181. What method must be implemented by all threads? All tasks must implement the run() method, whether they are a subclass of Thread or implement theRunnable interface.
169. 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 …
163. Which arithmetic operations can result in the throwing of an ArithmeticException? Integer / and % can result in the throwing of an ArithmeticException.
157. What is a compilation unit? A compilation unit is a Java source code file. 158. What interface is extended by AWT event listeners? All AWT event listeners extend the …
51. What is the difference between the File and RandomAccessFile classes? The File class encapsulates the files and directories of the local file system. The RandomAccessFile class provides the methods …
145. What is the Set interface? The Set interface provides methods for accessing the elements of a finite mathematical set. Sets do not allow duplicate elements.
139. What Checkbox method allows you to tell if a Checkbox is checked? getState(). 140. What state is a thread in when it is executing? An executing thread is in …
127. What is casting? There are two types of casting, casting between primitive numeric types and casting between object references. Casting between numeric types is used to convert larger values, …
121. Which class is the immediate superclass of the Container class? Component. 122. If a method is declared as protected, where may the method be accessed? A protected method may …
115. What is the purpose of the File class? The File class is used to create objects that provide access to the files and directories of a local file system.
