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What is thread?
What is thread? A thread is an independent path of execution in a system. 2012-06-07, 2594👍, 0💬

How can a GUI component handle its own events?
How can a GUI component handle its own events? A component can handle its own events by implementing the required event-listener interface and adding itself as its own event listener. 2012-12-06, 2593👍, 0💬

What advantage do Java's layout managers provide over traditional windowing systems?
What advantage do Java's layout managers provide over traditional windowing systems? Java uses layout managers to lay out components in a consistent manner across all windowing platforms. Since Java's layout managers aren't tied to absolute sizing and positioning, they are able to accommodate platfo... 2012-07-25, 2590👍, 0💬

What method is invoked to cause an object to begin executing as a separate thread?
What method is invoked to cause an object to begin executing as a separate thread? The start() method of the Thread class is invoked to cause an object to begin executing as a separate thread. 2012-10-29, 2587👍, 0💬

What is the List interface?
What is the List interface? The List interface provides support for ordered collections of objects. 2012-09-24, 2582👍, 0💬

What value does read() return when it has reached the end of a file?
What value does read() return when it has reached the end of a file? The read() method returns -1 when it has reached the end of a file. 2012-11-05, 2579👍, 0💬

What is a Container in a GUI?
What is a Container in a GUI? A Container contains and arranges other components (including other containers) through the use of layout managers, which use specific layout policies to determine where components should go as a function of the size of the container. 2012-08-13, 2577👍, 0💬

What is shallow copy or shallow clone in array cloning?
What is shallow copy or shallow clone in array cloning? Cloning an array invloves creating a new array of the same size and type and copying all the old elements into the new array. But such copy is called shallow copy or shallow clone because any changes to the object would be reflected in both arr... 2012-09-05, 2575👍, 0💬

In which case would you choose a static inner class?
In which case would you choose a static inner class? Interesting one, static inner classes can access the outer class's protected and private fields. This is both a positive and a negitive point for us since we can, in essence, violate the encapsulation of the outer class by mucking up the outer cla... 2012-09-07, 2574👍, 0💬

What are use cases?
What are use cases? A use case describes a situation that a program might encounter and what behavior the program should exhibit in that circumstance. It is part of the analysis of a program. The collection of use cases should, ideally, anticipate all the standard circumstances and many of the extra... 2012-08-15, 2573👍, 0💬

Can a double value be cast to a byte?
Can a double value be cast to a byte? Yes, a double value can be cast to a byte. 2012-10-25, 2566👍, 0💬

What is polymorphism?
What is polymorphism? Polymorphism means "having many forms". It allows methods (may be variables) to be written that needn't be concerned about the specifics of the objects they will be applied to. That is, the method can be specified at a higher level of abstraction and can be counted on to work e... 2012-08-14, 2566👍, 0💬

What event results from the clicking of a button?
What event results from the clicking of a button? The ActionEvent event is generated as the result of the clicking of a button. 2012-12-06, 2564👍, 0💬

How would you make a copy of an entire Java object with its state?
How would you make a copy of an entire Java object with its state? Have this class implement Cloneable interface and call its method clone(). 2013-04-16, 2563👍, 0💬

Why are the interfaces more flexible than abstract classes?
Why are the interfaces more flexible than abstract classes? --An interface-defined type can be implemented by any class in a class hierarchy and can be extended by another interface. In contrast, an abstract-class-defined type can be implemented only by classes that subclass the abstract class. --An... 2013-03-06, 2563👍, 0💬

What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?
What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy? The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented. 2012-11-15, 2562👍, 0💬

What interface must an object implement before it can be written to a stream as an object?
What interface must an object implement before it can be written to a stream as an object? An object must implement the Serializable or Externalizable interface before it can be written to a stream as an object. 2012-08-06, 2562👍, 0💬

When can an object reference be cast to an interface reference?
When can an object reference be cast to an interface reference? An object reference can be cast to an interface reference when the object implements the referenced interface. 2012-07-13, 2559👍, 0💬

There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java techniqu
There are two classes: A and B. The class B need to inform a class A when some important event has happened. What Java technique would you use to implement it? If these classes are threads I'd consider notify() or notifyAll(). For regular classes you can use the Observer interface. 2013-04-19, 2558👍, 0💬

What does it mean that a method or field is "static"?
What does it mean that a method or field is "static"? Static variables and methods are instantiated only once per class. In other words they are class variables, not instance variables. If you change the value of a static variable in a particular object, the value of that variable changes for all in... 2013-06-20, 2555👍, 0💬

Explain the usage of Java packages.
Explain the usage of Java packages. This is a way to organize files when a project consists of multiple modules. It also helps resolve naming conflicts when different packages have classes with the same names. Packages access level also allows you to protect data from being used by the non-authorize... 2012-08-09, 2555👍, 0💬

How do you create a read-only collection?
How do you create a read-only collection? The Collections class has six methods to help out here: 1. unmodifiableCollection(Collect ionc) 2. unmodifiableList(List list) 3. unmodifiableMap(Map m) 4. unmodifiableSet(Set s) 5. unmodifiableSortedMap(SortedMa pm) 6. unmodifiableSortedSet(SortedSe ts) If ... 2012-08-30, 2552👍, 0💬

If my class already extends from some other class what should I do if I want an instance of my class to be thrown as an exceptio
If my class already extends from some other class what should I do if I want an instance of my class to be thrown as an exception object? One can not do anytihng in this scenarion. Because Java does not allow multiple inheritance and does not provide any exception interface as well. 2013-05-30, 2551👍, 0💬

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💬

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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