Java Type Casting and Conversion
Understand Java type casting: implicit vs explicit casting, widening vs narrowing conversions, and the rules Java follows for numeric type compatibility.
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Type Erasure in Java Generics
Understand how Java generics disappear at compile time, what erasure does to your types, and the implications for your code.
java.util.function Package
Master java.util.function: Predicate, Function, Supplier, Consumer, and their binary/triple variants for functional-style Java.
java.util.Objects
Explore java.util.Objects: null-safe utilities like requireNonNull, deepEquals, toString, hash, and compare for defensive Java code.
java.util.Optional
Learn java.util.Optional: the null wrapper that makes absence explicit. Master map, flatMap, filter, orElse, and common anti-patterns.
Variable Scope
Local, instance, and class-level variable scope in Java — where variables live, how long they persist, and what can access them.
Java Variables and Constants
Master Java variable declaration with var, final, and static final. Learn about scope, initialization, and when to use each modifier.
While and Do-While Loops in Java
Learn Java while and do-while loops: pre-test vs post-test iteration, infinite loops, loop termination strategies, and when to choose each loop type.
Wildcards in Java Generics
Use ?, ? extends T, and ? super T to master covariance and contravariance in Java method parameters.
Java Wrapper Classes
Master Java wrapper classes: Integer, Double, Boolean and more — immutable wrappers that add utility methods and null support to primitives.