4: ACCESS CONTROL in Java

Encoder QR Code in Java 4: ACCESS CONTROL
CHAPTER 4: ACCESS CONTROL
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What, if anything, is wrong with the following code
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abstract class MyClass { transient int j; synchronized int k; final void MyClass() {} static void f() {} }
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Select the one correct answer (a) (b) (c) (d) (e) (f) 425 The class MyClass cannot be declared abstract The field j cannot be declared transient The field k cannot be declared synchronized The method MyClass() cannot be declared final The method f() cannot be declared static Nothing is wrong with the code; it will compile successfully
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Which one of these is not a legal member declaration within a class Select the one correct answer (a) static int a; (b) final Object[] fudge = { null }; (c) abstract int t; (d) native void sneeze(); (e) final static private double PI = 314159265358979323846;
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Which statements about modifiers are true Select the two correct answers (a) (b) (c) (d) (e) Abstract classes can declare final methods Fields can be declared native Non-abstract methods can be declared in abstract classes Classes can be declared native Abstract classes can be declared final
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Which statement is true Select the one correct answer (a) The values of transient fields will not be saved during serialization (b) Constructors can be declared abstract (c) The initial state of an array object constructed with the statement int[] a = new int[10] will depend on whether the array variable a is a local variable or a field (d) A subclass of a class with an abstract method must provide an implementation for the abstract method (e) Only static methods can access static members
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PROGRAMMING EXERCISE
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Summary
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The following information was included in this chapter: the structure of a Java source file defining, using, and deploying packages explanation of class scope for members, and block scope for local variables discussion of accessibility (default, public) and other modifiers (abstract, final) for reference types applicability of member accessibility (default, public, protected, private) and other member modifiers (static, final, abstract, synchronized, native, transient, volatile)
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Programming Exercise
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41 Design a class for a bank database The database should support the following operations:
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deposit a certain amount into an account withdraw a certain amount from an account get the balance (ie, the current amount) in an account transfer an amount from one account to another
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The amount in the transactions is a value of type double The accounts are identified by instances of the class Account that is in the package commegabankcorprecords The database class should be placed in a package called commegabankcorpsystem The deposit, withdraw, and balance operations should not have any implementation, but allow subclasses to provide the implementation The transfer operation should use the deposit and withdraw operations to implement the transfer It should not be possible to alter this operation in any subclass, and only classes within the package commegabankcorpsystem should be allowed to use this operation The deposit and withdraw operations should be accessible in all packages The balance operation should only be accessible in subclasses and classes within the package commegabankcorpsystem
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Operators and Expressions
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Exam Objectives 31 Develop code that uses the primitive wrapper classes (such as Boolean, Character, Double, Integer, etc), and/or autoboxing & unboxing Discuss the differences between the String, StringBuilder, and StringBuffer classes
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Boxing/unboxing are covered in this chapter
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For primitive wrapper classes and string handling classes, see 10, p 423 76 Write code that correctly applies the appropriate operators including assignment operators (limited to: =, +=, -=), arithmetic operators (limited to: +, -, *, /, %, ++, --), relational operators (limited to: <, <=, >, >=, ==, !=), the instanceof operator, logical operators (limited to: &, |, ^, !, &&, ||), and the conditional operator ( : ), to produce a desired result Write code that determines the equality of two objects or two primitives
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