Search Interview Questions |  More than 3000 questions in repository. There are more than 900 unanswered questions. Click here and help us by providing the answer. Have a video suggestion. Click Correct / Improve and please let us know. |
|
|||
|
| ||||
| Core java - Interview Questions and Answers for 'Cumulus systems' - 5 question(s) found - Order By Newest | ||||
 Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems | ||||
| ||||
| Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory. x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object. Sample code: String x = new String("str"); String y = new String("str"); System.out.println(x == y); // prints false System.out.println(x.equals(y)); // prints true | ||||
 Sample Code for equals | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
 Discuss Correct / Improve  java string comparison string object class == equals object equality operator == vs equals equals vs ==  Asked in 294 Companies  basic  frequent | ||||
 Try 6 Question(s) Test | ||||
| Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. | ||||
| ||||
| Ans. They are different the way their elements are stored in memory. TreeMap stores the Keys in order whereas HashMap stores the key value pairs randomly. | ||||
| Sample Code for treemap Sample Code for hashmap | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java collections map treemap hashmap treemap vs hashmap Asked in 31 Companies basic frequent | ||||
| Try 1 Question(s) Test | ||||
| Frequently asked to fresh graduates and less experienced developers. | ||||
| ||||
| Ans. 1. Multithreading provides better interaction with the user by distribution of task 2. Threads in Java appear to run concurrently, so it provides simulation for simultaneous activities.The processor runs each thread for a short time and switches among the threads to simulate sim-ultaneous execution (context-switching) and it make appears that each thread has its own processor.By using this feature, users can make it appear as if multiple tasks are occurring simultaneously when, in fact, each is running for only a brief time before the context is switched to the next thread. 3. We can do other things while waiting for slow I/O operations.In the java.iopackage, the class InputStreamhas a method, read(), that blocks until a byte is read from the stream or until an IOExceptionis thrown. The thread that executes this method cannot do anything elsewhile awaiting the arrival of another byte on the stream. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java threads multi threading concurrency multithreading Asked in 5 Companies intermediate frequent | ||||
| Try 1 Question(s) Test | ||||
| Frequently asked in Indian Service Companies. Tech Mahindra ( Based on 3 inputs ) and Infosys ( 3 inputs ) | ||||
| ||||
| Ans. List - Members are stored in sequence in memory and can be accessed through index. Set - There is no relevance of sequence and index. Sets doesn't contain duplicates whereas multiset can have duplicates. Map - Contains Key , Value pairs. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java collections list set map list vs set vs map Asked in 8 Companies basic frequent | ||||
| Try 1 Question(s) Test | ||||
| ||||
| Ans. JVM (Java Virtual Machine) is an abstract machine. It is a specification that provides runtime environment in which java bytecode can be executed.JVMs are available for many hardware and software platforms (i.e. JVM is platform dependent).Runtime Instance Whenever you write java command on the command prompt to run the java class, an instance of JVM is createdThe JVM performs following operation:Loads codeVerifies codeExecutes codeProvides runtime environment | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve memory management jvm Asked in 3 Companies basic frequent | ||||
Which of the following statement is not true ?
