How to avoid deadlock in Java?

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

A deadlock occurs when one thread has the control for A and tries to get the control for B while another thread has the control for B and tries to get the control for A. Each will wait forever for the...

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What is a static import? Why it is required?

venkat9060

 Profile Answers by venkat9060 Questions by venkat9060

• Nov 23rd, 2010

By using the static import we can reduce the code writing   for example     static import java.lang.System     class StaticTest{   &nbs...

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How to find the size of the (datatype) variable in java?in c we use sizeof() operator for for finding size of data type

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Mar 27th, 2012

There is no any particular function in java to find the size of the variable,because java removes the need for an application to know about how much of space needs to be reserved for a primitive value, an object or an array with a given number of elements.

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Please observe the following code....public class MyClass{ public static void main(String[] args) { try{ //code here }catch(Exception e) { System.out.println(e); } }}if the try block throws an ArithmeticException,NullPointerException,etc....we can handle the exception...Because those are the sub classes of Exception class...The Question...

Raghu

• Aug 19th, 2011

An exception type must be subtype of Throwable class.............

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How we implement pagination in j2ee

naveen potla

• Aug 27th, 2011

One way is fetching records from DB is using limit. For example if we have 1000 records to get in our result, you can fetch 100 records each time.

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Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Mar 7th, 2012

Look up SMS gateway. TO send a text, your really just sending any EMAIL with the SMS gateway. Its very easy.

for instance, versions is: yournumber@vtext.com .So just have the user input the phone number and their carrier and then send email out using JavaMail.

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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,...

bholanath das

• Dec 19th, 2011

Error at line 14 ");"+

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Why compiler does not provide default constructor if there is any parametrized constructor is provided by programmer.?

sam505

• Sep 14th, 2011

1)Compiler does not provide default constructor in case when we call parametrized constructor,because default constructor does not contain any parameter,it is parameter less constructor. 2)Normally d...

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How to know that a string require how much bytes in memory......

Ex. String s="abc";
String s=new String("abc");

How much memory is used for s and s2

sumathi

• Oct 6th, 2011

You can check
Runtime r = Runtime.getRuntime() ;
r.freeMemory() ;
before and after the creation of the new Object you can check the memory and by subtraction u can get the used memory. Not accurate but useful.

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What is the use of valueOf( ) method?

Shekhar Saxena

• Oct 10th, 2011

ValueOf method converts primitives into string

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What is the difference between object variable and class variable..?

SUMATHI

• Oct 6th, 2011

A Class is a template. An object is an instance of class. Every data member of an object contains its own value, where as Class only declares the data members. class contains one or more related obj...

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what is difference between instanceOf operator and getclass()

suraj20p

 Profile Answers by suraj20p Questions by suraj20p

• Oct 28th, 2011

instanceOf() is an operator used to find out whether an object is of instance of certain class or not eg: String str=new String(); //here str is an object of String class Sop(str.instanceOf(String));...

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What is the main advantage of java when compared to other programing languages...?

Shekhar Saxena

• Oct 10th, 2011

Java's main feature is platform independent and it can run anywhere on any platform so this makes Java good and comfortable.

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Lokesh M

 Profile Answers by Lokesh M Questions by Lokesh M

• Nov 28th, 2011

You can make use of getObjectSize function to find size of the Object.

Code
 

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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...

bholanath das

• Dec 19th, 2011

yes, x.equals(x1) will work .even though the reference is type of interface type but the object is type of child2 which is referred by this reference variable and this Child2 class does not have the ...

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Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Mar 7th, 2012

The methods IloCplex.readSolution and IloCplex.writeSolution is used to read a sol file in java script.

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In Java, a class is a type, similar to the built-in types int and boolean. Declaring a variable does not create an object. Explain the mechanism to create an object.

Nitin Vavdiya

 Profile Answers by Nitin Vavdiya Questions by Nitin Vavdiya

• Jan 30th, 2012

There are four different ways (I really dont know is there a fifth way to do this) to create objects in java: 1. Using new keyword This is the most common way to create an object in java. I read s...

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giriraj tiwari

• Jan 12th, 2012

Following command can be tried to check version of installed Java in our windows machine machine:

java -version

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I am trying to develop a small application. In this i have provided registration and login form. Username and password are stored in the JNDI server. This application is working fine. but when i am restarting the server, all the bind variables are deleting. why? i want to store them permanently. can you provide me the solution.
Thanks in advance.

Habib Ali

• Jun 11th, 2014

To avoid unwanted parsing in SQL Engine for identical statements, we issue a Bind Variable which is the property of Client Program...You cannot change the scenario here

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Lokesh M

 Profile Answers by Lokesh M Questions by Lokesh M

• Feb 10th, 2012

Cloneable interface is a marker interface and has no members. Cloneable is used whenever you want to manipulate a copy of the object without altering the original object. It is used to indicate that...

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