Q.--" I created five(5) thread instances,say "1","2","3","4","5" and start all of them at the same time,one after the other. The priorities for the threads are same.what should be done so that the threads run concurrently in the same order,i.e1,2,3,4,5(Is there any way at all)"?

Vijay

• Jan 10th, 2014

We can do that by using the join. In the second thread run method, we can call the join on first thread object. In the third thread run method, we can call the join on second thread object. Like this ...

mduhan

 Profile Answers by mduhan Questions by mduhan

• Apr 8th, 2013

We have to implement run method to create a thread.We need to make that method synchronized so that only one thread can go inside and control will be given to second only and only of first is completed.

Answer Question  Select Best Answer

When We should use Synchronization in Java and when we should not?

sivapurammani

 Profile Answers by sivapurammani Questions by sivapurammani

• Dec 16th, 2013

In simple terms we can say only one thread can act on selected resource(method or variable). Understanding the above sentence is as follows:: For example we are booking any ticket in a particular bu...

Yeswanth

• Dec 6th, 2013

If you want to allow only one thread at a time to access block of code or method then we will go for synchronization.

Code
span style="font-style: italic;">// Insert code here
}

Answer Question  Select Best Answer

sivapurammani

 Profile Answers by sivapurammani Questions by sivapurammani

• Dec 16th, 2013

Before introducing OOPS some other concepts are also introduced into the computer world, for example Procedure Oriented Language(The best example for this is C language) but these concepts are working...

mukesh jha

• Aug 8th, 2013

OOPS ?stands for object oriented programming . They are ? 1. Abstraction 2. Encapsulation 3. Inheritance 4. Polymorphism Abstraction is representation of ?some property without giving backgroun...

Answer Question  Select Best Answer

swapnil

• Sep 17th, 2013

Yes, array size in java is always 0 bz array is start with 0th location

sujatham

 Profile Answers by sujatham Questions by sujatham

• Aug 10th, 2007

Yes.Array can have zero length in java.

Answer Question  Select Best Answer

muskan

• Jul 29th, 2013

We have to write String args[] in main to run a program, because JVM(java virtual machine) can only recognize the main with string array as parameter, as starting method or a point.

Gajavelli shiva krishna

• Jul 18th, 2013

We write in string args[] in main in Java because string args[] means it allows string of array objects

Answer Question  Select Best Answer

What is the default value for toString() in java? Explain me with an example?

sivapurammani

 Profile Answers by sivapurammani Questions by sivapurammani

• Jul 10th, 2013

Default value is String representation of any Object. "java class Student { int rollNo; String name; public Student(int rollNo, String name){ this.rollNo = rollNo; this.name = n...

Nikhil

• Feb 21st, 2013

If toString() method is not overriden, it will return

public String toString() {
return getClass().getName() + "@" + Integer.toHexString(hashCode());
}

This is Object version of this method.

Answer Question  Select Best Answer

what is the difference between MVC1 & MVC2 in Java?

sivapurammani

 Profile Answers by sivapurammani Questions by sivapurammani

• Jul 10th, 2013

MVC(Model-View-Controller) :: This type of architecture makes our code to be reusable and separation of code. View :: Which presents the modal data, example if we are presenting any tabular data or c...

Prasad MN

 Profile Answers by Prasad MN Questions by Prasad MN

• Mar 11th, 2013

MVC1: Its a model view Controller architecture 1 that means all the presentation logic and business logic is mixed up. If any modification is required on its impact on the logic. Difficult ...

Answer Question  Select Best Answer

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 .

Answer Question  Select Best Answer

Read Best Answer

Editorial / Best Answer

Answered by: Srimant Misra

• Aug 12th, 2005

---

A static method can be synchronized. If you do so, the JVM will obtain a lock on the java.lang.Class instance associated with the object. It is similar to saying: 
synchronized(XYZ.class) 
{ 
}

Akii

• May 21st, 2013

If you synchronized on static method ,its lock on class level not only that method.

sampra

 Profile Answers by sampra Questions by sampra

• Mar 11th, 2008

Yes a method can be static and synchronized

Improve Answer

How an Treeset maintains the unique element? Which algorithm does it use?
What is the advantages over doing the same using the Arraylist manually?

