1. class A implements Runnable ( 2. int i; 3. public void run ( ) ( 4. try ( 5. thread.sleep(5000); 6. i= 10; 7. ) catch(InterruptedException e) {} 8. ) 9. ) 10. 11. public class Test { 12. public static void main (string args[]) ( 13. try ( 14. A a = new A ( ); 15. Thread t = new Thread (a); 16. t.start( ); 17. 18. int j= a.i; 19. 20. ) catch (Exception e) {} 21. ) 22. } Which statement al line 17 will ensure that j=10 at line 19?()
第1题:
下面程序输出的结果为( )。 #inClUde”iostream.h” Class A {public: A(){cout<<“CLASS A”<<endl;} ~A()<)}; class B:public A {public: B(){cout<<”CLASSB”<<endl;} ~B(){}}; void main() {A*p; p=new B; B *q; q=new B;}
A.CLASS A CLASS B
B.CLASS A CLASS B CLASS B
C.CLASS A ClASS B
D.CLASS A CLASS B CLASS A CLASS B CLASS B CLASS B
第2题:
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?()
第3题:
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?()
第4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?()
第5题:
现自: 1. interface Color { } 2. interface Weight { } 3. //insert code here 和以下足六个声明: class Boat extends Color, extends Weight { } class Boat extends Color and Weight { } class Boat extends Color, Weight { } class Boat implements Color, implements Weight { } class Boat implements Color and Weight { } class Boat implements Color, Weight { } 分别插入到第3行,有多少行可以编译? ()
第6题:
1. public class returnIt ( 2. returnType methodA(byte x, double y) ( 3. return (short) x/y * 2; 4. ) 5. ) What is the valid returnType for methodA in line 2?()
第7题:
doX();
X.doX();
x.X.doX();
x.X myX = new x.X(); myX.doX();
第8题:
process(bytes);
BitUtils.process(bytes);
util.BitUtils.process(bytes);
SomeApp cannot use methods in BitUtils.
import util.BitUtils.*; process(bytes);
第9题:
0
1
2
3
第10题:
static class InnerOne { public double methoda() { return d1; } }
static class InnerOne { static double methoda() { return d1; } }
private class InnerOne { public double methoda() { return d1; } }
protected class InnerOne { static double methoda() { return d1; } }
public abstract class InnerOne { public abstract double methoda(); }
第11题:
Class A
Compilation fails.
An exception is thrown at line 2.
An exception is thrown at line 6.
The code executes with no output.
第12题:
400
360
200
180
160
第13题:
An engineer is preparing an implementation plan in which the configuration needs to influence BGP‘s choice of best path.Which of the following is least likely to be used by the configuration in this imple mentation plan?()
A. Weight
B. Origin code
C. AS_Path
D. Local_Pref
第14题:
1. public interface A { 2. public void doSomething(String thing); 3. } 1. public class AImpl implements A { 2. public void doSomething(String msg) { } 3. } 1. public class B { 2. public A doit() { 3. // more code here 4. } 5. 6. public String execute() { 7. // more code here 8. } 9. } 1. public class C extends B { 2. public AImpl doit() { 3. // more code here 4. } 5. 6. public Object execute() { 7. // more code here 8. } 9. } Which statement is true about the classes and interfaces in the exhibit?()
第15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?()
第16题:
1. public class Exception Test { 2. class TestException extends Exception {} 3. public void runTest() throws TestException {} 4. public void test() /* Point X */ { 5. runTest(); 6. } 7. } At Point X on line 4, which code is necessary to make the code compile?()
第17题:
An engineer is preparing an implementation plan in which the configuration needs to influence BGP's choice of best path. Which of the following is least likely to be used by the configuration in this imple mentation plan?()
第18题:
1. public class enclosingone ( 2. public class insideone{} 3. ) 4. public class inertest( 5. public static void main (string[]args)( 6. enclosingone eo= new enclosingone (); 7. //insert code here 8. ) 9. ) Which statement at line 7 constructs an instance of the inner class?()
第19题:
InsideOnew ei= eo.new InsideOn();
Eo.InsideOne ei = eo.new InsideOne();
InsideOne ei = EnclosingOne.new InsideOne();
EnclosingOne.InsideOne ei = eo.new InsideOne();
第20题:
process(bytes);
BitUtils.process(bytes);
app.BitUtils.process(bytes);
util.BitUtils.process(bytes);
import util.BitUtils. *; process(bytes);
SomeApp cannot use the process method in BitUtils.
第21题:
Line 33 must be called within a try block.
The exception thrown by method1 in class a is not required to be caught.
The method declared on line 31 must be declared to throw a RuntimeException.
On line 5 of class a, the call to method2 of class b does not need to be placed in a try/catch block.
第22题:
The application will crash.
The code on line 29 will be executed.
The code on line 5 of class A will execute.
The code on line 5 of class B will execute.
The exception will be propagated back to line 27.
第23题:
No code is necessary.
throws Exception
catch ( Exception e )
throws RuntimeException
catch ( TestException e)
第24题:
import utils.*;
static import utils.*;
import utils.Repetition.*;
static import utils.Repetition. *;
import utils.Repetition.twice();
import static utils.Repetition.twice;
static import utils.Repetition.twice;