11. rbo = new ReallyBigObject();  12. // more code here  13.

题目
单选题
11. rbo = new ReallyBigObject();  12. // more code here  13. rbo = null;  14. /* insert code here */  Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo?()
A

 System.gc();

B

 Runtime.gc();

C

 System.freeMemory();

D

 Runtime.getRuntime().growHeap();

E

 Runtime.getRuntime().freeMemory();

如果没有搜索结果或未解决您的问题,请直接 联系老师 获取答案。
相似问题和答案

第1题:

class One {  void foo() {}  }  class Two extends One {   //insert method here  }  Which three methods, inserted individually at line 14, will correctly complete class Two?()

  • A、 int foo() { /* more code here */ }
  • B、 void foo() { /* more code here */ }
  • C、 public void foo() { /* more code here */ }
  • D、 private void foo() { /* more code here */ }
  • E、 protected void foo() { /* more code here */ }

正确答案:B,C,E

第2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();

正确答案:B

第3题:

11.rbo = new ReallyBigObject();12.//more code here13.rbo = null;14./*insert code here*/Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the objectrbo?()

A.System.gc();

B.Runtime.gc();

C.System.freeMemory();

D.Runtime.getRuntime().growHeap();

E.Runtime.getRuntime().freeMemory();


参考答案:A

第4题:

11. public interface Status {  12. /* insert code here */ int MY_VALUE = 10;  13. }  Which three are valid on line 12?()

  • A、 final
  • B、 static
  • C、 native
  • D、 public
  • E、 private
  • F、 abstract
  • G、 protected

正确答案:A,B,D

第5题:

11. public class Counter {  12. public static void main(String[] args) {  13. int numArgs = /* insert code here */;  14. }  15. }  and the command line: java Counter one fred 42 Which code, inserted at line 13, captures the number of arguments passed into the program?() 

  • A、 args.count
  • B、 args.length
  • C、 args.count()
  • D、 args.length()
  • E、 args.getLength()

正确答案:B

第6题:

11. List list = // more code here  12. Collections.sort(list, new MyComparator());  Which code will sort this list in the opposite order of the sort in line 12?() 

  • A、 Collections.reverseSort(list, new MyComparator());
  • B、 Collections.sort(list, new MyComparator()); list.reverse();
  • C、 Collections.sort(list, new InverseComparator( new MyComparator()));
  • D、 Collections.sort(list, Collections.reverseOrder( new MyComparator()));

正确答案:D

第7题:

现有:  1.  class Propeller2  {  2.   pulolic static void main (String[]args)//add code here?      3.    {  new Propeller2().topGo();  }      4.  5.void topGo()  //add code here?      6.    {   middleGo();  }      7.  8.void middleGo()  //add code here?  9. {   go();  System.out.println ("late middle");  }    void go()  //add code here?      12.    {throw new Exception();  }      13.  }  为使代码通过编译,需要在哪一行加入声明throws Exception?()     

  • A、只在第11行
  • B、在第8行和第11行
  • C、在第5行、第8行和第11行
  • D、在第2行、第5行、第8行和第11行

正确答案:D

第8题:

Given:Which three methods, inserted individually at line 14, will correctly complete class Two?()

A.int foo() { /* more code here */ }

B.void foo() { /* more code here */ }

C.public void foo() { /* more code here */ }

D.private void foo() { /* more code here */ }

E.protected void foo() { /* more code here */ }


参考答案:B, C, E

第9题:

12. Date date = new Date();  13. df.setLocale(Locale.ITALY);  14. String s = df.format(date);  The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14, 2000?() 

  • A、 The value of s is 14-dic-2004.
  • B、 The value of s is Dec 14, 2000.
  • C、 An exception is thrown at runtime.
  • D、 Compilation fails because of an error in line 13.

正确答案:D

第10题:

10. interface Foo {}  11. class Alpha implements Foo {}  12. class Beta extends Alpha {}  13. class Delta extends Beta {  14. public static void main( String[] args) {  15. Beta x = new Beta();  16. // insert code here  17. }  18. }  Which code, inserted at line 16, will cause a java.lang.ClassCastException?() 

  • A、 Alpha a = x;
  • B、 Foo f= (Delta)x;
  • C、 Foo f= (Alpha)x;
  • D、 Beta b = (Beta)(Alpha)x;

正确答案:B

更多相关问题