Java Programming for Absolute Beginners

Learn how to swap two integers in Java using a temp variable. This solution demonstrates assigning temp, swapping the first value, and restoring the second value to complete the swap.

learn to implement a rectangle in Java by using length and width to compute the area and the perimeter, with hints and a follow-up solution video.

Learn how comparison operators produce boolean results, using equals and not equals, and compare numbers and characters with greater than, less than, and their inclusive forms.

Explore strings in Java by declaring variables in double quotes, including numbers as characters, and practice concatenation with plus and plus equals to extend strings, with int-to-string conversion when printing.

Compare while and for loops, using pseudocode and linked-list examples to show when to loop until a condition fails or when the iteration count is known.

Learn how to iterate over collections with for-each loops in Java, converting strings to char arrays, using length and charAt, and contrasting with traditional for loops over arrays.

Learn how wrapper classes convert primitives to objects, enabling boxing and auto boxing, and unboxing, and why array lists store only wrapper types while arrays can hold primitives.

Explore array lists, which resemble arrays but have dynamic length, and declare ArrayList<Integer> using the Integer wrapper instead of int, with diamond notation.

Explore Java ArrayList methods, including add, insert with index, remove, get, set, size, clear, isEmpty, contains, and indexOf, with examples using a for loop and unboxing.

Explore maps, key value pairs, and duplicate key rules across hash maps, tree maps, and linked hash maps, then learn common operations like get, contains key, size, remove, and clear.