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1 An instance variable is a nonstatic variable declared as a member of a class 2 An instance and an object both refer to a declaration of a class Programmers use these terms interchangeably 3 A class is like a cookie cutter that describes a new data type that consists of instance variables and method members
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4 A constructor is a method member of a class that is automatically called when an instance of the class is declared 5 Both are method members of a class However, a destructor is called automatically when an instance of a class goes out of scope The finalize() method member is called automatically, immediately before Java garbage collection releases the memory used by the instance of the class 6 Overloading a method member means that two or more method members of a class have the same method name but have different argument lists 7 You declare an instance of a class by using the new operator, as shown here:
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new myClass()
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8 An access specifier is used to limit access to the members of a class 9 Yes A constructor can have an argument list 10 A constructor is overloaded for many reasons, the most common of which is to give the programmer the opportunity to provide an initial value for instance variables
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1 An abstract method member of a class is a member method that must be overridden by a subclass that inherits the class that defines the abstract method member An abstract method member does not have a method body because an abstract method member cannot be called Only method members that override an abstract method member can be called 2 The is a rule of inheritance defines the relationship between a superclass and a subclass This rule requires that a subclass is a superclass For example, a student class (subclass) should be a person in order to inherit the person class 3 The keyword extends is used by a subclass to specify a superclass to inherit 4 The keyword final prohibits a method member that is designated as final from being overridden by a method member of a subclass 5 A superclass is a class that is being inherited by a subclass 6 An abstract class is a class that contains at least one abstract method member You cannot declare an instance of an abstract class
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7 The Object class is a class defined by Java that is automatically inherited by all other classes defined in Java, including the classes you define in your program 8 You can prevent a class from being inherited by designating the class with the keyword final 9 The keyword super is used in a subclass to explicitly reference method members of the superclass 10 Multilevel inheritance occurs when a subclass is inherited by another subclass
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1 An exception is something that doesn t normally occur In programming, two kinds of exceptions might occur with a program These are commonly referred to as compile errors and run-time errors Exception classes in Java handle run-time errors 2 A try block contains statements that are monitored for exceptions 3 A catch block immediately follows a try block and handles exceptions thrown by statements within the try block 4 If an exception is thrown and you didn t catch it within your program, Java s default handlers will respond to the exception 5 The Throwable class is the parent of the Exception class 6 You create your own exception class by inheriting Java s Exception class or any subclass of Exception, such as the RuntimeException class 7 If you define a method that might throw a checked exception but you don t catch the exception within the method definition, you must use the keyword throws in the method header and list the exceptions that can be thrown by the method 8 One exception class can be caught by a catch block You can use multiple catch blocks to catch multiple exceptions 9 The finally block contains statements that are executed regardless of whether an exception is thrown or not thrown 10 Yes, you can override methods inherited by your exception class from the Throwable class
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