go out in the month of August.
53. Write a program to print the sum of negative numbers, sum of positive even numbers and the sum of positive odd numbers from a list of numbers (N) entered by the user. The list terminates when the user enters a zero.

Functions in Java

Questions

1. Define two methods to print the maximum and the minimum number respectively among three numbers entered by the user.
2. Define a program to find out whether a given number is even or odd.
3. A person is eligible to vote if his/her age is greater than or equal to 18. Define a method to find out if he/she is eligible to vote.
4. Write a program to print the sum of two numbers entered by user by defining your own method.
5. Define a method that returns the product of two numbers entered by user.
6. Write a program to print the circumference and area of a circle of radius entered by user by defining your own method.
7. Define a method to find out if a number is prime or not.
8. Write a program that will ask the user to enter his/her marks (out of 100). Define a method that will display grades according to the marks entered as below:

Marks Grade 91-100 AA 81-90 AB 71-80 BB 61-70 BC 51-60 CD 41-50 DD <=40 Fail 10. Write a program to print the factorial of a number by defining a method named 'Factorial'. Factorial of any number n is represented by n! and is equal to 1 * 2 * 3 * .... * (n-1) *n. E.g.-

4! = 1 * 2 * 3 * 4 = 24 3! = 3 * 2 * 1 = 6 2! = 2 * 1 = 2 Also, 1! = 1 0! = 1 12. Write a function to find if a number is a palindrome or not. Take number as parameter. 13. Convert the programs in flow of program, first java, conditionals & loops assignments into functions. 14. Write a function to check if a given triplet is a Pythagorean triplet or not. (A Pythagorean triplet is when the sum of the square of two numbers is equal to the square of the third number). 15. Write a function that returns all prime numbers between two given numbers. 16. Write a function that returns the sum of first n natural numbers.

Arrays In Java

Submit the following on your Leetcode profile itself.

Easy

1. Build Array from Permutation
2. Concatenation of Array
3. Running Sum of 1d Array
4. Richest Customer Wealth
5. Shuffle the Array
6. Kids With the Greatest Number of Candies
7. Number of Good Pairs
8. How Many Numbers Are Smaller Than the Current Number
9. Create Target Array in the Given Order
10. Check if the Sentence Is Pangram
11. Count Items Matching a Rule
12. Find the Highest Altitude
13. Flipping an Image
14. Cells with Odd Values in a Matrix
15. Matrix Diagonal Sum
16. Find Numbers with Even Number of Digits
17. Transpose Matrix
18. Add to Array-Form of Integer
19. Maximum Population Year
20. Determine Whether Matrix Can Be Obtained By Rotation
21. Two Sum
22. Find N Unique Integers Sum up to Zero
23. Lucky Number In a Matrix
24. Maximum Subarray
25. Reshape the Matrix
26. Plus One
27. Remove Duplicates from Sorted Array
28. Minimum Cost to Move Chips to The Same Position

Medium

1. Spiral Matrix
2. Spiral Matrix II
3. Spiral Matrix III
4. Set Matrix Zeroes
5. Product of Array Except Self
6. Find First and Last Position of Element in Sorted Array
7. Jump Game
8. Rotate Array
9. Sort Colors
10. House Robber
11. Hard
12. Max Value of Equation
13. First Missing Positive
14. Good Array