Prasad MN

 Profile Answers by Prasad MN Questions by Prasad MN

• Mar 11th, 2013

Tree Set using internally HashTable for storage the objects using of key and values. Internally its using hashing mechanism. It displays the order on Ascending order.

Nikhil

• Feb 20th, 2013

It uses Red-Black tree alogorithm.

Answer Question  Select Best Answer

Can we decalre java inner class as private and protected?
If yes....please explain
If No....please explain

Priya

• Jan 28th, 2013

If it is a Regular Inner Class or Static Inner class private and protected modifiers can be applied. If it is a method local inner class, then we can use only abstract or final modifier.

Answer Question  Select Best Answer

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.

Answer Question  Select Best Answer

Please answer my question....

sowjanya

• Dec 10th, 2012

Based on hashcode the data is saved in hashtable.

manvi

• Sep 30th, 2012

Hashcode

Answer Question  Select Best Answer

If yes then how?

RAJASEKAR

• Oct 27th, 2012

No because we all know we cannot override static method. It is a final method.

main method is static.

avinash

• Sep 26th, 2012

We cant override static methods in java.if we take main() in sub class that is method hiding not overriding.

Answer Question  Select Best Answer

Ganga_busi

• Oct 25th, 2012

A NoClassDefFoundException is thrown if a class is referenced with Javas "new" operator (i.e. static loading) but the runtime system cannot find the referenced class.(that means whenever the JVM tr...

PriyankN

 Profile Answers by PriyankN Questions by PriyankN

• Mar 10th, 2011

To understand this better, run this example by keeping only one block uncommented,compiling and then removing class Test2 before running:public class NoClassDefFoundTest{ public static void main(Strin...

Answer Question  Select Best Answer

avinash

• Sep 26th, 2012

Yes,if exception related statements are there in constructor then it automatically throws an exception,if that is un-checked.

Jacqui

• Aug 13th, 2012

How can that be if constructors are not inheritable?

Answer Question  Select Best Answer

AMIT GURJAR

• Sep 21st, 2012

Sir please tell me that when a thread never return desired result then why we use it?

prabakaran29

 Profile Answers by prabakaran29 Questions by prabakaran29

• Aug 19th, 2012

Thread class can be extend only one class where as we using runnable interface can be implement many classes.so runnable interface is the best to implement the block of code

Answer Question  Select Best Answer

koti143

 Profile Answers by koti143 Questions by koti143

• Sep 7th, 2012

All collection classes are by default serialized.

John

• Apr 3rd, 2007

HashTable is synchronized

Answer Question  Select Best Answer

In one java class I have created this string String s1 = "abc";Now if I again use this same statement in a different java class, ie;String s2 = "abc";Will I get the same reference for "abc" in both the classes.

adarsh

• Jul 30th, 2012

"c public class stringreferencetest { public static void main(String[] args) { String s1 = "abc"; class AnotherClassString { String s2=""; public AnotherClassString() {...

sampra

 Profile Answers by sampra Questions by sampra

• Mar 13th, 2012

Both will point to same obj

Answer Question  Select Best Answer

Where should we use exactly abstract class and interfaces?

rpmnitp

 Profile Answers by rpmnitp Questions by rpmnitp

• Jul 13th, 2012

Interface is more generic in comparison to the Abstract class, hence when we want our implementing class to implement all the methods we should use Interface.

yuvaraj

• May 11th, 2012

All the methods declared inside an interface are abstract whereas abstract class must have at least one abstract method and others may be concrete or abstract. b) In abstract class, key word abstract...

Answer Question  Select Best Answer