Hi

I have interface in that interface 3 methods are there , after some days client said that,i want to add one more method in that interface ,so how can add 4 method so that the implemented class did not affect,

Thanks

Kalins Naik

sivapurammani

 Profile Answers by sivapurammani Questions by sivapurammani

• Jul 4th, 2013

If we implement any new method in Interface then by default that method is public and abstract, So the classes which are implementing that interface should implement that method that is one way in whi...

akii

• Apr 30th, 2013

Make a class abstract in this class you do not need to implement all methods of interface .

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Why platform independence is needed in real world ?

Praveen Kumar

• Dec 13th, 2012

Yes Java is Platform independent. When you compile your program, the java compiler provides you with a class file which consists of intermediate representation of the code. when you run this class fil...

SOWJANYA

• Dec 10th, 2012

Write once and run anywhere, that means if we develop one application on one operating system and for using it will execute on any operating system.

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Try to guess without running the program.

cpublic class IntegerClassExampleThree {
public static void main(String[] javalatte) {
Integer i = 400;
Integer j = 400;
if(i==j){
System.out.println("i==j is equal");
}else {
System.out.println("i==j is not equal");
}
}

}
public class IntegerClassExampleFour...

mani

• May 28th, 2014

Int value ends at 127 so upto 127 the hash code for int value is same.the answer is not equal and equal

onkar

• Dec 28th, 2013

1. First of all in one java file you can not have two public classes. 2. Second you will have to run a particular public class "java classname" and then its main method would run. Note - If there i...

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What is the difference b/w 2d array and hashmap?Where we have to use this?Explain ?

Thanks in advance

jahir

• Apr 9th, 2015

Array is fixed size and it has doesnt fixed data structure so there is no ready-mate methods for operating we write the explicitly write code burden for the programmer. Advantage: performance wise i...

kalyankarri

• Dec 26th, 2014

2d array is fixed in size ,hashmap size is not fixed 2d array rep.set of elements a[][],hashmap is (key,value) pair in 2d searching is slow ,it visits each n every element ,searchng is based on key ...

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Anil K Muraleedharan

• Aug 15th, 2015

Abstract classses are not complete by itself to be instantiated. There are some methods in that are not implemented. Hence you have to inherit it before using it. Even if you have implemented all methods in a class, if you put the keyword abstract, the class is deemed as abstract class.

Akhil behara

• Aug 13th, 2015

Personally I very much dislike this term (except of course when referring to the book of the same name). There is "Java SE" which is a perfectly valid name for "Java thats not EE or ME". "Core Java" i...

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Why interfaces is needed in Java?

sreenivasulu

• Dec 2nd, 2015

Of course that is right answer. Mainly using interface we are achieving abstraction in Java.

Sreenivasulu Medepalli

• Dec 2nd, 2015

If you don't know full implementation of that class at that situation we need to go for interface. In subclass we are implementing that interface and methods.

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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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Give me answer

ksureshbabu

 Profile Answers by ksureshbabu Questions by ksureshbabu

• Mar 5th, 2010

class Singletones implements Serializable{    /**     *      */    private static final long serialVersionUID = 6240073482570369797L; &...

Jagdeep Grewal

• Nov 8th, 2005

public class CSingleton {   private static CSingleton inst= null;private static int count=0;protected CSingleton() {            &n...

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sampra

 Profile Answers by sampra Questions by sampra

• Feb 20th, 2008

Like in c and c++ we have some mechanism to create the object and some mechnaishm to distroy the object .but in java  we have mechanism to create the object but we dont have any  mechanism t...

nuttyvarun

 Profile Answers by nuttyvarun Questions by nuttyvarun

• Feb 20th, 2008

Garbage collection (GC) is a form of automatic memory management. The garbage collector, or just collector, attempts to reclaim garbage, or memory used by objects that will never be accessed or mutated again by the application.

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An idea

vinaymudgil007

 Profile Answers by vinaymudgil007 Questions by vinaymudgil007

• Jun 3rd, 2008

Well the answer given by sarat  is a very good one & explains the concept.....

sasi

• Jul 20th, 2006

hi.....for example..take SUN as example..they provides..only  interfaces..that means..they give only NULL implementations..i.e.what is the returntype of the interface..what is the method & it...

