Java Advanced Java - Technical Questions and Answers

131.	What class of exceptions are generated by the Java run-time system?
	Answer: The Java runtime system generates RuntimeException and Error exceptions. Workspace Report errors ... Name : Email: View Answer

132.	What class allows you to read objects directly from a stream?
	Answer: The ObjectInputStream class supports the reading of objects from input streams. Workspace Report errors ... Name : Email: View Answer

133.	What is the difference between a field variable and a local variable?
	Answer: A field variable is a variable that is declared as a member of a class. A local variable is a variable that is declared local to a method. Workspace Report errors ... Name : Email: View Answer

134.	Under what conditions is an object's finalize() method invoked by the garbage collector?
	Answer: The garbage collector invokes an object's finalize() method when it detects that the object has become unreachable. Workspace Report errors ... Name : Email: View Answer

135.	What is the relationship between a method's throws clause and the exceptions that can be thrown during the method's execution?
	Answer: A method's throws clause must declare any checked exceptions that are not caught within the body of the method. Workspace Report errors ... Name : Email: View Answer

136.

What is the difference between the JDK 1.02 event model and the event-delegation model introduced with JDK 1.1?

137.	How is it possible for two String objects with identical values not to be equal under the == operator?
	Answer: The == operator compares two objects to determine if they are the same object in memory. It is possible for two String objects to have the same value, but located indifferent areas of memory. Workspace Report errors ... Name : Email: View Answer

138.	Why are the methods of the Math class static?
	Answer: So they can be invoked as if they are a mathematical code library. Workspace Report errors ... Name : Email: View Answer

139.	What Checkbox method allows you to tell if a Checkbox is checked?
	Answer: getState(). Workspace Report errors ... Name : Email: View Answer

140.	What state is a thread in when it is executing?
	Answer: An executing thread is in the running state. Workspace Report errors ... Name : Email: View Answer