nnandurkar

 Profile Answers by nnandurkar Questions by nnandurkar

• Jun 23rd, 2010

Hashtable is syncronised where as HashMap is not. Hence, HashMap is faster.Hasttable does not allow any null value as either key or value. However, HashMap allows multiple null values and one nul...

kayalsuku

 Profile Answers by kayalsuku Questions by kayalsuku

• Jun 2nd, 2008

HashMap is an unordered and unsorted map. Allow one null key and many null values. Lists are collections that maintain their elements in order, and can contain duplicates. Set interface do not a...

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Visithra.G

• Oct 6th, 2020

It is essential to catch declare throws clause for checked exceptions unchecked exception need not be handled.

sampra

 Profile Answers by sampra Questions by sampra

• Feb 14th, 2008

no only compile time exception sud be catched we cat catch runtim excep

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KanikaKG  

 Profile Answers by KanikaKG Questions by KanikaKG

• Member Since Jul-2008 | Aug 4th, 2008

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No. Java is not 100 % Pure OOP because of following three reasons:
1) It doesnot support Multiple inheritance.
2) It allows use of primitive data types which are not an objects.
3) It allows static methods to call without creating the instance.

This disobeys OOPs concepts?
Java isnt 100% pure OOPS coz if it were then everything should be classes and objects, whereas java still has primitive data type which violates the above said statement...SmallTalk is the only 100% pure OOPS language

Chaitra

• Jun 6th, 2019

Java is not a pure object oriented programming language because of the primitive data type.
But java can be made 100% object oriented programming language by making use of wrapper classes.

Amit Kumar

• May 21st, 2018

Sorry, I am completely agree that java is a pure object oriented language. First of all answer me one question , what do you mean by object oriented programming ? object oriented programming is a conc...

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ashok

• Oct 14th, 2018

Your example absolute good but, we cant serialize static and transient. if you want deserialize again and check it it goes to default values means that variables are new variables to deserialization class.

shanu

• May 9th, 2016

You cannot serialize static variable as they belong to class not obj. and serialization is all about object. static int x= 10; int y =5 , if you seralize both the ans will be 10 and 5. But wait 10 is...

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Ajay

• Sep 12th, 2018

The main reason is Inheritance. If you observe the methods in Object class, contains the basic methods that every class should contain and they are very basic features or functionalities that every class should have and support.

Also there are many reasons for that...

jawaharl0207

 Profile Answers by jawaharl0207 Questions by jawaharl0207

• Oct 22nd, 2009

Because it has methods like useful for all the classes, like wait, notify, notifyall, clone and gc, these methods are common use for all classes.

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Damanpreet Singh

• Sep 4th, 2018

String Pool is a separate memory location in Class Information Area which is differ from Heap. Anything which we write in double quotes always stored in String Pool

Gurumurthy Ramamurthy

• Mar 12th, 2018

String Pool or String Constant Pool or String Literal Pool refers to an area of HEAP where the String objects are stored. Once the String object is created in this area, cant be removed by garbage co...

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What is the output of the following program?class A{ public static void main(String[] s) { System.out.println(s[1] + s[2] + s[3]);}}java A 12345Options(i) 1(ii) 12(iii)1234(iv)234(v) Compilation Error

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abuthahir.d  

 Profile Answers by abuthahir.d Questions by abuthahir.d

• Member Since Jan-2008 | Apr 14th, 2008

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Khadar , i tried this code . it gives that exception

for the foll reason : 
 when u give a CLA(command line argument) , it will be inserted in the index 0 of the array and then will proceed to 1 ,2 ....

so as per the question , "12345" will be at s[0] . and length of that aray will be 1when u try to access s[1] , we are trying for 2nd element which is unavailable..... 


Hope this answers u  :-)

shyamasundar

• Jun 2nd, 2018

(v) Compilation Error

shani

• Mar 14th, 2018

(v) Compilation Error

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One of the "clean" features of the Java programming language is that it mandates a separation between interfaces (pure behavior) and classes (state and behavior). Interfaces are used in Java to specify the behavior of derived classes. Often you will come across interfaces in Java that have no behavior. In other words, they are just empty interface definitions. These are known as marker interfaces....

kavya

• May 9th, 2018

Example of Marker Interface in Java We have created the below three java files to make you understand. 1. MyMarkerInterface.java (which is own created marker interface) 2. ImplMarkerInterface.java (A ...

syam pujala

• Mar 29th, 2018

Purpose of marker interface is to separate object from normal objects. ex: if you want to serialize one object then that object must implement serializable interface which is marker interface.

