90 

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

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

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;

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

93 Which code, inserted at line 14, allows the Sprite class to compile? (A) Direction d = NORTH; (B) Nav.Direction d = NORTH; (C) Direction d = Direction.NORTH; (D) Nav.Direction d = Nav.Direction.NORTH;

94 Which code fragment inserted at line 19, allows the Rainbow class to compile? (A) MyColor skyColor = BLUE; (B) MyColor treeColor = MyColor.GREEN; (C) if(REDgetRGB() ＜ BLUEgetRGB()){} (D) Compilation fails due to other error(s) in the code. (E) MyColor purple = new MyColor(0xff00ff); (AB) MyColor purple = MyColor.BLUE + MyColor.RED;

95 What is the result? (A) test (B) null (C) An exception is thrown at runtime. (D) Compilation fails because of an error in line 1. (E) Compilation fails because of an error in line 4. (AB) Compilation fails because of an error in line 5.

複選題96 Which code should be inserted at line 1 of Demo.java to compile and run Demo to print "pizzapizza"? (A) import utils.*; (B) static import utils.*; (C) import utils.Repetition.*; (D) static import utils.Repetition.*; (E) import utils.Repetition.twice(); (AB) import static utils.Repetition.twice; (AC) static import utils.Repetition.twice;