你可能感興趣的試題

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 programmer is designing a class to encapsulate the information about an inventory item. A JavaBeans component is needed to do this. The Inventoryltem class has private instance variables to store the item information： 
10. private int itemId； 
11. private String name； 
12. private String description； 
Which method signature follows the JavaBeans naming standards for modifying the itemld instance variable？（）