Core java - Interview Questions and Answers for 'Huawei' - 3 question(s) found - Order By Newest Advanced level question usually asked in High end product companies. Have been asked in Google and Amazon (Based on 1 Feedback) Q1. Describe, in general, how java's garbage collector works ? Core Java
Ans. The Java runtime environment deletes objects when it determines that they are no longer being used. This process is known as garbage collection. The Java runtime environment supports a garbage collector that periodically frees the memory used by objects that are no longer needed. The Java garbage collector is a mark-sweep garbage collector that scans Java dynamic memory areas for objects, marking those that are referenced. After all possible paths to objects are investigated, those objects that are not marked (i.e. are not referenced) are known to be garbage and are collected. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve  java   garbage collection   java memory management   advanced Asked in 21 Companies intermediate   frequent Try 4 Question(s) TestRelated Questions Why Char array is preferred over String for storing password? Does garbage collection guarantee that a program will not run out of memory? Let's suppose we have an to destroy objects, Design a program to implement garbage collection ? Should we override finalize method ? What are strong, soft, weak and phantom references in Java ? Can we call the garbage collector explicitly ? What does String intern() method do? Which type of memory is cleaned / recovered by garbage collection - stack or heap ? Java doesn't provide exclusive access to memory like C/C++ and other lower level languages ? What are the advantanges and disadvantages ? Q2. what are different pointer operators used ? Core Java
This question was recently asked at 'Huawei Technologies'.This question is still unanswered. Can you please provide an answer. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve   Asked in 1 Companies Related Questions Difference between == and .equals() ? What are different ways of object creation in Java ? What is instanceOf operator ? Explain it's use ? What is the difference between the following two code lines ?
1. new OuterClass().new InnerClass();
2. new OuterClass.InnerClass(); According to Java Operator precedence, which operator is considered to be with highest precedence? Difference between new operator and Class.forName().newInstance() ? Does java supports operator overloading ? Difference between Class#getInstance() and new operator ? What is the difference between >> and >>>? Which Java operator is right associative? Q3. how hashmap work? Write a program that uses map interface ? Core Java
This question was recently asked at 'Huawei'.This question is still unanswered. Can you please provide an answer. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve   Asked in 1 Companies Related Questions Difference between HashMap and Hashtable? Difference between TreeMap and HashMap ? Can you provide some implementation of a Dictionary having large number of words ? How is Hashmap internally implemented in Java ? What is a ConcurrentHashMap ? Why HashTable has been deprecated ? Can we use null as a key for a map collection ? Which of the following collections stores its elements in insertion Order ?
a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap Difference between Map and HashMap ? Can we add duplicate keys in a HashMap ? What will happen if we attempt to add duplicate values ?