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Java Collection
What is the default capacity and load factor in Java Collection? Explain its role.
Sarje
- Aug 20th, 2009
Default Capacity of any Collection say HashSet is 16. It means when you create a HashSet using its default constructor then first HashSet will be created to hold 16 elements or you can say that ...
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Nested and Inner Classes
What is the need of nested and inner classes in Java? Explain where they are useful?
Sarje
- Aug 20th, 2009
Using Inner classes you can write more efficient code and even reduce the typing work. Inner classes are frequently used in Event Handling. For example to MouseEvent event is handled in following exam...
msuresh70
- May 23rd, 2009
Nested class is static class wrapped inside the outer classInner class is non-static class wrapped inside the outer class which has access to the instance variables of outer class.
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Is the ternary operator written x : y
Z or x
james.vinett
- Aug 23rd, 2009
The ternary operator is written as:x ? y : zand reads:if( x ) then y else the result is returned and may be assigned.ex:int result = (2
rajanikanth
- Sep 15th, 2005
It is written x ? y : z.
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Argument Constructor
What is "no argument constructor " in Java?
arun4u33
- Sep 10th, 2009
If you do not provide any constructor in your program? then compiler implicitly provide an empty constructor(zero parameter).If you writes any default constructor or parameter constructor in your? program then compiler does not provide zero parameter constructor.
ashwini_geeks
- Sep 7th, 2009
The zero argument constructor is used to initialize the class. If we dont write a zero argument constructor also compiler creates one for intializing the variables
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Is marker interface haveing methods
VijayAravind
- Sep 18th, 2009
In Java Programming, Interfaces with no methods is called as Marker Interface. Marker Interfaces are implemented by the classes or their SUper class in order to do some functions. Marker interface are Serializable, clonable, Single Threaded Model, Event listenter.
sudha
- May 23rd, 2006
99% of marker interface have no methods because Runnable is a marker interface which has one method called as public void run()
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What is the difference between static binding and dynamic binding?
kumpsath
- Sep 19th, 2009
1. Statis Binding : Initialize the variable like, private static HashMap map=new HashMap(); 2. Dynamic Binding: Initialize the variable like, private HashMap map; and somewhere in the method do map=new HashMap(); Please let me kknow if any change is there...!
SrinivasaRao.T
- Jun 16th, 2006
Static Binding: if the binding is occur at compile time of our source code is called static bindingDynamic Binding: if the binding is occur when interpreter our class fine, then that binding is called Dynamic Binding.
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What is meant by Applet Flickering
pradyutb
- Sep 22nd, 2009
When an applet is executing some graphics using a thread, some color desolution will be happening, this is called as flickering.
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How to find the host from which the Applet has originated
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If the particular value is not found SQL DB (NULL), which data type is considered in JAVA in this case?
kumpsath
- Sep 19th, 2009
My Suggestion: It is based on the SQL db data type. Ex, If the column datatype is number (decimal), using auto-boxing Java will convert data into double.
sharath
- Sep 15th, 2006
Use ResultSet.wasNull() to check whether the retrieved value is null or not.
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What is the class in Swing to change the appearance of the Frame in Runtime.
pradyutb
- Sep 22nd, 2009
Graphics 2d g;JFrame f;g.dispose(); setPreferredSize(new Dimension(128+r.nextInt(128),128+r.nextInt(128))); f.pack();
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Is synchronised modifier
sudha
- May 23rd, 2006
Syncronised is a modifier
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Equals() and hashCode()
Why should we implement equals() and hashCode() while using hastable?
inder_gwl
- Sep 24th, 2009
You must override hashCode in every class that overrides equals(). Equal objects must have equal hash codes. In other words, If two objects are equal according to the equals (Object)method, then calli...
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AND
String str=new String("abc");
">Is there any difference between String str="abc";ANDString str=new String("abc");
sensashan
- Oct 12th, 2009
Yes there is a difference. In case of str = "abc" we are creating an anonymous object and assigning it the reference str. But in case of str = new String("abc"), we are actua...
vinaygadiraju
- Oct 23rd, 2008
class A {..String s1="abc";String s2=new String "abc";..}The first line creates (sort of, see below) the String "abc" in the String pool, and s1 points to it. The second ...
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Implement ArrayList
How do you implement ArrayList without using Collections in Java?
kneebrains
- Oct 30th, 2009
def size=10def loadfactor=0.75def myarray = Object[size]def cursor=0def threshold = (int)(size * loadfactor)def add(obj) if cursor < threshold ...
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Java Program to Count Number of Files
50,000 HTML files are in a folder on a windows machine. Among them, content of some files(not the file names) contain the sentence "SocioMaC-Jus' Follow!". Write a Java program to count the number of such files.
kneebrains
- Oct 30th, 2009
If you need to _search_ random strings - use lucene. Otherwise i think sarje has the answer. Can you not write the text parsing in the file filter ?
Sarje
- Aug 20th, 2009
You can count the number of .html .htm files having any pattern suppose "Ram" using following code.import java.io.*;import java.util.Scanner;public class HtmlFileFilter implements FileFilter...
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If we have two abstract classes A,B then can we extend both the classes in a single class?
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Can a double value be cast to a byte
Yes, a double value can be cast to a byte.
swags12
- Nov 2nd, 2009
Yes a double value can be cast to bytefor eg: b=bytedouble d=conversion b=(byte) d:output will be 329.142
Muthu
- Aug 2nd, 2007
Hi could you please explain how can a double valuebe able to convert in to byte since the memory value of double(16 byte) is greater than a byte.
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What is the diffrence between java.util.Date.*; and java.sql.Date.*;?
vaibhavsingla3
- Dec 15th, 2009
Java.util.date is a predefinesd library but java.sql.date is used strore date
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Difference between Throw & Throws
1)What is the difference between Throw & Throws?2)Explain the use of transient variable with example?
shanky_06
- Dec 22nd, 2009
Ans.1)With the use of 'throw' it mean that we are simply throwing the exception object(this is explicitly).but using 'throws' with method signature it mean that exception object is thrown implicitly by the method.
arunagar
- Dec 8th, 2009
For Question 1 - Throw we put in Catch block, when we want to throw the exception occured.Throws is written in the signature of the method, when we are anticipating some execption and we want that to ...
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JSP jspinit() method
Will you be able to override jspinit() methods? Justify
apgenius
- Jan 10th, 2010
Yes, we can. Infact its actually why it's there. We override the jspinit() when we want to make some initial database connections etc..Same goes for jspdestroy(), but _jspService() can't be overriden.
Java Interview Questions
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