10. class Line { 11. public class Point { public int x，y； } 12. public Point getPoint（） { return new Point（）； } 13. } 14. class Triangle { 15. public Triangle（） { 16. // insert code here 17. } 18. } Which code， inserted at line 16， correctly retrieves a local instance of a Point object？（） A、 Point p = Line.getPoint（）；B、 Line.Point p = Line.getPoint（）；C、 Point p = （new Line（））.getPoint（）；D、 Line.Point p = （new Line（））.getPoint（）；
10. class Line { 11. public class Point { public int x，y； } 12. public Point getPoint（） { return new Point（）； } 13. } 14. class Triangle { 15. public Triangle（） { 16. // insert code here 17. } 18. } Which code， inserted at line 16， correctly retrieves a local instance of a Point object？（）
- A、 Point p = Line.getPoint（）；
- B、 Line.Point p = Line.getPoint（）；
- C、 Point p = （new Line（））.getPoint（）；
- D、 Line.Point p = （new Line（））.getPoint（）；
相关考题：
1.public class GC{2.private Objec to；3.private void doSomethingElse（Object obj）{o=obj；}4.public void doSomething（）{5.Object o=new Object（）；6.doSomethingElse（o）；7.o=new Object（）；8.doSomethingElse（null）；9.o=null；10.}11.}When the doSomething method is called，after which line does the Object created in line 5 become available for garbage collection？（）A.Line5B.Line6C.Line7D.Line8E.Line9F.Line10
Click the Exhibit button. Which statement is true about the classes and interfaces in the exhibit?() A.Compilation will succeed for all classes and interfaces.B.Compilation of class C will fail because of an error in line 2.C.Compilation of class C will fail because of an error in line 6.D.Compilation of class AImpl will fail because of an error in line 2
Click the Exhibit button. Given:Which statement is true if a TestException is thrown on line 3 of class B? () A.Line 33 must be called within a try block.B.The exception thrown by method1 in class A is not required to be caught.C.The method declared on line 31 must be declared to throw a RuntimeException.D.On line 5 of class A, the call to method2 of class B does not need to be placed in a try/catch block.
Click the Exhibit button. Given:Which two statements are true if a NullPointerException is thrown on line 3 of class C? () A.The application will crash.B.The code on line 29 will be executed.C.The code on line 5 of class A will execute.D.The code on line 5 of class B will execute.E.The exception will be propagated back to line 27.
1. public class Outer{ 2. public void someOuterMethod（） { 3. // Line 3 4. } 5. public class Inner{} 6. public static void main（ String[]argv ） { 7. Outer o = new Outer（）； 8. // Line 8 9. } 10. } Which instantiates an instance of Inner？（） A、 new Inner（）； // At line 3B、 new Inner（）； // At line 8C、 new o.Inner（）； // At line 8D、 new Outer.Inner（）； // At line 8
Class TestException 1. public class TestException extends Exception { 2. } Class a： 1. public class a { 2. 3. public String sayHello（String name） throws TestException { 4. 5. if（name == null） { 6. throw new TestException（）； 7. } 8. 9. return “Hello “+ name； 10. } 11. 12. } A programmer wants to use this code in an application： 45. A a=new A（）； 46. System.out.println（a.sayHello（”John”））； Which two are true？（）A、 Class a will not compile.B、 Line 46 can throw the unchecked exception TestException.C、 Line 45 can throw the unchecked exception TestException.D、 Line 46 will compile if the enclosing method throws a TestException.E、 Line 46 will compile if enclosed in a try block， where TestException is caught.
1. public class a { 2. public void method1（） { 3. try { 4. B b=new b（）； 5. b.method2（）； 6. // more code here 7. } catch （TestException te） { 8. throw new RuntimeException（te）； 9. } 10. } 11. } 1. public class b { 2. public void method2（） throws TestException { 3. // more code here 4. } 5. } 1. public class TestException extends Exception { 2. } Given： 31. public void method（） { 32. A a=new a（）； 33. a.method1（）； 34. } Which is true if a TestException is thrown on line 3 of class b？（）A、 Line 33 must be called within a try block.B、 The exception thrown by method1 in class a is not required to be caught.C、 The method declared on line 31 must be declared to throw a RuntimeException.D、 On line 5 of class a， the call to method2 of class b does not need to be placed in a try/catch block.
