B
The code runs with no output.
Compilation fails because of an error in line 12.
Compilation fails because of an error in line 15.
Compilation fails because of an error in line 18.
第1题:
10. interface A { void x(); } 11. class B implements A { public void x() { } public voidy() { } } 12. class C extends B { public void x() {} } And: 20. java.util.List list = new java.util.ArrayList(); 21. list.add(new B()); 22. list.add(new C()); 23. for (A a:list) { 24. a.x(); 25. a.y();; 26. } What is the result?()
第2题:
11. static class A { 12. void process() throws Exception { throw new Exception(); } 13. } 14. static class B extends A { 15. void process() { System.out.println(”B”); } 16. } 17. public static void main(String[] args) { 18. new B().process(); 19. } What is the result?()
第3题:
A.123
B.Compilation fails because of an error in line 12.
C.Compilation fails because of an error in line 13.
D.Compilation fails because of an error in line 14.
E.A ClassCastException is thrown at runtime.
第4题:
Given: 11. static class A { 12. void process() throws Exception { throw new Exception(); } 13. } 14. static class B extends A { 15. void process() { System.out.println("B "); } 16. } 17. public static void main(String[] args) { 18. A a = new B(); 19. a.process(); 20. } What is the result? ()
第5题:
11.public static void main(String[]args){ 12.Object obj=new int[]{1,2,3}; 13.int[] someArray=(int[])obj; 14.for(inti:someArray)System.out.print(i+"") 15.} What is the result?()
第6题:
11. public static void main(String[] args) { 12. Object obj = new Object() { 13. public int hashCode() { 14. returns 42; 15. } 16. }; 17. System.out.println(obj.hashCode()); 18. } What is the result? ()
第7题:
package foo; import java.util.Vector; private class MyVector extends Vector { int i = 1; public MyVector() { i = 2; } } public class MyNewVector extends MyVector { public MyNewVector() { i = 4; } public static void main(String args[]) { MyVector v = new MyNewVector(); } } What is the result?()
第8题:
A.True
B.Not true
C.An exception is thrown at runtime.
D.Compilation fails because of an error at line 12.
E.Compilation fails because of an error at line 19.
第9题:
11. static classA { 12. void process() throws Exception { throw new Exception(); } 13. } 14. static class B extends A { 15. void process() { System.out.println(”B “); } 16. } 17. public static void main(String[] args) { 18.A a=new B(); 19. a.process(); 20.} What is the result?()
第10题:
B
The code runs with no output.
An exception is thrown at runtime.
Compilation fails because of an error in line 15.
Compilation fails because of an error in line 18.
Compilation fails because of an error in line 19.