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.

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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

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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.

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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...

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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
public synchronized 
void singleProcess() {
// Insert code here
}

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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.

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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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pavan

• Jun 23rd, 2014

Example:- In c language windows 16-bit "c void main() { int a; printf(size of(x)); } o/p:- 2 byte windows 32-bit void main() { int a; ...

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Means, Map is a pert of Collection framework but not included in Collection....only List, Set and Queue are included ....Why?

siddhi parkar

• Jul 1st, 2014

Map in an either interface or class it only stores or maps key to the object.although its not a collection its fully integrated with collection in terms of collection-view of map.

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I am trying to generate ppt through Java using Apache POI API. I am able to create table, bulleted text etc using this API. Please answer the following two questions, if anyone is aware of this. 1. How to split text across two slides, if the row had to be broken across 2 slides because the row is so big that it can only be accommodated in 2 slide ? 2. How to re-size table cell , if the text...

ashishthakran

 Profile Answers by ashishthakran Questions by ashishthakran

• Jul 28th, 2014

A list of few more Java interview questions like

1. By default, Java is pass by reference or pass by value. How does it handle?

2. In which scenario, you will use custom exceptions in Java.

3. How does garbage collection work in Java

Omen

• Nov 8th, 2013

Try this Java Library, i hope it will solve your problem:

http://www.aspose.com/java/powerpoint-component.aspx

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kalyankarri

• Dec 27th, 2014

Callable stmt is used to call stored procedure,prepared stmts executes sql queries.

satyendra kumar

• Dec 2nd, 2014

Prepared statement available in java.sql package and its extends statement but callable statement is available in java.sql package and its extends prepared statement ....

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Bhavesh

• Feb 28th, 2015

To get the hierarchy of classes that I might need later.

We dont want the user to know what functionality it offers other than some important We also dont want user to use reflection to exploit functionalities

punyamca

• Feb 6th, 2015

For late binding purpose. to design a method so that a part of functionality has to be mentioned by end user(implementing class)

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utkarsh singhal

• Mar 6th, 2015

You can run any number of JVMs on a machine unless and until your machine can provide required resources like RAM to run JVM.
Similarly, you can install any number of JDKs on your machine.

Nagarjuna

• Feb 28th, 2015

JVM is a OS level process, If we observe Chrome browser - How many tabs you open those many processes will be created by the operating system. In the same way JRE is also designed to run multiple proc...

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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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Amit

• Jun 26th, 2015

"java package collections; import java.util.Arrays; public class MyArray { private Object[] myStore; private int actSize = 0; public MyArray(){ myStore = new Ob...

Yoyo

• Mar 22nd, 2015

@kalyankarri The questions says without an Arraylist

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Sandeep

• Jul 11th, 2015

Chaitanya, Can you please explain me, How join() works?
I am in a situation where two clients (two different threads) are sending data to server and job of server is to fetch data from one client (thread) and feed to another client (thread), but I am unable to identify threads.

Adham

• Jun 12th, 2014

Passing variables through global variable can result in unexpected problems as many threads may try to modify this variable at the same time.
Programing languages provide different ways to deal with this problem
as delegates and invocation, pipes, handlers and loppers.

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How switch from new tab to old tab and is this possible to use Applet and Swings in selenium?

veerendra

• Jul 23rd, 2015

You can use window handling in selenium webdriver. First get the handle of the parent window and write a for loop to switch to the child windows. String parentwdw=driver.getWindowHandle(); //write ...

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Sandip shelke

• Aug 10th, 2015

Yes there is separate stack for each thread.
Bcoz suppose i have created two thread & I am writing a for loop in run method
which incrment from 1 to 10
void run()
{
for(int i=1;i

hannarani

 Profile Answers by hannarani Questions by hannarani

• Apr 3rd, 2008

Yes. Every thread maintains its own separate stack, called Runtime Stack but they share the same memory. Elements of the stack are the method invocations, called activation records or stack frame. The activation record contains pertinent information about a method like local variables.

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