1. public class A { 2. public void doit（） { 3. } 4. public String doit（） { 5. return “a”； 6. } 7. public double doit（int x） { 8. return 1.0； 9. } 10.} What is the result？（） A、 An exception is thrown at runtime.B、 Compilation fails because of an error in line 7.C、 Compilation fails because of an error in line 4.D、 Compilation succeeds and no runtime errors with class A occur.
10. class Line { 11. public static class Point { } 12. } 13. 14. class Triangle { 15. // insert code here 16. } Which code， inserted at line 15， creates an instance of the Point class defined in Line？（） A、 Point p = new Point（）；B、 Line.Point p = new Line.Point（）；C、 The Point class cannot be instatiated at line 15.D、 Line 1 = new Line（） ； 1.Point p = new 1.Point（）；
1. public class X { 2. public object m （） { 3. object o = new float （3.14F）； 4. object [] oa = new object [1]； 5. oa[0]= o； 6. o = null； 7. oa[0] = null； 10. return o； 9. } 10. } When is the float object created in line 3， eligible for garbage collection？（） A、 Just after line 5.B、 Just after line 6.C、 Just after line 7.D、 Just after line 8（that is， as the method returns）.
1.public class Test { 2.public static void main （String args[]） { 3.class Foo { 4.public int i = 3； 5.} 6.Object o = （Object） new Foo（）； 7.Foo foo = （Foo）o； 8.System.out.printIn（foo. i）； 9. } 10.} What is the result？（） A、 Compilation will fail.B、 Compilation will succeed and the program will print “3”C、 Compilation will succeed but the program will throw a ClassCastException at line 6.D、 Compilation will succeed but the program will throw a ClassCastException at line 7.
1. public class A { 2. 3. private int counter = 0； 4. 5. public static int getInstanceCount（） { 6. return counter； 7. } 8. 9. public A（） { 10. counter++； 11. } 12. 13. } Given this code from Class B： 25.A a1 =new A（）； 26. A a2 =new A（）； 27. A a3 =new A（）； 28. System.out.printIn（A.getInstanceCount（） ）； What is the result？（） A、 Compilation of class A fails.B、 Line 28 prints the value 3 to System.out.C、 Line 28 prints the value 1 to System.out.D、 A runtime error occurs when line 25 executes.E、 Compilation fails because of an error on line 28.
1. class Bar { } 1. class Test { 2. Bar doBar（） { 3. Bar b = new Bar（）； 4. return b； 5. } 6. public static void main （String args[]） { 7. Test t = new Test（）； 8. Bar newBar = t.doBar（）； 9. System.out.println（“newBar”）； 10. newBar = new Bar（）； 11. System.out.println（“finishing”）； 12. } 13. } At what point is the Bar object， created on line 3， eligible for garbage collection？（） A、 After line 8.B、 After line 10.C、 After line 4， when doBar（） completes.D、 After line 11， when main（） completes.
单选题1. public class X { 2. public object m （） { 3. object o = new float （3.14F）； 4. object [] oa = new object [1]； 5. oa[0]= o； 6. o = null； 7. oa[0] = null； 10. return o； 9. } 10. } When is the float object created in line 3， eligible for garbage collection？（）A Just after line 5.B Just after line 6.C Just after line 7.D Just after line 8（that is， as the method returns）.
单选题1. class A { 2. public String toString （） { 3. return “4”； 4. } 5. } 6. class B extends A { 7. public String toString （） { 8. return super.toString（） + “3”； 9. } 10. } 11. public class Test { 12. public static void main（String[]args） { 13. System.out.printIn（new B（））； 14. } 15. } What is the result？（）A Compilation succeeds and 4 is printed.B Compilation succeeds and 43 is printed.C An error on line 9 causes compilation to fail.D An error on line 14 causes compilation to fail.E Compilation succeeds but an exception is thrown at line 9.
多选题Click the Exhibit button. Given： Which two statements are true if a NullPointerException is thrown on line 3 of class C？（）AThe application will crash.BThe code on line 29 will be executed.CThe code on line 5 of class A will execute.DThe exception will be propagated back to line 27.EThe code on line 5 of class B will execute.
