The Collection API is a set of classes and interfaces that support operation on collections of objects. These classes and interfaces are more flexible, more powerful, and more regular than the vectors, arrays,
On the other hand, a problem is deemed to have an optimal substructure if the optimal solution to the given problem can be constructed from optimal solutions of its subproblems. Programming technical interview questions 21. Explain how hash tables work Hashmaps, also known as hashtables, represe...
Now learn about designing a good key forHashMap. This question is an excellent way to test if you correctly understood HashMap’s internal working. This will help you in answering questions like – WhyStringis a good key for HashMap? How you will design a class to be used as key? Will...
Another good question that is usually followed up after answering how hashmap works. The most important constraint in a Map is thatwe must be able to fetch the ‘Value‘ object back in the future using the ‘Key‘ object. Otherwise, there is no use of having such a data structure. If ...
experience has seen this question on core Java or J2EE interview. Well there are many difference between them but most important isthread-safety,HashMapis not thread-safe whileHashtableis thread-safe collection. SeeHashtable vs HashMap in Javafor more differences between HashMap and Hashtable in...
Bitmap对象不再使用时调用recycle()释放内存 4. 无用时没有释放对象的引用 5. 在Activity中使用非静态的内部类,并开启一个长时间运行的线程,因为内部类持有Activity的引用,会导致Activity本来可以被gc时却长期得不到回收 6.使用Handler处理消息前,Activity通过例如finish()退出,导致内存泄漏 7.动态注册...
1.int hash 2.K key 3.V value 4.Node next It can be seen that node is containing a reference of its own object. So it’s a linked list. HashMap: array Node: node_hash_map Performance of HashMap depends on 2 parameters: 1.Initial Capacity 2.Load Factor As already said, Capacity ...
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[Question #4 – The Bank – Multithreading]You are given a class which implements a Bank as a singleton:public class Bank { // Singleton implementation omitted for brevity's sake // map from account number to balance private Map<String, Integer> accounts = new HashMap<>(); public int ...
adjacency map Familiarize yourself with each representation and its pros & cons BFS and DFS - know their computational complexity, their trade offs, and how to implement them in real code When asked a question, look for a graph-based solution first, then move on if none MIT(videos): Breadth...