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Can we use Private static void main()Instead of public static void main()?
Guest
- Jan 16th, 2007
Hi u can use private static void main becoz it does not give any error while compiling but while executing u will get an exception.
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How do you implement arraylist without using collection framework?
SMART_PRATEEK2001
- Aug 1st, 2008
/* This only adds & removes the elts from an arraylist */class myArrayListSecond{ private static int maxsize; private static Object data[]; private static int index; public myA...
dgshivas
- Feb 25th, 2008
When ever you try to use arrayList ,indirectly you are using Collection frame work.List implements Collection interface
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What is the difference between one dimensional array and multidimensional array?
Answer
- Mar 29th, 2012
A one-dimensional array is a structured collection of components (often called array elements) that can be accessed individually by specifying the position of a component with a single index value.Two...
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Inheritance and Aggregation
What is the difference between inheritance and aggregation? When would you use one over the other
mvrao.bsc
- Jun 12th, 2008
In Inheritance we have to extend the class where as in Aggregation no need to extend.Directly we can make use of other class in current class by creating object of other class(if required).
mvrao.bsc
- Jun 12th, 2008
What is the difference between inheritance and aggregation? When would you use one over the other?
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Can HashMap store null values?If yes, how many?
Can HashMap store null values?If yes, how many?What is singleton class? Give one example.Please describe the difference between 'int' and 'Integer',what is the purpose of 'Integer', where should we use 'Integer' vs 'int'?
sushilbehera
- Jan 29th, 2010
Yes HashMap can store null values. Any number of null values can be stored.Please note null can be stored multiple times as value however only one time as key.
fcasttro
- Mar 22nd, 2008
Map Won't allow duplicates, So It will accept one null value.HashMap map = new HashMap();map.put(null, null);map.put(null, null); map.put(null, null);After adding 3 null key / value pairs. It will...
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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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Class Path
Why should we set class path and path environment variables while installing J2SE and why not while Turbo C?
richakharya
- Apr 10th, 2009
Set the PATH variable if you want to be able to conveniently run the JDK executables (javac.exe, java.exe, javadoc.exe, etc.) from any directory without having to type the full path of the command. If...
mnazhar
- Apr 9th, 2009
Because TurboC generates .exe files which include all the libraries and runtime references. While in Java generates .class files which requires JRE/JDK libraries at runtime which are searched in CLASS...
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Double Value
What happens when you add a double value to a String?
mani.sivapuram
- Mar 14th, 2011
Here consider String s="java"; Double d=new Double(1.4); Here when we write s="java" an object of type String is created and it is referenced to 's'.In the similar way when we write Doub...
Sarje
- Aug 20th, 2009
When you add Double value to a String first the double value will be converted to String and appended to original String and new compelet String object will be created.For exam:String str = "Ram";Double d = new Double(12.50d);str = str + d;now str is "Ram12.50"
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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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Interface and Abstract Class Usage
When will you use an interface and abstract class?
mani.sivapuram
- Mar 8th, 2011
the simple way we can answer is in interface we can provide only abstract methods(i.e the methods with out any implementation) and in abstract class we have abstract methods as well as concreate metho...
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Write a program that prompts the user to input three numbers.
The program should then output numbers in ascending order.
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Compareto and equals method
Difference between CompareTo and equals method.
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JUnit
What is JUnit and how it is used?
Satendra Kumar
- Nov 10th, 2014
JUnit is primary testing which is done by programmer to ensure that my code is a quality code.
we can used unit testing by creating test cases ........Abhishek Mishra
- Oct 10th, 2014
"java import org.junit.*; public class TestFoobar { @BeforeClass public static void setUpClass() throws Exception { // Code executed before the first test method ...
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Java - How to convert string to charArray ?
String str="Welcome To GeekInterview.com"
How can convert the above string to charArray without using any buit-in function in java?
Anyone to know the answer.please help me? i am new to learn java.Without main Method
How can we use method without using main method in JAVA?
What is the List interface
The List interface provides support for ordered collections of objects.
How does Java handle integer overflows and underflows
It uses those low order bytes of the result that can fit into the size of the type allowed bythe operation.
sandy2789
- Jan 13th, 2009
Difference Between Over Flow & Under Flow (JAVA) over flow = ex : array> [0][1][2][3][4] onl...
Sony V George
- Apr 5th, 2007
In java there is no point of overflow and underflow, it was there in C. For avoiding that java introduces type casting. Java will allow some more space from the defult space of primtive type.
What is the difference between the >> and >>> operators
The >> operator carries the sign bit when shifting right. The >>> zero-fills bits that havebeen shifted out.
Suraj Patil
- Aug 16th, 2014
When you deals with >> operator, only shifting is done by moving count times towards right without any replacement by zero. but when you deals with >>> operator them like >> this operator but only di...
infant
- Oct 5th, 2005
While dealing with (+)ve numbers there is no difference between >>> and >> operators.Both operators shift zeros into the upper bits of a number.The difference arises when dealing with (...
What is the range of the char type
The range of the char type is 0 to 2^16 - 1.
anita
- Apr 14th, 2015
According to me size of char type is 2^15-1..
sentientmachine
- Mar 9th, 2011
In java, the range of a char type is 0 to 65535 or0 to +((2^16)-1)Getting java to print out the MIN_VALUE and max value is tricky because the characters at position 0 and 65535 are unprintable. ...
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