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NO.1 Given the code fragments:
class Caller implements Callable<String> {
String str;
public Caller (String s) {this.str=s;}
public String call()throws Exception { return str.concat ("Caller");}
}
class Runner implements Runnable {
String str;
public Runner (String s) {this.str=s;}
public void run () { System.out.println (str.concat ("Runner"));}
}
and
public static void main (String[] args) InterruptedException, ExecutionException {
ExecutorService es = Executors.newFixedThreadPool(2);
Future f1 = es.submit (new Caller ("Call"));
Future f2 = es.submit (new Runner ("Run"));
String str1 = (String) f1.get();
String str2 = (String) f2.get();//line n1
System.out.println(str1+ ":" + str2);
}
What is the result?
A. An Execution is thrown at run time.
B. The program terminates after printing:
Run Runner
Call Caller : Run
C. A compilation error occurs at line n1.
D. The program prints:
Run Runner
Call Caller : null
And the program does not terminate.
Answer: D

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NO.2 Which three statements are benefits of encapsulation?
A. Prevents code from causing exceptions
B. Enables multiple instances of the same class to be created safely
C. Enables the class implementation to protect its invariants
D. Allows a class implementation to change without changing t he clients
E. Protects confidential data from leaking out of the objects
F. Permits classes to be combined into the same package
Answer: C,D,E

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