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APPENDIX D
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(d) An enum type cannot be declared as abstract (b) is not correct, because without the enum type name, it would be a call to an instance method in a static context Any abstract method must be implemented by each enum constant
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(c) All enum types override the equals() method from the Object class The equals() method of an enum type compares its constants for equality according to reference equality (same as with the == operator) This equals() method is final
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(a) and (d) Declarations in (a) and (d) are overridden in each constant-specific class body Declarations in (b) and (c) are not overridden by the declarations in the constant-specific class bodies, because of the incompatible return type
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(c), (e), (f), and (g) Note how the nested enum type constants are accessed Enum constants of an enum type can be compared, and an enum constant is an instance of its enum type
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(d) Enum constants can be used as case labels and are not qualified with the enum type name in the case label declaration The switch expression is compatible with the case labels, as the reference this will refer to objects of the enum type Scale5, which is the type of the case labels The call to the method getGrade() returns a char value, which in this case is 'C'
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(d), (f), and (g) A nested enum type must be declared inside a static member type, like (2), (3) and (5) Note that a nested enum type is implicitly static, and the keyword static is not mandatory in this case An enum type cannot be local, as static member types cannot be declared locally
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(a), (b), and (d) The static method values() returns an array with the enum constants for the specified type The final method name() always returns the name of the enum constant There is no names() method for enums in the Java standard library The loop in (d) only converts the array of enums to a list, and iterates over this list The argument Directionclass is not an array and, therefore, an illegal argument to the asList() method
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APPENDIX D
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(b) A constructor in the enum type is called for each enum constant created, when the enum type is loaded
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(d) In Java, arrays are objects Each array object has a final field named length that stores the size of the array
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(a) Java allows arrays of length zero Such an array is passed as argument to the main() method when a Java program is run without any program arguments
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(c) The [] notation can be placed both after the type name and after the variable name in an array declaration Multidimensional arrays are created by constructing arrays that can contain references to other arrays The expression new int[4][] will create an array of length 4, which can contain references to arrays of int values The expression new int[4][4] will create the same two-dimensional array, but will in addition create four more one-dimensional arrays, each of length 4 and of the type int[] References to each of these arrays are stored in the two-dimensional array The expression int[][4] will not work, because the arrays for the dimensions must be created from left to right
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(b) and (e) The size of the array cannot be specified, as in (b) and (e) The size of the array is given implicitly by the initialization code The size of the array is never specified in the declaration of an array reference The size of an array is always associated with the array instance (on the right-hand side), not the array reference (on the lefthand side)
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(e) The array declaration is valid, and will declare and initialize an array of length 20 containing int values All the values of the array are initialized to their default value of 0 The for(;;) loop will print all the values in the array, that is, it will print 0 twenty times
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(d) The program will print "0 false 0 null" when run All the instance variables, including the array element, will be initialized to their default values When concatenated with a string, the values are converted to their string representation Notice that the null pointer is converted to the string "null", rather than throwing a NullPointerException
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