Java Interview Questions and Answers for 3 to 10 years of Experienced Developers|Part-1|Code Decode скачать в хорошем качестве

Java Interview Questions and Answers for 3 to 10 years of Experienced Developers|Part-1|Code Decode

In this video of Code Decode we have explained most commonly asked java interview questions and Answers for Experienced candidates of 3 to 5 years. Udemy Course of Code Decode on Microservice k8s AWS CICD link: https://openinapp.co/udemycourse Course Description Video : https://yt.openinapp.co/dmjvd This question is very important with respect to Java Interview Questions and Answers for experienced developer How substring works in Java or sometimes asked as to how does substring creates memory leak in Java. This is very important question asked in Java interviews for experienced candidates. We all know that String in Java is sequence of characters. String is internally represented by array of characters, when new String object is created, it has following fields. char value[] – Array of characters int count – Total characters in the String int offset – Starting index offset in character array When we take substring from original string, new String object will be created in constant pool or in heap. The value[] array will be shared among two String objects, Till java 6 : String bigString = new String(new byte[100000]) The above String already occupies a lot of memory in heap. Now consider the scenario where we need first 2 characters from bigString,. String substr = bigString.substring(0, 2) Now we don’t need the original String. bigString = null We might think that bigString object will be Garbage collected as we made it null but our assumption is wrong. When we call substring(), a new String object is created in memory. But still it refers the char[] array value from original String. This prevents bigString from Garbage collection process and we are unnecessarily storing 100000 bytes in memory (just for 2 characters). What is the load factor in HashMap? HashMap's performance depends on two things first initial capacity and second load factor whenever we create HashMap initial capacity number of the bucket is created initially and load factor is the criteria to decide when we have to increase the size of HashMap when it's about to get full. A load factor is a number that controls the resizing of HashMap when a number of elements in the HashMap cross the load factor as if the load factor is 0.75 and when becoming more than 75% full then resizing trigger which involves array copy. How does resize happens in HashMap The resizing happens when the map becomes full or when the size of the map crosses the load factor. For example, if the load factor is 0.75 and then becomes more than 75% full, then resizing trigger, which involves an array copy. First, the size of the bucket is doubled, and then old entries are copied into a new bucket. What is the difference between the capacity and size of HashMap in Java? The capacity denotes how many entries HashMap can store, and size denotes how many mappings or key/value pair is currently present. Most Asked Core Java Interview Questions and Answers :    • Core Java frequently asked Interview Quest...   Advance Java Interview Questions and Answers :    • Advance Java Interview Questions   Java 8 Interview Questions and Answers :    • Java 8 Interview Questions(New Features)   Hibernate Interview Questions and Answers :    • Hibernate Interview Questions Java   Spring Boot Interview Questions and Answers :    • Advance Java Interview Questions   Angular Playlist :    • Angular Course Introduction || Angular 8   SQL Playlist :    • SQL Interview Questions and Answers   GIT :    • GIT   Subscriber and Follow Code Decode Subscriber Code Decode : https://www.youtube.com/c/CodeDecode?... LinkedIn :   / codedecodeyoutube   Instagram :   / codedecode25   #codedecode #javaInterviewQuestions #JavaInterviewExperienced