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 Q301. What is an Object ?Core Java
Ans. Object is a run time entity whose state is stored in fields and behavior is shown via methods. Methods operate on an object's internal state and serve as the primary mechanism for object-to-object communication.

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 Q302. What is a Class ?Core Java
Ans. A class is a blue print or Mold using which individual objects are created. A class can contain fields and methods to describe the behavior of an object.

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 Q303. What are the sub classes of Exception class?Core Java
Ans. The Exception class has two main subclasses : IOException class and RuntimeException Class.

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   Like         Discuss         Correct / Improve     java   exceptions   exception class   ioexception   runtimeexception


 Q304. How finally used under Exception Handling?Core Java
Ans. The finally keyword is used to create a block of code that follows a try block. A finally block of code always executes, whether or not an exception has occurred.

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 Q305. Explain Set Interface?Core Java
Ans. It is a collection of element which cannot contain duplicate elements. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited.

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 Q306. What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?Core Java
Ans. The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented

  Sample Code for InputStream

  Sample Code for OutputStream

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   Like         Discuss         Correct / Improve     java   file io   streams   reader class   writer class   inputstream   outputstream   stream  file handling


 Q307. What is the difference between a break statement and a continue statement?Core Java
Ans. Break statement results in the termination of the statement to which it applies (switch, for, do, or while). A continue statement is used to end the current loop iteration and return control to the loop statement.

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 Q308. What is the purpose of the System class?Core Java
Ans. The purpose of the System class is to provide access to system resources.

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 Q309. Variable of the boolean type is automatically initialized as?Core Java
Ans. The default value of the boolean type is false.

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 Q310. Can try statements be nested?Core Java
Ans. Yes

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 Q311. What is the Locale class?
Ans. The Locale class is used to tailor program output to the conventions of a particular geographic, political, or cultural region

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   Like         Discuss         Correct / Improve     java   locale   internationalization      intermediate        rare


 Q312. What is the difference between the size and capacity of a Vector?Core Java
Ans. The size is the number of elements actually stored in the vector, while capacity is the maximum number of elements it can store at a given instance of time.

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 Q313. What is an enumeration?Core Java
Ans. An enumeration is an interface containing methods for accessing the underlying data structure from which the enumeration is obtained. It allows sequential access to all the elements stored in the collection.

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 Q314. In a case where there are no instance variables what does the default constructor initialize?Core Java
Ans. Java expects the superclass ( Object Class ) constructor to be called while creation of any object. So super constructor is called in case there are no instance variables to initialize.

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 Q315. Difference between Encapsulation and Data Hiding ?
Ans. Data Hiding is a broader concept. Encapsulation is a OOP's centri concept which is a way of data hiding in OOP's.

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   Like         Discuss         Correct / Improve     java   oops   oops concepts   encapsulation   data hiding   build management      basic


 Q316. Difference between Abstraction and Implementation hiding ?
Ans. Implementation Hiding is a broader concept. Abstraction is a way of implementation hiding in OOP's.

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 Q317. What are the examples of Abstraction in Java ?
Ans. function calling - hides implementation details
wrapper classes
new operator - Creates object in memory, calls constructor

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  Q318. What is the use of HashCode in objects ?Core Java
Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc.

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 Q319. Will finally be called always if all code has been kept in try block ?Core Java
Ans. The only time finally won't be called is if you call System.exit() or if the JVM crashes first.

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 Q320. If you have access to a function that returns a random integer from one to five, write another function which returns a random integer from one to seven.Core Java
Ans. We can do that by pulling binary representation using 3 bits ( random(2) ).

getRandom7() {
   String binaryStr = String.valuesOf(random(2))+String.valuesOf(random(2))+String.valuesOf(random(2));
   binaryInt = Integer.valueOf(binaryStr);
   int sumValue=0;
   int multiple = 1;
   while(binaryInt > 0){
      binaryDigit = binaryInt%10;
      binaryInt = binaryInt /10;
      sumValue = sumValue + (binaryDigit * multiple);
      multiple = multiple * 2;
   }
}

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 Q321. Write a method to convert binary to a number ?Core Java
Ans.
convert(int binaryInt) {
   int sumValue=0;
   int multiple = 1;
   while(binaryInt > 0){
      binaryDigit = binaryInt%10;
      binaryInt = binaryInt /10;
      sumValue = sumValue + (binaryDigit * multiple);
      multiple = multiple * 2;
   }
   return sumValue;
}

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 Q322. Can we use Ordered Set for performing Binary Search ?
Ans. We need to access values on the basis of an index in Binary search which is not possible with Sets.

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 Q323. Difference between PATH and CLASSPATH ?Operating System
Ans. PATH is the variable that holds the directories for the OS to look for executables. CLASSPATH is the variable that holds the directories for JVM to look for .class files ( Byte Code ).

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 Q324. Which Java collection class can be used to maintain the entries in the order in which they were last accessed?
Ans. LinkedHashMap

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 Q325. Is it legal to initialize List like this ?


LinkedList l=new LinkedList();
Ans. No, Generic parameters cannot be primitives.

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 Q326. what will be the output ?

class Animal {
public void eat() throws Exception {
}
}

class Dog2 extends Animal {
public void eat(){}
public static void main(){
Animal an = new Dog2();
an.eat();
}
}
Core Java
Ans. Compile Time Error: Unhandled exception type Exception

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 Q327. What is the use of HTTPSession in relation to http protocol ?Java EE
Ans. http protocol on its own is stateless. So it helps in identifying the relationship between multiple stateless request as they come from a single source.

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 Q328. Why using cookie to store session info is a better idea than just using session info in the request ?Java EE
Ans. Session info in the request can be intercepted and hence a vulnerability. Cookie can be read and write by respective domain only and make sure that right session information is being passed by the client.

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 Q329. http protocol is by default ... ?Java EE
Ans. stateless

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 Q330. Can finally block throw an exception ?Core Java
Ans. Yes. Methods invoked from within a finally block can throw an exception. Failure to catch and handle such exceptions results in the abrupt termination of the entire try block.

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