[Hackerrank] Java Interview Preparation: Solve Challenges

Solve the first HackerRank java problem by printing two lines: Hello world and Java, using the given main method and System.out.println, with no input and the expected output shown.

Learn to read three integers from standard input using the scanner class and print each on a new line, with notes on a buffer reader alternative.

Master Java if-else logic to classify a positive integer as odd or even and print the appropriate label for ranges 2–5, 6–20, and above 20 using modulus.

Read an integer, a double, and a string from standard input using the scanner, then print them in the prescribed format. Learn to handle input order and basic pitfalls.

Master Java output formatting by printing lines as two columns: a 15-character string field and a three-digit integer with leading zeros, processed with a loop.

Use a for loop to print ten lines of n into i is equal to result, with i ranging from 1 to 10.

Learn to handle multiple queries in Java loops II by building a series with a constant a, doubling b each iteration, for n terms, and printing space-separated results.

The lecture explains how to determine which Java primitive data types—byte, short, int, and long—can store a given input, using range checks and a try-catch approach across multiple test cases.

Read unknown lines from standard input until end-of-file in Java using Scanner.hasNext and Scanner.next, printing each line with a line number.