86 

What are four valid examples of polymorphic method calls? (Choose four.) 

 1. x.a2(); 

 2. z.a2(); 

 3. z.c1(); 

 4. z.a1(); 

 5. y.c1();

 6. x.a1();
(A) 1246
(B) 123456
(C) 2345
(D) 13465

82 What is the result? (A) Compilation succeeds. (B) Compilation fails due to multiple errors. (C) Compilation fails due to an error only on line 20. (D) Compilation fails due to an error only on line 21. (E) Compilation fails due to an error only on line 22. (AB) Compilation fails due to an error only on line 12.

83 Which three statements are true? (Choose three.)  1. Compilation fails.  2. The code compiles and the output is 2.  3. If lines 16, 17 and 18 were removed, compilation would fail.  4. If lines 24, 25 and 26 were removed, compilation would fail.  5. If lines 16, 17 and 18 were removed, the code would compile and the output would be 2.  6. If lines 24, 25 and 26 were removed, the code would compile and the output would be 1. (A) 256 (B) 146 (C) 356 (D) 123

84 What is the result? (A) Afoo Afoo (B) Afoo Bfoo (C) Bfoo Afoo (D) Bfoo Bfoo (E) Compilation fails. (AB) An exception is thrown at runtime.

85 What is the result? (A) peep (B) bark (C) meow (D) Compilation fails. (E) An exception is thrown at runtime.

87 A team of programmers is involved in reviewing a proposed design for a new utility class, After some discussion, they realize that the current design allows other classes to access methods in the utility class that should be accessible only to methods within the utility class itself. What design issue has the team discovered? (A) Tight coupling (B) Low cohesion (C) High cohesion (D) Loose coupling (E) Weak encapsulation (AB) Strong encapsulation

88 Which Three statements are true? (Choose Three.)  1. A final method in class X can be abstract if and only if X is abstract.  2. A protected method in class X can be overridden by any subclass of X.  3. A private static method can be called only within other static methods in class X.  4. A non-static public final method in class X can be overridden in any subclass of X.  5. A public static method in class X can be called by a subclass of X without explicitly referencing the class X.  6. A method with the same signature as a private final method in class X can be implemented in a subclass of X.  7. A protected method in class X can be overridden by a subclass of X only if the subclass is in the same package as X. (A) 123 (B) 456 (C) 256 (D) 1256

複選題89 What two must the programmer do to correct the compilation errors? (Choose two.) (A) insert a call to this() in the Car constructor (B) insert a call to this() in the MeGo constructor (C) insert a call to super() in the MeGo constructor (D) insert a call to super(vin) in the MeGo constructor (E) change the wheelCount variable in Car to protected (AB) change line 3 in the MeGo class to super.wheelCount = 3;

90 What is the result? (A) s 14 (B) s 16 (C) s 10 (D) Compilation fails. (E) An exception is thrown at runtime.

91 A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command: java games.cards.Poker What allows the user to do this? (A) put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java (B) put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java/*.jar (C) Put Poker.jar in directory /stuff/java, and set the CLASSPATH to include /stuff/java/Poker.jar (D) put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include /stuff/java (E) put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include /stuff/java/*.jar (AB) put Poker.jar in directory /stuff/java/games/cards, and set the CLASSPATH to include /stuff/java/Poker.jar

92 Which command line correctly runs Commander? (A) java Commander (B) java com.sun.sjcp.Commander (C) java com/sun/sjcp/Commander (D) java -cp com.sun.sjcp Commander (E) java -cp com/sun/sjcp Commander