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Well-Written Object Oriented Programs
What does a well-written Object Oriented program look like? A well-written object oriented program exhibits recurring structures that promote abstraction, flexibility, modularity and elegance. 2007-03-03, 7443👍, 0💬

init() vs. Constructor
Can we use the constructor, instead of init(), to initialize servlet? Yes , of course you can use the constructor instead of init(). There's nothing to stop you. But you shouldn't. The original reason for init() was that ancient versions of Java couldn't dynamically invoke constructors with argument... 2007-04-03, 7422👍, 0💬

Anonymous Classes
Can an anonymous class be declared as implementing an interface and extending a class? An anonymous class may implement an interface or extend a superclass, but may not be declared to do both. 2007-03-03, 7399👍, 0💬

Including Source Files
What is the result of using Option Explicit? When writing your C program, you can include files in two ways. The first way is to surround the file you want to include with the angled brackets &lt; and &gt;. This method of inclusion tells the preprocessor to look for the file in the predefine... 2007-02-26, 7399👍, 0💬

How Do I Run JUnit Tests from Command Window
How Do I Run JUnit Tests from Command Window? To run JUnit tests from a command window, you need to check the following list: 1. Make sure that JDK is installed and the "java" command program is accessible through the PATH setting. Type "java -version" at the command prompt, you should see the JVM r... 2008-01-17, 7389👍, 0💬

What Is invokeLater() Method
When should the method invokeLater() be used? This method is used to ensure that Swing components are updated through the event-dispatching thread. 2007-03-03, 7347👍, 0💬

Constants
WHat will be the result of the following code? #define TRUE 0 // some code while (TRUE) { // some code } Answer: This will not go into the loop as TRUE is defined as 0. 2007-02-26, 7340👍, 0💬

Modulation Operations
Write an equivalent expression for x%8? x&amp;7 2007-02-26, 7333👍, 0💬

What Is the "@SuiteClasses" Annotation?
What Is the "@SuiteClasses" Annotation? "@SuiteClasses" is a class annotation defined in JUnit 4.4 in org.junit.runners.Suite.SuiteC lasses.It allows you to define a suite class as described in the previous question. By the way, the API document of JUnit 4.4 has a major typo for the org.junit.runner... 2008-01-31, 7329👍, 0💬

Using Macros for Contants
What is the benefit of using #define to declare a constant? Using the #define method of declaring a constant enables you to declare a constant in one place and use it throughout your program. This helps make your programs more maintainable, because you need to maintain only the #define statement and... 2007-02-26, 7325👍, 0💬

How do I install JUnit? First I will download the lastest version of JUnit.
How do I install JUnit? First I will download the lastest version of JUnit. Then I will extract all files from the downloaded file. The most important file should be the JUnit JAR file: junit-4.4.jar, which contains all JUnit class packages. To verify junit-4.4.jar, I will run the org.junit.runner.J... 2008-01-09, 7319👍, 0💬

How to make elements invisible?
How to make elements invisible? Change the "visibility" attribute of the style object associated with your element. Remember that a hidden element still takes up space, use "display" to make the space disappear as well. if ( x == y) { myElement.style.visibility = 'visible'; } else { myElement.style.... 2009-02-03, 7318👍, 0💬

States of a Thread
What are the high-level thread states? The high-level thread states are ready, running, waiting, and dead. 2007-03-03, 7317👍, 0💬

Searching Date in Linked Lists
How can I search for data in a linked list? Unfortunately, the only way to search a linked list is with a linear search, because the only way a linked list's members can be accessed is sequentially. Sometimes it is quicker to take the data from a linked list and store it in a different data structur... 2007-02-26, 7276👍, 0💬

What Is Hashing
What is hashing? To hash means to grind up, and that's essentially what hashing is all about. The heart of a hashing algorithm is a hash function that takes your nice, neat data and grinds it into some random-looking integer. The idea behind hashing is that some data either has no inherent ordering ... 2007-02-26, 7276👍, 0💬

What is page thrashing
What is page thrashing? Some operating systems (such as UNIX or Windows in enhanced mode) use virtual memory. Virtual memory is a technique for making a machine behave as if it had more memory than it really has, by using disk space to simulate RAM (random-access memory). In the 80386 and higher Int... 2007-02-26, 7274👍, 0💬

How to set a HTML document's background color?
How to set a HTML document's background color? document.bgcolor property can be set to any appropriate color. 2008-05-27, 7272👍, 0💬

How To Run a JUnit Test Class
How To Run a JUnit Test Class? A JUnit test class usually contains a number of test methods. You can run all test methods in a JUnit test class with the JUnitCore runner class. For example, to run the test class HelloTest.java described previously, you should do this: java -cp .;junit-4.4.jar org.ju... 2008-01-15, 7272👍, 0💬

Using Pointers
What print out will the folloging code produce? main() { char *p1=“name”; char *p2; p2=(char*)malloc(20); memset (p2, 0, 20); while(*p2++ = *p1++); printf(“%s\n”,p2);> } The pointer p2 value is also increasing with p1 . *p2++ = *p1++ means copy value of *p1 to *p2 , then increment both addresses (p... 2007-02-26, 7258👍, 0💬

How to create arrays in JavaScript?
How to create arrays in JavaScript? We can declare an array like this var scripts = new Array(); We can add elements to this array like this scripts[0] = "PHP"; scripts[1] = "ASP"; scripts[2] = "JavaScript"; scripts[3] = "HTML"; Now our array scrips has 4 elements inside it and we can print or acces... 2008-05-06, 7257👍, 0💬

FORM - How to Use IT
How do I use forms? The basic syntax for a form is: &lt;FORM ACTION="[URL]">...&lt;/FOR M>When the form is submitted, the form data is sent to the URL specified in the ACTION attribute. This URL should refer to a server-side (e.g., CGI) program that will process the form data. The form itsel... 2007-03-03, 7247👍, 0💬

"volatile" Modifier
when should the volatile modifier be used? The volatile modifier is a directive to the compiler's optimizer that operations involving this variable should not be optimized in certain ways. There are two special cases in which use of the volatile modifier is desirable. The first case involves memory-... 2007-02-26, 7243👍, 0💬

Function Calls
What will be printed as the resultof the operation below: int x; int modifyvalue() { return(x+=10); } int changevalue(int x) { return(x+=1); } void main() { int x=10; x++; changevalue(x); x++; modifyvalue(); printf("First output:%d\n",x); x++; changevalue(x); printf("Second output:%d\n",x); modifyva... 2007-02-26, 7229👍, 0💬

Strings vs. Character Arrays
What is the difference between strings and character arrays? A major difference is: string will have static storage duration, whereas as a character array will not, unless it is explicity specified by using the static keyword. Actually, a string is a character array with following properties: * the ... 2007-02-26, 7212👍, 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