单选题1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()A Class AB Compilation fails.C An exception is thrown at line 2.D An exception is thrown at line 6.E The code executes with no output.

单选题
1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()
A

 Class A

B

 Compilation fails.

C

 An exception is thrown at line 2.

D

 An exception is thrown at line 6.

E

 The code executes with no output.


参考解析

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1. public class GoTest {  2. public static void main(String[] args) {  3. Sente a = new Sente(); a.go();  4. Goban b = new Goban(); b.go();  5. Stone c = new Stone(); c.go();  6. }  7. } 8.  9. class Sente implements Go {  10. public void go() { System.out.println(”go in Sente.”); }  11. }  12.  13. class Goban extends Sente {  14. public void go() { System.out.println(”go in Goban”); }  15. }  16.  17. class Stone extends Goban implements Go { }  18.  19. interface Go { public void go(); }  What is the result?() A、 go in Goban  go in Sente go in SenteB、 go in Sente  go in Sente go in GobanC、 go in Sente  go in Goban go in GobanD、 go in Goban go in Goban go in SenteE、 Compilation fails because of an error in line 17.

1. public class Target {  2. private int i = 0;  3. public int addOne() {  4. return ++i;  5. }  6. }  And:  1. public class Client {  2. public static void main(String[] args) {  3. System.out.println(new Target().addOne());  4. }  5. }  Which change can you make to Target without affecting Client?() A、 Line 4 of class Target can be changed to return i++;B、 Line 2 of class Target can be changed to private int i = 1;C、 Line 3 of class Target can be changed to private int addOne() {D、 Line 2 of class Target can be changed to private Integer i = 0;

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1. public class A {  2. void A() {  3. System.out.println(“Class A”);  4. }  5. public static void main(String[] args) {  6. new A();  7. }  8. }  What is the result?()  A、 Class AB、 Compilation fails.C、 An exception is thrown at line 2.D、 An exception is thrown at line 6.E、 The code executes with no output.

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