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Sarje

 Profile Answers by Sarje Questions by Sarje

• Aug 19th, 2009

Since java.lang.StringBuffer class does not override equals(Object obj) method of the Object class then so you can not compare its objects directly. If you want to compare its objects then first conve...

rameshbabukm

 Profile Answers by rameshbabukm Questions by rameshbabukm

• May 26th, 2007

The Known fact is the stringbuffer strore the data as charcter array, so when when we do a append on the stringbuffer object it inserts the chars into that array.Thats why we got method which can very the initial capacity of the same.hope it clarifies the doubt?

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phanibhushan.g

 Profile Answers by phanibhushan.g Questions by phanibhushan.g

• Mar 12th, 2010

We can run as many JVMs as possible at the same time depending on the memory (RAM). Also the JVM instance can belong to any one of the java implementors like Sun JDK, JRockit etc parallely. For using ...

mytramesh

 Profile Answers by mytramesh Questions by mytramesh

• Apr 7th, 2006

Hai Friends you have to remember one thing.The Jvm is one.Butwe can have mamy jvm instances.  you open five commmand prompts and do java programs in all command prompts.All will execute.For ...

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Great Legendary Praveen S Wani

• Oct 29th, 2006

Dear Readers,To know when exactly static block gets loaded please see the example belowpublic class Test{static{//Do somthing}//do some declaration initalisation//Do some methods//Do some static ...

vardhan

• Nov 29th, 2005

When class object created

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Pls ans me

Muthuramakrishnan.K

• Dec 8th, 2006

Sometimes, we may not know until run time precisely how large of an array we need. At that situation, the collections framework defines arrayList.ArrayList is a variable length array of object referen...

siva kumar reddy

• Aug 10th, 2006

hi,these all collection objects are used to store the objects.arraylist is used to random access.linked list is maintains the order.but these are not thread safe.vector is a synchronised.it is used in...

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amit saini

• Jan 8th, 2007

Inner class

raju

• May 27th, 2006

Whenever we r implementing the keyevents,mouseevents at the time we r implementing all the methods with in that interface , Bcoz we r using Anonymous inner classes what ever methods  we want we can implement it.any wrong plz mail: send2kpraju@yahoo.com

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deepak

• Apr 15th, 2006

Collection is a java package that provides the facilities to work on a group of objects as a single unit.it contains intefaces and classes the provide this facility.

jalvarado

 Profile Answers by jalvarado Questions by jalvarado

• Jan 6th, 2006

Ok na

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jimmy514in

 Profile Answers by jimmy514in Questions by jimmy514in

• Oct 27th, 2010

And , I thought constructors were NOT inherited..what probably protected means , is that private..you cannot directly call that constructor..I am unsure, if you can use protected and inherit..please clarify1

jimmy514in

 Profile Answers by jimmy514in Questions by jimmy514in

• Oct 27th, 2010

What if I have a scenario?public class A{protected A(String str){//code block}public A(){this("name1");}public static void main(){new A();//now you can use the protected constructor..//or you can also use the static block to call the protected constructor..cant u?}}

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suma tv

• Feb 22nd, 2007

java servlets and jsp

Rajkumar

• Apr 24th, 2006

Hi Kaushik,          Its Raj here, I need to make a small correction in ur Post,As a ServletConfig is one per Servlet Instance and not for the Web App.Hope...

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ganesh

• May 25th, 2006

runtime poly morphism is resolved at runtime i.e the reference variable actually cares which object its presently pointing tocompile time polymorphish is resolved at compile time i.e the reference variable actually cares which type of object its actually rather than which object its pointing

rajev

• May 25th, 2006

Good

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muralidhar.9e

 Profile Answers by muralidhar.9e Questions by muralidhar.9e

• Sep 8th, 2010

In Java the variable initialization should be in order.  The order is: 1. Static block variables initialize at first 2. Static method of variables initialize second 3. Static variables initial...

sampra

 Profile Answers by sampra Questions by sampra

• Feb 15th, 2008

First of all declare a memory block according to data typeassign var nameinitite by def valuewassign orignal value

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