basic java programming questions for beginners

How to learn Java programming?
The best way to learn Java programming is by practicing examples. The page contains examples on basic concepts of Java. You are advised to take the references from these examples and try them on your own. All the programs on this page are tested and should work on all platforms. Want to learn Java by writing code yourself?
How do I prepare for a Java-based coding test?
If you’re pursuing a career where knowledge of Java is expected, then you’ll be asked to complete a Java-based coding test, as well as other questions related to Java. And, the best way to prepare for that test is to practice code challenges like these.
How many Java programming interview questions are there?
This collection of 50 Java programming interview questions included questions from beginner to expert level, to help you prepare for your interview. Thanks for learning with the DigitalOcean Community. Check out our offerings for compute, storage, networking, and managed databases. Still looking for an answer? Was this helpful?
How do I start a Java program?
You’ll even get AI-driven recommendations on what you need to review to help keep you on track. Write your first Java program from scratch by introducing yourself to users and planting a tree for them. You'll practice creating a class, defining the main method, and organizing print statements.

Word Reversal

For this challenge, the input is a string of words, and the output should be the words in reverse but with the letters in the original order. For example, the string “Dog bites man” should output as “man bites Dog.” After you’ve solved this challenge, try adding sentence capitalization and punctuation to your code. So, the string “Codecademy is the

Find The Word

Starting with an input string of words, find the second-to-last word of the string. For example, an input of “I love Codecademy” should return “love.” To make your program more challenging, allow for a second numerical input, n, that results in returning the nth word of a string. So, for the string “I can program in Java” and n= 3, the output shoul

Word Search

For a given input string, return a BooleanTRUE if the string starts with a given input word. So, for an input string of “hello world” and input word “hello,” the program should return TRUE. For a more advanced word searcher, create a program that returns the number of times a word appears in an input string. For example, given an input word “new” a

Anagrams

Two words are anagrams if they contain the same letters but in a different order. Here are a few examples of anagram pairs: 1. “listen” and “silent” 2. “binary” and “brainy” 3. “Paris” and “pairs” For a given input of two strings, return a Boolean TRUE if the two strings are anagrams. As an added challenge, for a given array of strings, return sepa

Pangrams

A pangram is a sentence that contains all 26 letters of the English alphabet. One of the most well-known examples of a pangram is, “The quick brown fox jumps over the lazy dog.” Create a pangram checker that returns a Boolean TRUE if an input string is a pangram and FALSE if it isn’t. For an added pangram challenge, create a perfect pangram checker

Number Reversal

This one is a technical interviewfavorite. For a given input number, return the number in reverse. So, an input of 3956 should return 6593. If you’re ready for a bigger challenge, reverse a decimal number. The decimal point should stay in the same place. So, the number 193.56 should output 653.91. codecademy.com

Armstrong Numbers

An Armstrong number is a whole number that’s equal to the sum of its digits raised to the power of the total number of digits. For example, 153 is an Armstrong number because there are three digits, and 153 = 13 + 53 + 33. The four-digit number 8208 is also an Armstrong number, as 8208 = 84 + 24 + 04 + 84. Create an Armstrong number checker that re

Product Maximizer

For a given input arrayof numbers, find the two that result in the largest product. The output should include the two numbers in the array along with their product. As an extra challenge, use an input of two arrays of numbers and find two numbers — one from each input array — that results in the largest product. codecademy.com

Prime Number Checker

A prime number is any whole number greater than 1 whose only factors are 1 and itself. For example, 7 is a prime number because it’s only divisible by 1 and 7. Create a function that returns TRUE if an input number is prime. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, and 19. For a slightly harder challenge, create a prime number calcul

Prime Factorization

The prime factors of a number are all of the integers below that number that are divisible into the number as well as 1. For example, the prime factors of 12 are 1,2,3,4,6, and 12. Create a prime factorization calculator that returns the prime factors of any number between 2 and 100. If you’re looking for a more advanced version of this challenge,

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