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What is the relationship between an event-listener interface and an event-adapter class?
What is the relationship between an event-listener interface and an event-adapter class? An event-listener interface defines the methods that must be implemented by an event handler for a particular kind of event. An event adapter provides a default implementation of an event-listener interface. 2012-12-03, 2547👍, 0💬

How do you restrict a user to cut and paste from the html page?
How do you restrict a user to cut and paste from the html page? Using Servlet or client side scripts to lock keyboard keys. It is one of solutions. 2012-08-10, 2547👍, 0💬

What is the purpose of the finally clause of a try-catch-finally statement? garbage collector?
What is the purpose of the finally clause of a try-catch-finally statement? garbage collector? The finally clause is used to provide the capability to execute code no matter whether or not an exception is thrown or caught. 2012-10-23, 2546👍, 0💬

What is transient variable?
What is transient variable? Transient variable can't be serialize. For example if a variable is declared as transient in a Serializable class and the class is written to an ObjectStream, the value of the variable can't be written to the stream instead when the class is retrieved from the ObjectStrea... 2013-03-29, 2544👍, 0💬

Is there any other way that you can achieve inheritance in Java?
Is there any other way that you can achieve inheritance in Java? There are a couple of ways. As you know, the straight way is to "extends" and/or "implements". The other way is to get an instance of the class to achieve the inheritance. That means to make the supposed-super-class be a field member. ... 2012-08-29, 2543👍, 0💬

How can you write a loop indefinitely?
How can you write a loop indefinitely? for(;;)--for loop; while(true)--always true, etc. 2012-06-27, 2542👍, 0💬

Does the code in finally block get executed if there is an exception and a return statement in a catch block?
Does the code in finally block get executed if there is an exception and a return statement in a catch block? If an exception occurs and there is a return statement in catch block, the finally block is still executed. The finally block will not be executed when the System.exit(1) statement is execut... 2012-08-10, 2539👍, 0💬

What is an abstract method?
What is an abstract method? An abstract method is a method whose implementation is deferred to a subclass. 2012-11-01, 2538👍, 0💬

Can a top level class be private or protected?
Can a top level class be private or protected? No. A top level class can not be private or protected. It can have either "public" or no modifier. If it does not have a modifier it is supposed to have a default access.If a top level class is declared as private the compiler will complain that the "mo... 2013-05-15, 2536👍, 0💬

Whats the difference between notify() and notifyAll()?
Whats the difference between notify() and notifyAll()? notify() is used to unblock one waiting thread; notifyAll() is used to unblock all of them. Using notify() is preferable (for efficiency) when only one blocked thread can benefit from the change (for example, when freeing a buffer back into a po... 2013-02-15, 2535👍, 0💬

How to add menushortcut to menu item?
How to add menushortcut to menu item? If you have a button instance called aboutButton, you may add menu short cut by calling aboutButton.setMnemonic('A'), so the user may be able to use Alt+A to click the button. 2012-08-17, 2534👍, 0💬

What is the preferred size of a component?
What is the preferred size of a component? The preferred size of a component is the minimum component size that will allow the component to display normally. 2012-09-19, 2533👍, 0💬

Is sizeof a keyword?
Is sizeof a keyword? The sizeof operator is not a keyword. 2012-10-01, 2531👍, 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 wait for a shared resource. When a thread executes an object's wait() method, it enters the waiting state. It only enters the ready s... 2012-10-31, 2526👍, 0💬

How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?
How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters? Unicode requires 16 bits and ASCII require 7 bits. Although the ASCII character set uses only 7 bits, it is usually represented as 8 bits. UTF-8 represents characters using 8, 16, and 18 bit patterns. UTF-16 uses 16-bi... 2012-09-27, 2524👍, 0💬

What is the difference between a static and a non-static inner class?
What is the difference between a static and a non-static inner class? A non-static inner class may have object instances that are associated with instances of the class's outer class. A static inner class does not have any object instances. 2012-11-06, 2523👍, 0💬

This class (IncrementImpl) will be used by various threads concurrently; can you see the inherent flaw(s)? How would you improve
This class (IncrementImpl) will be used by various threads concurrently; can you see the inherent flaw(s)? How would you improve it? public class IncrementImpl { private static int counter = 0; public synchronized void increment() { counter++; } public int getCounter() { return counter; } } The coun... 2012-08-28, 2521👍, 0💬

What comes to mind when you hear about a young generation in Java?
What comes to mind when you hear about a young generation in Java? Garbage collection. 2013-04-14, 2520👍, 0💬

When is the ArrayStoreException thrown?
When is the ArrayStoreException thrown? When copying elements between different arrays, if the source or destination arguments are not arrays or their types are not compatible, an ArrayStoreException will be thrown. 2012-09-05, 2519👍, 0💬

Can one create a method which gets a String and modifies it?
Can one create a method which gets a String and modifies it? No. In Java, Strings are constant or immutable; their values cannot be changed after they are created, but they can be shared. Once you change a string, you actually create a new object. For example: String s = "abc"; //create a new String... 2012-08-24, 2519👍, 0💬

What is the default value of an object reference declared as an instance variable?
What is the default value of an object reference declared as an instance variable? Null unless we define it explicitly. 2013-05-15, 2518👍, 0💬

What is a task's priority and how is it used in scheduling?
What is a task's priority and how is it used in scheduling? A task's priority is an integer value that identifies the relative order in which it should be executed with respect to other tasks. The scheduler attempts to schedule higher priority tasks before lower priority tasks. 2012-10-12, 2516👍, 0💬

What happens when a thread cannot acquire a lock on an object?
What happens when a thread cannot acquire a lock on an object? If a thread attempts to execute a synchronized method or synchronized statement and is unable to acquire an object's lock, it enters the waiting state until the lock becomes available. 2012-11-14, 2514👍, 0💬

Can you write a Java class that could be used both as an applet as well as an application?
Can you write a Java class that could be used both as an applet as well as an application? A. Yes. Add a main() method to the applet. 2012-08-20, 2511👍, 0💬

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