Tag: Java Collection

Properties

Properties It is the child class of Hashtable. In this case both key and value should be String Object only. Constructor Properties p = new Properties () Important methods of Properties String getProperty (String name). Return the value associated with the specified Property. If the specified property is not available then we will get null. […]

One of the IT Companies Java Interview Questions and Answers-1

One of the IT Companies Java Interview Questions and Answers-1   1)  How many objects will be created for the following scenario? Integer a1=10; Integer a1=10; Integer a1=20; Integer a1=15; Ans: 3 objects will be created. Explanation: Java storing value in the cache and while initialization will check in the cache, if it is exist […]

What is difference between Vector and ArrayList in Java?

Classes and Objects interview questions

Here is list of my favorite, frequently asked Questions from Java collection framework. Almost all of these questions have appeared in Java interview at various level ranging from Junior to Senior software engineer level. ArrayList and Vector are two of most used class on java collection package What is difference between Vector and ArrayList in Java? […]

What is difference between List, Set and Map

Classes and Objects interview questions

1. What is difference between List, Set and Map? List List is an ordered collection. List allows duplicate elements. List allows null elements and also store many null elements because it allows duplicate elements. The following most useful classes implementing List interface 1. ArrayList  2. LinkedList  3. Vector Set Set is unordered collection. Set does not […]