多项选择题

Which two demonstrate encapsulation of data？（）

A. Member data have no access modifiers.
B. Member data can be modified directly.
C. The access modifier for methods is protected.
D. The access modifier to member data is private.
E. Methods provide for access and modification of data.

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单项选择题

public class Test {
public static void main （String [] args） {
string foo = “blue”；
string bar = foo；
foo = “green”；
System.out.printIn（bar）；
}
}
What is the result？（）

A. An exception is thrown.
B. The code will not compile.
C. The program prints “null”
D. The program prints “blue”
E. The program prints “green”

单项选择题

2. public class Foo implements Runnable （
3. public void run （Thread t） {
4. system.out.printIn（“Running.”）；
5. }
6. public static void main （String[] args） {
7. new thread （new Foo（））.start（）；
8. ）
9. ）
What is the result？（）

A. An exception is thrown.
B. The program exists without printing anything.
C. An error at line 1 causes compilation to fail.
D. An error at line 6 causes the compilation to fail.
E. “Running” is printed and the program exits.

多项选择题

Which two can directly cause a thread to stop executing？（）

A. Exiting from a synchronized block.
B. Calling the wait method on an object.
C. Calling the notify method on an object.
D. Calling the notifyAll method on an object.
E. Calling the setPriority method on a thread object.