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Why do threads block on I/O
Threads block on i/o (that is enters the waiting state) so that other threads may executewhile the i/o Operation is performed.
Read Best Answeramreenkhader
- Jan 20th, 2012
Thread gets blocked just because when two thread try to access the single resource simultaneously the threads get blocked and when one thread is using the resource other should be put to sleep state b...
saravanakumar
- Aug 28th, 2005
Sir, i want one doubt, how to open the new window from click the java frame using handling event. please give the idea to me. i know that it's a comment page. But u have using the doubt page. thanking u.
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What are the two ways to create the thread?
A) by implementing RunnableB) by extending ThreadC) Both a and bD) None of the above
ajaykumargurrala
- Jan 11th, 2012
In 2 ways by extending the Thread class & implementing Runnable interface
Hitesh Thakkar
- Oct 23rd, 2011
1. extends the Thread class
2. implements Runnable interface
answer is C -
Is the ternary operator written x : y ? z or x ? y : z ?
It is written x ? y : z.
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What is the difference between abstract class & Interface.
laxminarsaiah ragiri
- Dec 27th, 2011
Clone interface is marker interface which doest contains abstract methods. I want to say an empty interface.
Mohan Raja Gadikota
- May 31st, 2011
Features of an Abstract Class1. Abstract Class cannot be instantiated.2. An Abstract Class must be inherited.3. It may have Concrete Methods.4. It may have Abstract Methods.5. An Abstract Method of an...
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When might your program wish to run the garbage collecter? (Select multiple)
A) before it enters a compute-intense section of codeB) before it enters a memory-intense section of codeC) before objects are finalizedD) when it knows there will be some idle time
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Which one of the following is NOT a configurable JVM option?
Choice 1: Collect profiling and debugging statistics. Choice 2: Modify the number of bits a double variable uses. Choice 3 : Set the initial memory allocation pool size. Choice 4 :Modify the garbage collector's behavior. Choice 5 :Set the maximum memory allocation pool size.
hiranmoy
- Dec 27th, 2011
Modify the number of bits a double variable uses.
Saravanan_Sivaji
- Mar 7th, 2009
We can collect profiling and debugging statistics. we can set the initial memory allocation pool size. we can set the maximum memory allocation pool size. we can modify the gar...
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Can a main() method of class be invoked in another class
LAXMINARSAIAH RAGIRI
- Dec 27th, 2011
Yes, it is possible for these you should declare it as public.
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How do you send a message to the browser in JavaScript
LAXMINARSAIAH RAGIRI
- Dec 27th, 2011
Alert("Good Morning");
confirm("Success");krishnaprasad587
- Jun 7th, 2011
There are three ways to send a message in browser1.alert("message");2.confirm("message"):3.prompt("message");
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What is output of the following Java program?
i want output of this program:
javaimport javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public class Assimilator
{
public static void main(String[] args)
{
try
{
Properties props = new Properties();
props.put("mail.hosst", "mail.Pmc Tech.org");
Session mailConnection=Session.hetInstance(props,... -
Can a reference variable of Interface calls and equals method of Object call? If so, why?
javainterface X{
void m1();
void m2();
}
class Child2 extends Object implements X {
public void m1(){
System.out.println("Child2 M1");
}
public void m2(){
System.out.println("Child2 M2");
}
}
public class ParentChildInfterfaceDemo {
public static void main(String[] args){
X... -
What do you mean by static methods?
By using the static method there is no need creating an object of that class to use that method. We can directly call that method on that class. For example, say class A has static function f(), then we can call f() function as A.f(). There is no need of creating an object of class A.
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What do you know about the garbate collector
Imran Khan
- Dec 10th, 2011
Garbage collector uses for the memory deallocation, it does when we do not have a longer use of object.deallocation can be done both manually and automatically. We use the .gc function for the garbage collection.
jimmy514in
- May 17th, 2010
Garbage collection is used to collect objects which cannot be referenced. Which occupy system memory. The algorithm collects such references of objects and permits reuse of memory. It is u...
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What is TLD?
harris
- Dec 1st, 2011
! TLD is Top level domain, and usually the cheapest domain are dot info
leons0133
- Feb 12th, 2011
TLD is Top level domain. It is located in the right hand part of the domain name. The commonly used TLD are .com, .net, and .org. The .biz, .info and .ws are also used.
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How do you find the size of the Object in Java ?
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If a method is declared as protected, where may the method be accessed
A protected method may only be accessed by classes or interfaces of the same package orby subclasses of the class in which it is declared.
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Whether final method can be overridden or not?
H.D.A.sanoj
- Nov 22nd, 2011
We can not override a final method but it is possible to overload.when we use a final key word with a method it'll stop all modifications of the method so we can not override or inherit its properties
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What is the difference between throw and throws clause, explain in programatically
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Editorial / Best Answer
Answered by: sri
- Dec 24th, 2005
throw is used to throw an exception manually, where as throws is used in the case of checked exceptions, to reintimate the compiler that we have handled the exception. so throws is to be used at the time of defining a method and also at the time of calling that function, which rises an checked exception.
Prog. to explain diff. b/w throw and throw:
class MyException extends Exception //to create our own exception
{
public String toString() //overriding the method toString() to print the desired msg.
{
return "Can not divide a no. with one: "+"MyException";
}
public static void main(String args[]) throws MyException //use of throws
{
int a=Integer.parseInt(args[0]);
int b=Integer.parseInt(args[1]);
if(b==1)
throw new MyException(); // rises an MyException, if we try to divide a no. with 1
else
System.out.println((float)a/b);
}
}if we want to rise our own exception, we have to use either throws or to handle the exception by try-catch. if not, it gives the compile time error.
and throw is to rise the exception manually, In the above prog. I rised an exception when you try to divide a no with 1.(own Exception)
----sri
muthud
- Nov 22nd, 2011
Exception handling is done by two ways . One is handled by JVM and another is handled by User. JVM does Exception handling by using principle of Exception can be Caught or Declared . Caught is nothin...
micklesharma
- Jul 6th, 2010
Throws is a userdefined exception handling whereas throw is system defined....
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Java support RMI. What does this RMI stands for?
A) Random Memory InterfaceB) Remote Method InvocationC) Random Method InvocationD) Ramote Memory Interface
karthika01
- Nov 18th, 2011
RMI is basically stands for Remote Method Invocation. RMI is a the mainly use for set the APIs that allows to build distributed applications. RMI uses interfaces to define remote objects to turn local method invocations into remote method invocations.
Himanshu vij
- Sep 10th, 2011
Answer is B: Remote Method Invocation
Java Interview Questions
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