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 objectrbo?()A、System.gc();B、Ru

题目

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 objectrbo?()

  • A、System.gc();
  • B、Runtime.gc();
  • C、System.freeMemory();
  • D、Runtime.getRuntime().growHeap();
  • E、Runtime.getRuntime().freeMemory();
参考答案和解析
正确答案:A
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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:

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:

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

第5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6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7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;

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:

11. double input = 314159.26;  12. NumberFormat nf= NumberFormat.getInstance(Locale.ITALIAN);  13. String b;  14. //insert code here  Which code, inserted at line 14, sets the value of b to 3 14.159,26?() 

  • A、 b = nf.parse( input);
  • B、 b = nf.format( input);
  • C、 b = nf.equals( input);
  • D、 b = nf.parseObject( input);

正确答案:B

第10题:

14. DateFormat df;  15. Date date = new Date();  16. //insert code here  17. String s = df.format( date);  Which two,inserted independently at line 16, allow the code to compile?()

  • A、 df= new DateFormat();
  • B、 df= Date.getFormatter();
  • C、 df= date.getFormatter();
  • D、 df= date.getDateFormatter();
  • E、df = DateFormat.getDateInstance();
  • F、 df= DateFormat.getInstance();

正确答案:E,F

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