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Can there be an abstract class with no abstract methods in it?
Can there be an abstract class with no abstract methods in it? yes.
2013-02-01, 1820👍, 0💬

What is the difference between an if statement and a switch statement?
What is the difference between an if statement and a switch statement? The if statement is used to select among two alternatives. It uses a boolean expression to decide which alternative should be executed. The switch statement is used to select among multiple alternatives. It uses an int expression...
2013-02-01, 1810👍, 0💬

What are the problems faced by Java programmers who don't use layout managers?
What are the problems faced by Java programmers who don't use layout managers? Without layout managers, Java programmers are faced with determining how their GUI will be displayed across multiple windowing systems and finding a common sizing and positioning that will work within the constraints impo...
2013-01-31, 1806👍, 0💬

What are the two basic ways in which classes that can be run as threads may be defined?
What are the two basic ways in which classes that can be run as threads may be defined? A thread class may be declared as a subclass of Thread, or it may implement the Runnable interface.
2013-01-31, 1784👍, 0💬

Which Component subclass is used for drawing and painting?
Which Component subclass is used for drawing and painting? Canvas
2013-01-30, 1882👍, 0💬

What methods are used to get and set the text label displayed by a Button object?
What methods are used to get and set the text label displayed by a Button object? getLabel() and setLabel()
2013-01-30, 1783👍, 0💬

What method must be implemented by all threads?
What method must be implemented by all threads? All tasks must implement the run() method, whether they are a subclass of Thread or implement the Runnable interface.
2013-01-29, 1826👍, 0💬

When is an object subject to garbage collection?
When is an object subject to garbage collection? An object is subject to garbage collection when it becomes unreachable to the program in which it is used.
2013-01-29, 1964👍, 0💬

Can an unreachable object become reachable again?
Can an unreachable object become reachable again? An unreachable object may become reachable again. This can happen when the object's finalize() method is invoked and the object performs an operation which causes it to become accessible to reachable objects.
2013-01-28, 1756👍, 0💬

How does a try statement determine which catch clause should be used to handle an exception?
How does a try statement determine which catch clause should be used to handle an exception? When an exception is thrown within the body of a try statement, the catch clauses of the try statement are examined in the order in which they appear. The first catch clause that is capable of handling the e...
2013-01-28, 1783👍, 0💬

What are the Object and Class classes used for?
What are the Object and Class classes used for? The Object class is the highest-level class in the Java class hierarchy. The Class class is used to represent the classes and interfaces that are loaded by a Java program.
2013-01-25, 1807👍, 0💬

What modifiers may be used with a top-level class?
What modifiers may be used with a top-level class? A top-level class may be public, abstract, or final.
2013-01-25, 1802👍, 0💬

What is a Java package and how is it used?
What is a Java package and how is it used? A Java package is a naming context for classes and interfaces. A package is used to create a separate name space for groups of classes and interfaces. Packages are also used to organize related classes and interfaces into a single API unit and to control ac...
2013-01-24, 1822👍, 0💬

What is the purpose of a statement block?
What is the purpose of a statement block? A statement block is used to organize a sequence of statements as a single statement group.
2013-01-24, 1878👍, 0💬

What is the difference between the prefix and postfix forms of the ++ operator?
What is the difference between the prefix and postfix forms of the ++ operator? The prefix form performs the increment operation and returns the value of the increment operation. The postfix form returns the current value all of the expression and then performs the increment operation on that value.
2013-01-23, 1947👍, 0💬

Can try statements be nested?
Can try statements be nested? Try statements may be tested.
2013-01-23, 1841👍, 0💬

To what value is a variable of the boolean type automatically initialized?
To what value is a variable of the boolean type automatically initialized? The default value of the boolean type is false.
2013-01-22, 1910👍, 0💬

What is the difference between a public and a non-public class?
What is the difference between a public and a non-public class? A public class may be accessed outside of its package. A non-public class may not be accessed outside of its package.
2013-01-22, 1936👍, 0💬

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, 2816👍, 0💬

What is numeric promotion?
What is numeric promotion? Numeric promotion is the conversion of a smaller numeric type to a larger numeric type, so that integer and floating-point operations may take place. In numerical promotion, byte, char, and short values are converted to int values. The int values are also converted to long...
2013-01-21, 1964👍, 0💬

What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body
What happens if a try-catch-finally statement does not have a catch clause to handle an exception that is thrown within the body of the try statement? The exception propagates up to the next higher level try-catch statement (if any) or results in the program's termination.
2013-01-18, 1845👍, 0💬

What is the ResourceBundle class?
What is the ResourceBundle class? The ResourceBundle class is used to store locale-specific resources that can be loaded by a program to tailor the program's appearance to the particular locale in which it is being run.
2013-01-18, 1896👍, 0💬

Can an abstract class be final?
Can an abstract class be final? An abstract class may not be declared as final.
2013-01-17, 1817👍, 0💬

What are three ways in which a thread can enter the waiting state?
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 I/O, 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 invok...
2013-01-17, 1835👍, 0💬

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