多选题Given： 10. class One { 11. void foo（） { } 12. } 13. class Two extends One { 14. //insert method here 15. } Which three methods， inserted individually at line 14， will correctly complete class Two？（）Apublic void foo（） { /* more code here */ }Bprivate void foo（） { /* more code here */ }Cprotected void foo（） { /* more code here */ }Dint foo（） { /* more code here */ }Evoid foo（） { /* more code here */ }
单选题1. public class A { 2. 3. private int counter = 0； 4. 5. public static int getInstanceCount（） { 6. return counter； 7. } 8. 9. public A（） { 10. counter++； 11. } 12. 13. } Given this code from Class B： 25.A a1 =new A（）； 26. A a2 =new A（）； 27. A a3 =new A（）； 28. System.out.printIn（A.getInstanceCount（） ）； What is the result？（）A Compilation of class A fails.B Line 28 prints the value 3 to System.out.C Line 28 prints the value 1 to System.out.D A runtime error occurs when line 25 executes.E Compilation fails because of an error on line 28.
单选题1. public class Outer{ 2. public void someOuterMethod（） { 3. // Line 3 4. } 5. public class Inner{} 6. public static void main（ String[]argv ） { 7. Outer o = new Outer（）； 8. // Line 8 9. } 10. } Which instantiates an instance of Inner？（）A new Inner（）； // At line 3B new Inner（）； // At line 8C new o.Inner（）； // At line 8D new Outer.Inner（）； // At line 8
单选题10. class Line { 11. public static class Point { } 12. } 13. 14. class Triangle { 15. // insert code here 16. } Which code， inserted at line 15， creates an instance of the Point class defined in Line？（）A Point p = new Point（）；B Line.Point p = new Line.Point（）；C The Point class cannot be instatiated at line 15.D Line 1 = new Line（） ； 1.Point p = new 1.Point（）；
单选题10. class Line { 11. public class Point { public int x，y； } 12. public Point getPoint（） { return new Point（）； } 13. } 14. class Triangle { 15. public Triangle（） { 16. // insert code here 17. } 18. } Which code， inserted at line 16， correctly retrieves a local instance of a Point object？（）A Point p = Line.getPoint（）；B Line.Point p = Line.getPoint（）；C Point p = （new Line（））.getPoint（）；D Line.Point p = （new Line（））.getPoint（）；
单选题Given: Which code, inserted at line 15, creates an instance of the Point class defined in Line?（）A Point p = new Point();B Line.Point p = new Line.Point();C The Point class cannot be instatiated at line 15.D Line l = new Line() ; l.Point p = new l.Point();
单选题1. class SuperClass { 2. public a geta（） { 3. return new a（）； 4. } 5. } 6. class SubClass extends SuperClass { 7. public b geta（） { 8. return new b（）； 9. } 10. } Which is true？（）A Compilation will succeed if a extends b.B Compilation will succeed if b extends a.C Compilation will always fail because of an error in line 7.D Compilation will always fail because of an error in line 8.
单选题1. public class GC { 2. private Object o； 3. private void doSomethingElse（Object obj） { o = obj； } 4. public void doSomething（） { 5. Object o = new Object（）； 6. doSomethingElse（o）； 7. o = new Object（）； 8. doSomethingElse（null）； 9.o=null； 10. } 11. } When the doSomething method is called， after which line does the Object created in line 5 become available for garbage collection？（）A Line 5B Line 6C Line 7D Line 8E Line 9F Line 10
单选题1. public class a { 2. public void method1（） { 3. try { 4. B b=new b（）； 5. b.method2（）； 6. // more code here 7. } catch （TestException te） { 8. throw new RuntimeException（te）； 9. } 10. } 11. } 1. public class b { 2. public void method2（） throws TestException { 3. // more code here 4. } 5. } 1. public class TestException extends Exception { 2. } Given： 31. public void method（） { 32. A a=new a（）； 33. a.method1（）； 34. } Which is true if a TestException is thrown on line 3 of class b？（）A Line 33 must be called within a try block.B The exception thrown by method1 in class a is not required to be caught.C The method declared on line 31 must be declared to throw a RuntimeException.D On line 5 of class a， the call to method2 of class b does not need to be placed in a try/catch block.
单选题10. class Nav{ 11. public enum Direction { NORTH， SOUTH， EAST， WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } 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；
单选题1. class Bar { } 1. class Test { 2. Bar doBar（） { 3. Bar b = new Bar（）； 4. return b； 5. } 6. public static void main （String args[]） { 7. Test t = new Test（）； 8. Bar newBar = t.doBar（）； 9. System.out.println（“newBar”）； 10. newBar = new Bar（）； 11. System.out.println（“finishing”）； 12. } 13. } At what point is the Bar object， created on line 3， eligible for garbage collection？（）A After line 8.B After line 10.C After line 4， when doBar（） completes.D After line 11， when main（） completes.