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#JAVA COLLECTIONS QUESTIONS CODE#

Explain some of the popular key interfaces available in the collection framework and explain their utility of using them.

There are many interfaces already defined in the case of the collection framework design of the existing java application. If by mistake developers have done the same, then it will throw ClasCastExpection at compilation time. If the developer mentioned one collection interface object type, it would never accept any other reference. But in the case of compilation, it will never be identified. Initially, the same exception came at runtime without any previous definition. It introduced some of the approaches which actually provided ClassCastException at compilation time. Java 1.5 came with some critical functionalities specifically in the collection framework, which enhances some of the generic interface’s legacy features. Explain the benefits of using the collection framework generic version from starting collection interfaces and classes on the Java 4 version onwards.

#JAVA COLLECTIONS QUESTIONS CODE#

Improve code reusability and maintained proper interoperability.

Efforts on code maintenance have always been reduced.

Code quality is always enhanced, including performance.

Reduced development efforts by implementing defined collection classes.

The benefits of collection framework are defined below: Java Collection has worked with these approaches for long days and came with many concurrent collection classes to ensure thread safety on varieties operations. Implementation and defining the algorithm for those interfaces are really useful for any Java developer at any time of execution. The java upper version introduces many feature-oriented interfaces and comes with some key roles for any kind of java programming. Initially, it was only holding some of the legacy interfaces, like Vector, Hashtable, Stack, and Array, which are obsolete in terms of the longtime journey of java. The collection framework is kind of a much-highlighted package from the day java introduce this package. Provide more details on the exact benefits provided by the collection framework in the Java application. Explain in detail about the Java Collections framework used in Java applications. Methods are for Each Remaining, replace all, computer, merge specially introduce an Iterator interface.

Miscellaneous collection API: Many methods have been introduced in the case of Miscellaneous Collection of the framework.

Java 8 introduced one of Lambda expressions key features because of its arguments it will be very easy to use on the iterator interface.

Introducing the for each method specifically for iterator interface: This is one of the default methods when the developer is going to use an iterator for fetching data from any of the collection interfaces.

Stream API for Java: For supporting some of the sequential and parallel processing.

Java 8 version already came with some of the key or major changes in Java Collection Framework:

Explain what are the new features that came with the collection framework for Java 8 version?

The collection framework is always a highlighted package for Java, so every version of Java always came with some key features, specifically on the Collection framework. Java has introduced a different version in almost the last couple of years. This first part covers basic Java Collection Interview Questions and Answers. Since Student doesn't override equals(), there are 5 objects in the HashSet.Part 1 – Java Collection Interview Questions (Basic) What will be the result for below program? Poll() method removes the first element in queue and returns it, while peek() method returns the first element without removing it. PriorityQueue keeps elements sorted and it can have duplicates.Īdd() and offer() methods both offer same functionality. PriorityQueue pQueue = new PriorityQueue() What will be the output of following Java quiz on PriorityQueue ? What will be output of following program ?ĪrralyList can contain duplicate elements.ĪrrayList remove() method only removes the first occurrence of a matching element. So, when add() is called, an exception is thrown. Arrays.asList() returns a fixed-size list backed by the specified array.