![]() Followed by the Java Collections Framework, you must learn and understand the Hierarchy of Java collections and various descendants or classes and interfaces involved in the Java Collections.Īlso Read: What is Java: A Beginners Guide To Java Java Collection Framework Hierarchy Java Collection Framework enables the user to perform various data manipulation operations like storing data, searching, sorting, insertion, deletion, and updating of data on the group of elements. Java Collection Framework offers the capability to Java Collection to represent a group of elements in classes and Interfaces. The Best Guide to Know What Is Vue JS Lesson - 34 What Is Junit? a Look Into the Best Java Testing Framework Lesson - 32 Java Programming: The Complete Reference You Need Lesson - 30Īll You Need to Know to Implement JUnit Testing in Java Lesson - 31 Top 25+ Brilliant Java Project Ideas You Need to Know Lesson - 28ġ80+ Core Java Interview Questions and Answers for 2023 Lesson - 29 Introduction To Java Servlets and Its Life-Cycle Lesson - 26ġ0 Best Java Frameworks You Should Know in 2021 Lesson - 27 What is Java API and The Need for Java APIs? Lesson - 25 What Is Java JDBC? The Complete Reference Lesson - 24 What is Exception Handling in Java? Lesson - 23 Java EE Tutorial: All You Need To Know About Java EE Lesson - 22 ![]() Top 25 Pattern Programs in Java For Printing Numbers Lesson - 21 Java vs JavaScript: Know The 8 Major Differences Lesson - 20 Python: Which is the Best Programming Language? Lesson - 19 The Differences Between C++ and Java That You Need To Know Lesson - 18 Your One-Stop Solution for Multithreading in Java Lesson - 17 What is a Java Lambda Expression and How to Implement It? Lesson - 16 What is Polymorphism in Java and How to Implement It? Lesson - 15 What is Java Interface and Why it's Needed? Lesson - 14 What is Inheritance in Java and How to Implement It Lesson - 13 ![]() What is an Abstract Class in Java and How to Implement It? Lesson - 12 What is Encapsulation in Java and How to Implement It? Lesson - 11 ![]() How to Implement the Revolutionary OOPs Concepts in Java Lesson - 10 What Are Java Classes and Objects and How Do You Implement Them? Lesson - 9 What Are Java Collections and How to Implement Them? Lesson - 8 What Are Java Strings And How to Implement Them? Lesson - 6Īrrays In Java: Declare, Define, and Access Array Lesson - 7 How to Get Started With Eclipse IDE? Lesson - 5 One-Stop Solution for Java Installation in Windows Lesson - 4 What Is JDK in Java? Why Do We Need It? Lesson - 3 What is Java: A Beginners Guide To Java Lesson - 2 However there are probably some corner cases where this is necessary and the change would break all existing implementations that throw NPEs.10 Reasons That Explain Why You Need to Learn Java Lesson - 1 Such exceptions are marked as "optional" in the specification for this interface."Īs a sidenote: It would be cleanest to completely remove the option of throwing an NPE from the API. More generally, attempting an operation on an ineligible element whose completion would not result in the insertion of an ineligible element into the collection may throw an exception or it may succeed, at the option of the implementation. "Attempting to query the presence of an ineligible element may throw an exception, or it may simply return false some implementations will exhibit the former behavior and some will exhibit the latter. "NullPointerException - if the specified element is null and this list does not permit null elements (optional)" List#contains says the following about NPE: So even when looking at ListN it is unclear if it is allowed to call contains(null) or not.Īccording to the API Docs, I would say it doesn't: However this only makes it much more likely to generate bugs since programmers might not be aware of this behavior.Īlso ImmutableCollections.ListN already has the option to allow nulls. Right now this is probably not happening as often because there are not many ways to create these collections. Without this change, libraries would probably have to change many occurrences of contains/indexOf to make sure null is never passed in (or always put all values into an ArrayList before querying). I think the change would make ImmutableCollections more consistent with the user's expectations as well as other implementations of List. If now someone passes in an ImmutableCollections collection, it will crash. When querying these collections for null, the query crashes with a NullPointerException.Ĭhange the querying methods (contains, indexOf, lastIndexOf) in the different ImmutableCollections to return false when querying for null instead of NullPointerException.Ĭode accepting the List interface can break easily because other List implementations like ArrayList can be queried for null. Currently the collections in do not support null values. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |