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This article demonstrates three practical techniques—using a HashSet, leveraging Java 8 Stream API, and applying Map's merge functionality—to combine two List collections while eliminating duplicate elements, complete with full Java code examples and output illustration.
This article demonstrates six different techniques for eliminating duplicate elements from a Java List, including HashSet, TreeSet, LinkedHashSet, iterator-based removal, Stream distinct, and manual contains checks, each with complete code examples and output illustrations.
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This article explains the internal workings of Java's HashSet, covering its overview, various constructors, the add and remove operations implemented via HashMap, traversal techniques, and how LinkedHashSet and TreeSet extend HashSet functionality, providing code examples and conceptual diagrams.
This article explains how Java's hashCode() and equals() methods interact, illustrates their behavior with and without hash‑based collections through multiple code examples, and outlines the essential principles developers must follow when overriding these methods to ensure correct functionality in hash tables.
This article explains the Java collection class diagram, distinguishes concrete classes, abstract classes, and interfaces, describes Iterator and ListIterator behavior, and provides detailed code demonstrations of HashSet, ArrayList, ListIterator, and WeakHashMap usage along with their outputs.