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What is the difference between a Scrollbar and a ScrollPane?
What is the difference between a Scrollbar and a ScrollPane? A Scrollbar is a Component, but not a Container. A ScrollPane is a Container. A ScrollPane handles its own events and performs its own scrolling. 2013-01-21, 3484👍, 0💬

What's the difference between J2SDK 1.5 and J2SDK 5.0?
What's the difference between J2SDK 1.5 and J2SDK 5.0? There's no difference, Sun Microsystems just re-branded this version. 2012-06-06, 3443👍, 0💬

Can main method be declared final?
Can main method be declared final? Yes, the main method can be declared final, in addition to being public static. 2013-07-02, 3388👍, 0💬

What classes of exceptions may be caught by a catch clause?
What classes of exceptions may be caught by a catch clause? A catch clause can catch any exception that may be assigned to the Throwable type. This includes the Error and Exception types. 2012-07-18, 3388👍, 0💬

Is exit a keyword in Java?
Is exit a keyword in Java? No. To exit a program explicitly you use exit method in System object. 2013-06-27, 3356👍, 0💬

Is delete a keyword in Java?
Is delete a keyword in Java? No, delete is not a keyword in Java. Java does not make use of explicit destructors the way C++ does. 2013-06-26, 3301👍, 0💬

What is the difference between preemptive scheduling and time slicing?
What is the difference between preemptive scheduling and time slicing? Under preemptive scheduling, the highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence. Under time slicing, a task executes for a predefined slice of time and the... 2013-06-20, 3288👍, 0💬

What is the immediate superclass of the Applet class?
What is the immediate superclass of the Applet class? Panel 2012-10-03, 3274👍, 0💬

How does Java handle integer overflows and underflows?
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 by the operation. 2013-06-06, 3226👍, 0💬

Are the imports checked for validity at compile time? e.g. will the code containing an import such as java.lang.ABCD compile?
Are the imports checked for validity at compile time? e.g. will the code containing an import such as java.lang.ABCD compile? Yes the imports are checked for the semantic validity at compile time. The code containing above line of import will not compile. It will throw an error saying,can not resolv... 2013-05-13, 3216👍, 0💬

What are the different scopes for Java variables?
What are the different scopes for Java variables? The scope of a Java variable is determined by the context in which the variable is declared. Thus a java variable can have one of the three scopes at any given point in time. 1. Instance : - These are typical object level variables, they are initiali... 2013-06-28, 3215👍, 0💬

What is the purpose of the enableEvents() method?
What is the purpose of the enableEvents() method? The enableEvents() method is used to enable an event for a particular object. Normally, an event is enabled when a listener is added to an object for a particular event. The enableEvents() method is used by objects that handle events by overriding th... 2012-08-03, 3213👍, 0💬

What does a well-written OO program look like?
What does a well-written OO program look like? A well-written OO program exhibits recurring structures that promote abstraction, flexibility, modularity and elegance. 2012-05-15, 3184👍, 0💬

Which containers use a border layout as their default layout?
Which containers use a border layout as their default layout? The Window, Frame and Dialog classes use a border layout as their default layout. 2012-05-30, 3181👍, 0💬

What is the purpose of the wait(), notify(), and notifyAll() methods?
What is the purpose of the wait(), notify(), and notifyAll() methods? The wait(),notify(), and notifyAll() methods are used to provide an efficient way for threads to communicate each other. 2012-06-14, 3179👍, 0💬

Why do threads block on I/O?
Why do threads block on I/O? Threads block on I/O (that is enters the waiting state) so that other threads may execute while the I/O Operation is performed. 2012-09-14, 3170👍, 0💬

Why do we need to use getSystemResource() and getSystemResources() method to load resources?
Why do we need to use getSystemResource() and getSystemResources() method to load resources? Because we want to look for resources strictly from the system classpath, These methods use the system ClassLoader to locate resources, which gives you stricter control of the resources used by the applicati... 2012-09-12, 3170👍, 0💬

Is String a primitive data type in Java?
Is String a primitive data type in Java? No String is not a primitive data type in Java, even though it is one of the most extensively used object. Strings in Java are instances of String class defined in java.lang package. 2013-06-25, 3146👍, 0💬

What if I do not provide the String array as the argument to the method?
What if I do not provide the String array as the argument to the method? Program compiles but throws a runtime error "NoSuchMethodError". 2013-05-03, 3142👍, 0💬

What is an object's lock and which object's have locks?
What is an object's lock and which object's have locks? An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have loc... 2012-07-12, 3127👍, 0💬

What is the default value of the local variables?
What is the default value of the local variables? The local variables are not initialized to any default value, neither primitives nor object references. If you try to use these variables without initializing them explicitly, the java compiler will not compile the code. It will complain abt the loca... 2013-07-01, 3126👍, 0💬

Can you call one constructor from another if a class has multiple constructors?
Can you call one constructor from another if a class has multiple constructors? Yes. Use this() syntax. 2012-09-06, 3115👍, 0💬

If I do not provide any arguments on the command line, then the String array of Main method will be empty or null?
If I do not provide any arguments on the command line, then the String array of Main method will be empty or null? It is empty. But not null. 2013-05-06, 3103👍, 0💬

What is scalability and performance?
What is scalability and performance? Performance is a measure of "how fast can you perform this task." and scalability describes how an application behaves as its workload and available computing resources increase. 2012-08-16, 3103👍, 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