Collections Framework Archives - Page 2 of 3

Generic Declarations in Java

December 20, 2018 gyanauce2006 Collections Framework, Core Java, Java

Let us see the declaration of java.util.List interface. In the above declaration, “E” is a placeholder for the type[…]

Polymorphism and Generics continues…

November 11, 2018 gyanauce2006 Collections Framework, Core Java, Java

The compiler only allows the List of Type Animal to the method add. Otherwise , it throws compilation error. Is[…]

Polymorphism and Generics in Java

November 11, 2018 gyanauce2006 Collections Framework, Core Java, Java

Let us create the below Hierarchy of Classes. class Animal {} class Dog extends Animal{} class Cat extends Animal{} Here,[…]

Generics: Type Erasure in Java

November 4, 2018 gyanauce2006 Collections Framework, Core Java, Java

Before we dwell into the concept of “Type Erasure”, let us have a look into the below code. Mixing Generic[…]

Java Generics: Type-Safe and Flexible Programming

November 3, 2018 gyanauce2006 Collections Framework, Core Java, Java

What are Java Generics? Generics in Java provide a way to create classes, interfaces, and methods that can work with[…]

equals and hashCode in Java

March 31, 2017 gyanauce2006 Collections Framework, Core Java, Core Java Basics, Java

equals method is used to check the equality of two objects based on it’s contents. equals versus == If two[…]

LinkedHashMap in Java

March 21, 2017 gyanauce2006 Collections Framework, Core Java, Java

LinkedHashMap implements Map and extends HashMap.Please visit HashMap for understanding the internal working of HashMap before you read further so that it becomes[…]

TreeMap in Java

March 18, 2017 gyanauce2006 Collections Framework, Core Java, Java

Before we jump into TreeMap, let us first look into Tree Data Structure. The basic building block for the tree[…]

Comparable vs Comparator

March 17, 2017 gyanauce2006 Collections Framework, Core Java, Java

Comparable Comparator What is it? Here the Object compares itself with another Object of same type.For example: An Employee comparing[…]

CopyOnWriteArrayList vs SynchronizedList

March 13, 2017 gyanauce2006 Collections Framework, Core Java, Java

CopyOnWriteArrayList(Introduced in JDK 1.5) SynchronizedList Creation List list = new CopyOnWriteArrayList(); List list = new ArrayList(); List syncList = Collections.synchronizedList(list);[…]