Complete Java Tutorial Step by Step - become a programmer

Learn the basics of a Java program by exploring a hello world example, writing classes and methods, and understanding main and static methods, and command line arguments.

Learn to declare variables in Java using primitive data types—byte, char, short, int, long, float, double, and boolean—initialize values, understand memory allocation, and print results to the console.

Learn how Java identifiers are named: avoid keywords, spaces, and leading digits, and forbid special characters. Follow camelCase for variables and methods, and PascalCase for classes.

Learn the string type in Java as an explicit class, create string objects, use length and the plus operator to print concatenated names.

Learn to format console output in Java using System.out.printf, with format specifiers for strings, integers, and doubles, including alignment, width, and zero padding.

Learn to read user input from the keyboard in Java with the scanner class. Import the class, construct it with new Scanner(System.in), and read text and numbers.

Learn how the java.lang package is imported by default, why string and system classes don’t need imports, and how to access the scanner class using imports or fully qualified names.

Explore the Java math class in java.lang, use static methods such as abs, pow, floor, sqrt, max, and min, and apply overloading and constants e and pi.

Explore how the unary increment (++) and decrement (--) operators modify variables, including prefix and postfix usage and their behavior inside expressions with step-by-step examples.

Explore shortcut assignment operators in Java, including plus equals, times equals, and minus equals, to update a variable efficiently by applying operations like x += 10 or x *= 6.

Learn how to read a Celsius temperature in Java using a Scanner, convert it to Fahrenheit with the formula F = C * 9/5 + 32, and print the result.

Explore the logical and (&&) operator in Java, understand its truth table with boolean results, and learn to combine conditions to test teen age.

Master branching with if-else statements in Java, selecting code blocks based on conditions using relational and logical operators to find the maximum of two numbers.

Explore Java's conditional operator, the ternary operator with three operands, and how it replaces if-else statements. Learn syntax, usage for max of numbers, and nesting to handle three values.

Develop a Java program that calculates income tax using if-else ranges. Apply 0% up to 30,000, 5% from 30,000 to 50,000, and compute primary tax with surcharge for higher incomes.

Learn a Java leap year checker that uses the rule: year divisible by 4 and not by 100, or divisible by 400, with nested and simplified if-else logic.

Learn to compute the factorial of a number using a while loop, validate negative and zero inputs, and print the result with a step-by-step explanation.

Learn to input a number and print all its factors using a while loop by checking modulo. Count factors to identify primes and preview a future perfect-number check.

Extend Java tutorial to test if a given number is a perfect number by summing its factors and comparing sum to twice the number, with 6 and 28 as examples.

Understand the for loop syntax in Java by examining initialization, termination condition, and modifier, compare it with while loops, and see how the loop prints values.

Learn the for loop syntax, including initialization, modifiers, and termination conditions; see how to declare multiple variables, use comma separation, and move print statements into the modifiers section.

Master nested loops in Java by printing multiple patterns using i and j, including numbers and asterisks, with spacing and parity-based logic.

Understand the do-while loop in Java, its syntax and end-of-iteration condition, why it runs at least once, and a sum of user inputs example until the user enters zero.

learn how the break keyword terminates a loop early by exiting when a condition is met, such as i divisible by five.

Use the break keyword to exit the loop when a factor is found while testing if a number is prime. See Java with a boolean prime flag and square-root checks.

Learn how to break from nested loops using the break keyword, including breaking the inner loop and using a labeled outer loop when the sum is odd.

Use the continue keyword inside loops to skip the rest of an iteration and move to the next one. It works in for, while, and do-while loops.

Explore generating random numbers with the Random class from the java.util package, using nextDouble, nextInt (with and without bounds), and other methods such as nextBoolean, nextLong, and nextFloat.

Generate random numbers with thread local random, useful when multiple threads avoid contention. Use current and nextInt overloads to produce 10 inclusive to 100 exclusive bounds, and explore next methods.

Explore how to build a Java Armstrong number tester by counting digits, extracting each digit with modulo, summing digit powers with Math.pow, and comparing to the original.

Learn how method overloading lets you define multiple add methods with different signatures under one name. The compiler binds the best match at compile time, enabling compile-time polymorphism.

Initialize arrays with predefined constants using curly braces, creating a five-element int array and a three-element string array named names, then print them with a for loop.

Learn how to pass a 1 dimensional array to a method in Java, use references, modify array elements, and display results.

Learn how to traverse a one-dimensional array using the for-in loop, including syntax with a variable p, traversing any collection, deducing types with val, and printing each value.

Explore array operations by filling, displaying an integer array with random values, computing max, min, total, and average. Provide four methods to compute these values for a user-sized array.

Pass command line arguments to a Java program’s main method from any terminal and access them as a string array. Handle spaces with quotes; parse integers with Integer.parseInt.

Explore how Java's dynamic array-like collection, ArrayList, stores integers with generics, demonstrates index-based insertion, appending elements, retrieving size and elements with get, and iterative printing.

Learn how to pass a list of strings to a method in Java, print all names with a for in loop, and display total elements using the list size method.

Explore essential ArrayList methods such as clear, isEmpty, set, and remove, with practical examples on clearing, testing emptiness, replacing elements, removing by index or value, and printing the list size.