123
Compilation fails because of an error in line 12.
Compilation fails because of an error in line 13.
Compilation fails because of an error in line 14.
A ClassCastException is thrown at runtime.
第1题:
11. public static void main(String[] args) { 12. Integer i = uew Integer(1) + new Integer(2); 13. switch(i) { 14. case 3: System.out.println(”three”); break; 15. default: System.out.println(”other”); break; 16. } 17. } What is the result?()
第2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3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4题:
11.classA { 12. public void process() { System.out.print(”A “); } } 13. class B extends A { 14. public void process() throws RuntimeException { 15. super.process(); 16. if (true) throw new RuntimeException(); 17. System.out.print(“B”); }} 18. public static void main(String[] args) { 19. try { ((A)new B()).process(); } 20. catch (Exception e) { System.out.print(”Exception “); } 21. } What is the result?()
第5题:
11. public static void append(List list) { list.add(”0042”); } 12. public static void main(String[] args) { 13. List
第6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7题:
1 2 3
Compilation fails because of an error in line 12.
Compilation fails because of an error in line 13.
Compilation fails because of an error in line 14.
A ClassCastException is thrown at runtime.
第8题:
Exception
A Exception
A Exception B
A B Exception
Compilation fails because of an error in line 14.
Compilation fails because of an error in line 19.
第9题:
three
other
An exception is thrown at runtime.
Compilation fails because of an error on line 12.
Compilation fails because of an error on line 13.
Compilation fails because of an error on line 15.
第10题:
x = 0
x = 42
Compilation fails because of an error in line 2 of class Test2.
Compilation fails because of an error in line 3 of class Test1.
Compilation fails because of an error in line 4 of class Test2.
第11题:
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12题:
test
null
An exception is thrown at runtime.
Compilation fails because of an error in line 1.
Compilation fails because of an error in line 4.
Compilation fails because of an error in line 5.
第13题:
package test1; public class Test1 { static int x = 42; } package test2; public class Test2 extends test1.Test1 { public static void main(String[] args) { System.out.println(“x = “ + x); } } What is the result?()
第14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15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16题:
1. interface TestA { String toString(); } 2. public class Test { 3. public static void main(String[] args) { 4. System.out.println(new TestA() { 5. public String toString() { return “test”; } 6. } 7. } 8. } What is the result?()
第17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18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.
第19题:
42
An exception is thrown at runtime.
Compilation fails because of an error on line 12.
Compilation fails because of an error on line 16.
Compilation fails because of an error on line 17.
第20题:
Compilation succeeds.
Compilation fails because of an error at line 5.
Compilation fails because of an error at line 6.
Compilation fails because of an error at line 14.
Compilation fails because of an error at line 17.
第21题:
Compilation fails because of an error in line 19.
An exception is thrown at runtime.
B
Compilation fails because of an error in line 18.
Compilation fails because of an error in line 15.
The code runs with no output.
第22题:
Compilation fails because of an error in line 13.
A ClassCastException is thrown at runtime.
1 2 3
Compilation fails because of an error in line 14.
Compilation fails because of an error in line 12.
第23题:
Exception
a,b,Exception
Compilation fails because of an error in line 20.
Compilation fails because of an error in line 14.
A NullPointerException is thrown at runtime.