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 Q271. What is XSD ?Xml
Ans. XSD or Xml Schema Definition is an extension of DTD. XSD is more powerful and extensible than DTD

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   Like         Discuss         Correct / Improve     java   xml   markup language   xsd   dtd   architecture

 Q272. What is JAXP ?Xml
Ans. Stands for Java API for XML Processing. This provides a common interface for creating and using SAX, DOM, and XSLT APIs in Java regardless of which vendor’s implementation is actually being used.

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   Like         Discuss         Correct / Improve     java   java api   xml   xml processing   jaxp   abbreviation   technologies

 Q273. What is JAXB ?Xml
Ans. Stands for Java API for XML Binding. This standard defines a mechanism for writing out Java objects as XML and for creating Java objects from XML structures.

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   Like         Discuss         Correct / Improve     java   xml   markup language   java api for xml binding   jaxb   abbreviation   technologies     Asked in 2 Companies

Frequently asked in CTS ( Based on 2 feedback )
  Q274. What is the difference between comparable and comparator in java.util pkg?Core Java
Ans. Comparable interface is used for single sequence sorting i.e.sorting the objects based on single data member where as comparator interface is used to sort the object based on multiple data members.

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   Like         Discuss         Correct / Improve     java   java.util   comparable   comparator   collections     Asked in 23 Companies      basic        frequent

 Q275. What bean scopes does Spring support? Explain them.Spring
Ans. The Spring Framework supports following five scopes -

Singleton
prototype
request
session
global-session

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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications   beans   beans scope   at&t  fidelity

Very Frequently asked Spring question.
  Q276. What is bean auto wiring?Spring
Ans. The Spring container is able to autowire relationships between collaborating beans. This means that it is possible to automatically let Spring resolve collaborators (other beans) for your bean by inspecting the contents of the BeanFactory without using and elements.

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   Like         Discuss         Correct / Improve     j2ee   spring   mvc   frameworks   web applications   autowiring   beans   at&t   ge     Asked in 9 Companies        frequent

 Q277. Difference between socket and servlet ?Java EE
Ans. servlet is a small, server-resident program that typically runs automatically in response to user input.
A network socket is an endpoint of an inter-process communication flow across a computer network.

We can think of it as a difference between door and gate. They are similar as they both are entry points but they are different as they are put up at different areas.

Sockets are for low-level network communication whereas Servlets are for implementing websites and web services

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   Like         Discuss         Correct / Improve     java   j2ee   networking   servlet   socket   difference between.java.net   technologies   architecture

 Q278. What is PermGen or Permanent Generation ?Core Java
Ans. The memory pool containing all the reflective data of the java virtual machine itself, such as class and method objects. With Java VMs that use class data sharing, this generation is divided into read-only and read-write areas. The Permanent generation contains metadata required by the JVM to describe the classes and methods used in the application. The permanent generation is populated by the JVM at runtime based on classes in use by the application. In addition, Java SE library classes and methods may be stored here.

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   Like         Discuss         Correct / Improve     java   jvm   memory management   permgen   permanent generation   advanced   architecture     Asked in 9 Companies      expert

  Q279. Advantage of Collection classes over Arrays ?Core Java
Ans. Collections are re-sizable in nature. We can increase or decrease the size as per recruitment.
Collections can hold both homogeneous and heterogeneous data's.
Every collection follows some standard data structures.
Collection provides many useful built in methods for traversing,sorting and search.

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   Like         Discuss         Correct / Improve     java   collections   collections classes   advantages of collections over arrays   collections vs arrays   basic interview question     Asked in 6 Companies      basic        frequent

 Q280. Can we call constructor explicitly ?
Ans. Yes.

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   Like         Discuss         Correct / Improve     java   constructor   constructor chaining   oops   call constructor explicitly   yes-no
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 Q281. What is the difference between float and double?
Ans. Float can represent up to 7 digits accurately after decimal point, where as double can represent up to 15 digits accurately after decimal point.

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 Q282. Is it possible to compile and run a Java program without writing main( ) method?
Ans. Yes, it is possible by using a static block in the Java program.

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   Like         Discuss         Correct / Improve     java   main   static block   compile   yes-no

 Q283. According to Java Operator precedence, which operator is considered to be with highest precedence?Core Java
Ans. Postfix operators i.e () [] . is at the highest precedence.

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  Q284. What is Comparable Interface?Core Java
Ans. It is used to sort collections and arrays of objects using the collections.sort() and java.utils. The objects of the class implementing the Comparable interface can be ordered.

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   Like         Discuss         Correct / Improve     java   collections   comparable interface     Asked in 7 Companies      intermediate        frequent
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 Q285. What is Externalizable interface?Core Java
Ans. Externalizable is an interface which contains two methods readExternal and writeExternal. These methods give you a control over the serialization mechanism.

