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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. (156)
Read More169. 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. (152)
Read More163. Which arithmetic operations can result in the throwing of an ArithmeticException? Integer / and % can result in the throwing of an ArithmeticException. (141)
Read More157. 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 java.util.EventListener interface. (142)
Read More51. 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 needed to directly access data contained in any part of…
Read More145. 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. (117)
Read More139. 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 the running state. (115)
Read More127. 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, such as double values, to smaller values, such as byte…
Read More121. 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 only be accessed by classes or interfaces of the same…
Read More115. 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. (110)
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