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Mayank

• Mar 13th, 2018

I don't think that is right because if it was then changing the value inside the called function should reflect the change when the passed variable is accessed in calling function.

sourabharvikar3

 Profile Answers by sourabharvikar3 Questions by sourabharvikar3

• May 4th, 2011

what is point behind sending integer by reference???Still if you want to do so... lookclass Demo{private int i;public static void main(String[] ar){      Demo d=new Demo();&nb...

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which one is faster in execution Array List or Array? why?

Gaurav Singh

• Mar 12th, 2018

No, JVM is not platform independent. It is Platform dependent.

Kailash Dofe

• Jul 5th, 2017

JVM is platform dependent, each OS has its own JVM version. What makes JAVA platform independent is this platform dependent JVM. This JVM helps the intermediately compiled JAVA code(bytecode) to run o...

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akansha

• Feb 28th, 2018

As you say abstract class has no complete body that is why we cannot create object but if we completed this body after that we also cannot create object why?

Rowan Siwakoti (NepWeb)

• Jun 10th, 2016

We can create object of an abstract class indirectly by using anonymous inner class. Thank you :)

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If int=8 then how to solve ++a+a--*a---a++

gangadhara

• Dec 9th, 2017

74

Zaiggen

• Nov 27th, 2016

(++x)+(x--)*(x--)-(x++)
// 9 + 9 * 8 - 7 = 9 + (72) - 7 = 74

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harry

• Nov 2nd, 2017

Very first I would like to tell you that String not a data type its Final class and that present in java.lang package and its a drive class Question is that Why it is derived class

vivek

• Aug 26th, 2017

Strings are data types that can hold everything and by everything I mean primitives types as well as user defined types. Moreover the meaning of word string is something which connected for e.g a thre...

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What is need of polymorphism in Java? What could have happen if polymorphism is not present?

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syamala235  

 Profile Answers by syamala235 Questions by syamala235

• Member Since Mar-2010 | Apr 8th, 2010

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Polymorphism in simple terms means one name many forms. Polymorphism enables one entity to be used as a general category for different types of actions. The specific action is determined by the exact nature of the situation.

Polymorphism exists in three distinct forms in Java:
• Method overloading
• Method overriding through inheritance
• Method overriding through the Java interface

Prashant kumar gupta

• Oct 28th, 2017

We have different behaviors in different situations and in front of different people. A man behaves differently with his father, when he is with his friend he has different behavior. Another best exa...

suraj

• Jun 19th, 2017

Polymorphism means one thing in many form. or one person different behavior is called polymorphism.

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ashish_setia  

 Profile Answers by ashish_setia Questions by ashish_setia

• Member Since Oct-2006 | Oct 3rd, 2006

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check out this example

class Checkmain{
public static void main(String args[]){
args[1]="ashish";
System.out.println("hello ");
}
}
class Checkmain1 extends Checkmain{
public static void main(String args[]){
System.out.println("how r u");
}

}
class Jo{
public static void main(String args[]){
String S[]=new String[10] ;

Checkmain.main(S);
Checkmain1.main(S);
}}

vivek

• Aug 26th, 2017

Yes you can only do that by overriding main method signature for eg main(String[] args) to main(). Certainly there are no other ways to do that because JVM needs strings array arguments to take comma...

Dharmendra Singh

• Sep 15th, 2016

yes we can"java public class HelloWorld { // arguments are passed using the text field below this editor public static void main(String[] args) { String []s =new Str...

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Ashok

• Aug 3rd, 2017

Return Type is not part of a method signature..Kindly check again and dont put wrong answer on portal because it will confuse to other.

santh kumar

 Profile Answers by santh kumar Questions by santh kumar

• Dec 19th, 2006

It's java's Specification that describes like that the return type is not a part of method signature, whether it is method overloading or overriding. U clearly know that the type of parameters can be...

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Jyoti Mittal

• Jun 9th, 2017

Yes we can

Skk

• Apr 10th, 2017

You are missing static keyword in main method, that is why error is there.
public static final void main(String[] args) {
}

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Rohit Manjunath Balekundri

• Jun 8th, 2017

Java: is a object oriented language for building platform independent application with OOPS concepts with set of API provided by Oracle. Originally it was owned Sun micro systems.

Core Java: is a core/basic API to develop desktop applications.

Ankur

• May 31st, 2017

Core Java is part of Java. Java has Core Java (J2SE), J2EE, J2ME.

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ramu

• Jun 3rd, 2017

Java.lang.object class is the super class for all java classs

suil

• Jan 24th, 2017

Object class is parent class of all java classes.

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Reddy

• Feb 5th, 2017

Object class provides some common behaviors to all the objects
Cloning
Serialization
Garbage Collection etc.,

sushant

• Nov 17th, 2012

If you see the definition of class Object, it is defined as "Class Object is the root of the class hierarchy. Every class has Object as a superclass. All objects, including arrays, implement the metho...

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