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   Like         Discuss         Correct / Improve     java   serialization   externalizable interface     Asked in 2 Companies      intermediate        rare

 Q286. What is Maven's order of inheritance?Maven
Ans. 1. parent pom
2. project pom
3. settings
4. CLI parameters

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   Like         Discuss         Correct / Improve     maven   build technologies   pom.xml   parent pom   project pom   build management
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 Q287. What is a Mojo?Maven
Ans. A mojo is a Maven plain Old Java Object. Each mojo is an executable goal in Maven, and a plugin is a distribution of one or more related mojos.

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   Like         Discuss         Correct / Improve     maven   build technologies   mojo

 Q288. What are the features of encapsulation ?Core Java
Ans. Combine the data of our application and its manipulation at one place.

Encapsulation Allow the state of an object to be accessed and modified through behaviors.

Reduce the coupling of modules and increase the cohesion inside them.

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  Q289. Write a method to check if input String is Palindrome?Core Java
Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

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   Like         Discuss         Correct / Improve     java   string   stringbuilder   stringbuilder   string class   code   palindrome     Asked in 38 Companies      Basic        frequent

 Q290. Write a method that will remove given character from the String?Core Java
Ans. 
private static String removeChar(String str, char c) {    

   if (str == null)        

      return null;     

   

   return str.replaceAll(Character.toString(c), "");

}


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   Like         Discuss         Correct / Improve     java   string   string class   code   write code

 Q291. Why String is popular HashMap key in Java?Core Java
Ans. Since String is immutable, its hashcode is cached at the time of creation and it doesnt need to be calculated again. This makes it a great candidate for key in a Map and its processing is fast than other HashMap key objects. This is why String is mostly used Object as HashMap keys.

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   Like         Discuss         Correct / Improve     java   string class   string   immutable  immutability   hashmap   immutable  immutability   hashcode   hash code   advanced     Asked in 2 Companies      expert        frequent

 Q292. What does String intern() method do?Core Java
Ans. intern() method keeps the string in an internal cache that is usually not garbage collected.

Moreover provide reference for scp object for corresponding string object present in heap memory.

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 Q293. How substring() method of String class create memory leaks?Core Java
Ans. substring method would build a new String object keeping a reference to the whole char array, to avoid copying it. Hence you can inadvertently keep a reference to a very big character array with just a one character string.

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Very frequently asked in HCL Tech ( Based of 4 inputs )
  Q294. Write a program to reverse a string iteratively and recursively ?Core Java
Ans. Using String method -

new StringBuffer(str).reverse().toString();

Iterative -

public static String getReverseString(String str){
StringBuffer strBuffer = new StringBuffer(str.length);
for(int counter=str.length -1 ; counter>=0;counter--){
strBuffer.append(str.charAt(counter));
}
return strBuffer;
}

Recursive -

public static String getReverseString(String str){
if(str.length <= 1){
return str;
}
return (getReverseString(str.subString(1)) + str.charAt(0);
}

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   Like         Discuss         Correct / Improve     java   string   reverse   stringbuffer   string class   code     Asked in 6 Companies        frequent

  Q295. Write a Program to check if 2 strings are Anagrams ?Core Java
Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
if(!str2.contains(String.valueOf(c))){
System.out.println("Strings are Anagrams");
anagram = false;
}

if(anagram == true){
System.out.println("Strings are not Anagrams");
}
}
}

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   Like         Discuss         Correct / Improve      check if 2 strings are Anagrams     Asked in 30 Companies      basic        frequent

 Q296. Difference between new operator and Class.forName().newInstance() ?
Ans. new operator is used to statically create an instance of object. newInstance() is used to create an object dynamically ( like if the class name needs to be picked from configuration file ). If you know what class needs to be initialized , new is the optimized way of instantiating Class.

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 Q297. Difference between ArrayList and LinkedList ?
Ans. LinkedList and ArrayList are two different implementations of the List interface. LinkedList implements it with a doubly-linked list. ArrayList implements it with a dynamically resizing array.

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   Like         Discuss         Correct / Improve     java   collections   list   arraylist   linkedlist   difference between      basic        frequent

 Q298. What are the pre-requisite for the collection to perform Binary Search ?
Ans. 1. Collection should have an index for random access.
2. Collection should have ordered elements.

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   Like         Discuss         Correct / Improve     java   collections   search algorithm   search   binary search   at&t      intermediate

 Q299. Which of the following syntax is correct ?import static java.lang.System.*;or static import java.lang.System.*;Core Java
Ans. import static java.lang.System.*;

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 Q300. What will be the output of following Code ?

class BuggyBread {
   public static void main(String[] args) {
      String s2 = "I am unique!";
      String s5 = "I am unique!";

      System.out.println(s2 == s5);
   }
}		Core Java
Ans. true, due to String Pool, both will point to a same String object.

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