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Overriding Defined Macros
How do you override a defined macro? You can use the #undef preprocessor directive to undefine (override) a previously defined macro. 2007-02-26, 7006👍, 0💬

Variables in Double Quoted Strings
Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example? In this example, "$a dollars" or "{$a} dollars" will print the same result. But in other cases, you need to use curly braces to protect variable names. For example, for following PHP script will prin... 2007-02-27, 7003👍, 0💬

Vector and ArrayList Classes
What is the main difference between a Vector and an ArrayList? Java Vector class is internally synchronized and ArrayList is not. 2007-03-03, 6983👍, 0💬

Invoking run() Method of a Thread
What invokes a thread's run() method? After a thread is started, via its start() method of the Thread class, the JVM invokes the thread's run() method when the thread is initially executed. 2007-03-03, 6976👍, 0💬

Multi-dimension Arrays
Write down the equivalent pointer expression for referring the same element a[i][j][k][l]? a[i] == *(a+i) a[i][j] == *(*(a+i)+j) a[i][j][k] == *(*(*(a+i)+j)+k) a[i][j][k][l] == *(*(*(*(a+i)+j)+k)+l) 2007-02-26, 6959👍, 0💬

Executing a PHP Script Using Command Line
How can I execute a PHP script using command line? Just run the PHP CLI (Command Line Interface) program and provide the PHP script file name as the command line argument. For example, "php myScript.php", assuming "php" is the command to invoke the CLI program. Be aware that if your PHP script was w... 2007-02-27, 6957👍, 0💬

Determing the Size of Allocated Memory Blocks
How can you determine the size of an allocated portion of memory? You can't, really. free() can , but there's no way for your program to know the trick free() uses. Even if you disassemble the library and discover the trick, there’s no guarantee the trick won’t change with the next release of the co... 2007-02-26, 6944👍, 0💬

Do You Know the Book "JUnit in Action"
Do You Know the Book "JUnit in Action"? You should know this book. It received some good reviews. Title: JUnit in Action Publisher: Manning Publications (October 1, 2003) Author: Vincent Massol, Ted Husted Abstract: A guide to unit testing Java applications (including J2EE applications) using the JU... 2008-01-07, 6942👍, 0💬

What is the difference between System exceptions and Application exceptions?
.NET INTERVIEW QUESTIONS - What is the difference between System exceptions and Application exceptions? All exception derives from Exception Base class. Exceptions can be generated programmatically or can be generated by system. Application Exception serves as the base class for all applicationspeci... 2010-04-27, 6923👍, 0💬

Variable Types
What are the types of variables x, y, y and u defined in the following code? #define Atype int* typedef int *p; p x, z; Atype y, u; Answer: x and z are pointers to int. y is a pointer to int but u is just an integer variable 2007-02-26, 6920👍, 0💬

Calling Base Class Methods
How can method defined in multiple base classes with same name be invoked from derived class simultaneously? class x { public: m1(); }; class y { public: m1(); }; class z: public x, public y { public: m1() { x::m1(); y::m1(); } }; 2007-02-26, 6908👍, 0💬

Server Push and Refresh
How can a servlet refresh automatically if some new data has entered the database? You can use a client-side Refresh or Server Push. 2007-04-03, 6901👍, 0💬

Virtual Functions in Java
Can you have virtual functions in Java? Yes, all functions in Java are virtual by default. This is actually a pseudo trick question because the word "virtual" is not part of the naming convention in Java (as it is in C++, C-sharp and VB.NET), so this would be a foreign concept for someone who has on... 2007-03-03, 6878👍, 0💬

Thread Safe JSP Pages
How can I implement a thread-safe JSP page? You can make your JSPs thread-safe by having them implement the SingleThreadModel interface. This is done by adding the directive &lt;%@ page isThreadSafe="false" %&gt; within your JSP page. 2007-04-03, 6876👍, 0💬

What is everyone using to write HTML documents?
How comfortable are you with writing HTML documents entirely by hand? Everyone has a different preference for which tool works best for them. Keep in mind that typically the less HTML the tool requires you to know, the worse the output of the HTML. In other words, you can always do it better by hand... 2007-03-03, 6809👍, 0💬

Determining If Symbols Are Defined or Not
How can you check to see whether a symbol is defined? You can use the #ifdef and #ifndef preprocessor directives to check whether a symbol has been defined (#ifdef) or whether it has not been defined (#ifndef). Can you define which header file to include at compile time? Yes. This can be done by usi... 2007-02-26, 6745👍, 0💬

Opening Files to Share with Other Programs
How can I open a file so that other programs can update it at the same time? Your C compiler library contains a low-level file function called sopen() that can be used to open a file in shared mode. Beginning with DOS 3.0, files could be opened in shared mode by loading a special program named SHARE... 2007-02-26, 6715👍, 0💬

Shift Operations
What will the following piece of code do? int f(unsigned int x) { int i; for (i=0; x!=0; x&gt;&gt;1) { if (x &amp; 0x1) i++; } return i; } Answer: returns the number of ones in the input parameter X. 2007-02-26, 6697👍, 0💬

Swapping Variables
Can you write a program to interchange 2 variables without using the third one? a = 7; b = 2; a = a + b; b = a - b; a = a - b; 2007-02-26, 6621👍, 0💬

How to force a page to go to another page using JavaScript?
How to force a page to go to another page using JavaScript? &lt;script language="JavaScript" type="text/javascript" >&lt;!-- location.href="http://newhost/ newpath/newfile.html";//-->&lt;/script> 2009-02-17, 6586👍, 0💬

Waiting State in a Thread
What are three ways in which a thread can enter the waiting state? A thread can enter the waiting state by invoking its sleep() method, by blocking on IO, by unsuccessfully attempting to acquire an object's lock, or by invoking an object's wait() method. It can also enter the waiting state by invoki... 2007-03-03, 6542👍, 0💬

How To Write a JUnit Test Method
How To Write a JUnit Test Method? This interview question is to check if you know the basic rules about writing a JUnit test method: You need to mark the method as a JUnit test method with the JUnit annotation: @org.junit.Test. A JUnit test method must be a "public" method. This allows the runner cl... 2008-01-22, 6404👍, 0💬

Native Method
What is a native method? A native method is a method that is implemented in a language other than Java. 2007-03-03, 6393👍, 0💬

Placing a Table in the Center of a Page
How do I center a table? You place a table in the center of a page with the help of CSS as shown in this example: In your HTML, use &lt;div class="center"> &lt;table>...&lt;/tabl e>&lt;/div> In your CSS, use div.center { text-align: center; } div.center table { margin-left: auto; mar... 2007-03-03, 6385👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML