单项选择题

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？（）

A. Line 4 of class Target can be changed to return i++；
B. Line 2 of class Target can be changed to private int i = 1；
C. Line 3 of class Target can be changed to private int addOne（） {
D. Line 2 of class Target can be changed to private Integer i = 0；

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单项选择题

package test；
class Target {
public String name = “hello”；
}
What can directly access and change the value of the variable name？（）

A. any class
B. only the Target class
C. any class in the test package
D. any class that extends Target

多项选择题

Which two are true？（）

A. An encapsulated， public class promotes re-use.
B. Classes that share the same interface are always tightly encapsulated.
C. An encapsulated class allows subclasses to overload methods， but does NOT allow overriding methods.
D. An encapsulated class allows a programmer to change an implementation without affecting outside code.

单项选择题

foo and bar are public references available to many other threads. foo refers to a Thread and bar is an Object. The thread foo is currently executing bar.wait（）. From another thread， which statement is the most reliable way to ensue that foo will stop executing wait（）？

A. foo.notify（）；
B. bar.notify（）；
C. foo.notifyAll（）；
D. Thread.notify（）；
E. bar.notiFYAll（）；
F. Object.notify（）；