110 Java Multithreading Interview Questions and Answers (Part 2)

31. What is a Scheduler? A scheduler is a program that is the implementation of a scheduling algorithm to manage access of processes and threads to limited resource like CPU or an I/O channel. The goal of most scheduling algorithms is to provide load balancing for the available processes/threads and to guarantee that each process/thread … Read more110 Java Multithreading Interview Questions and Answers (Part 2)

110 Java Multithreading Interview Questions and Answers (Part 1)

In this post, we have included all the top Java Multi-threading Interview Questions and Answers that are frequently asked in an Interview with detailed answers to it. Every interview is different and the scope of a job is different too. Let us go through a few important Java Multi-threading Interview Questions which may be asked … Read more110 Java Multithreading Interview Questions and Answers (Part 1)

100 Java Collection Interview Questions and Answers (Part 3)

57.How remove() method is get() method. First we locate the correct bucket in HashMap for an entry. Then within that bucket we remove the element e. It is similar to removing a node from a single-linked list. implemented in a HashMap? Remove() method in HashMap uses logic similar to the one used in If e … Read more100 Java Collection Interview Questions and Answers (Part 3)

100 Java Collection Interview Questions and Answers (Part 2)

Java Collection Interview Questions and Answers part 2 walks you through Java collection framework. It provides an architecture to store and manipulate a group of objects. A Java collection framework includes the following: Interfaces, Classes, Algorithm. 27.How will you copy elements from a Source List to another list? There are two options to copy a … Read more100 Java Collection Interview Questions and Answers (Part 2)

Java 8 NullPointerException in Collectors.toMap

The Java 8 Collectors.toMap throws a NullPointerException if one of the values is ‘null’. This error make developers confused and don’t know why this behavior happens, although maps can contain null pointers as value without any problems. Is there a good reason why values cannot be null for Collectors.toMap? Let’s check the example to see … Read moreJava 8 NullPointerException in Collectors.toMap

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