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NO.1 Given:
Class A { }
Class B { }
Interface X { }
Interface Y { }
Which two definitions of class C are valid?
A. Class C implements X, Y extends B { }
B. Class C extends A, B { }
C. Class C implements Y extends B { }
D. Class C extends A implements X { }
E. Class C extends B implements X, Y { }
Answer: D,E

1z0-809 Exam PDF   1z0-809 Practice Exam   
Explanation:
extends is for extending a class.
implements is for implementing an interface. Java allows for a class to implement many interfaces.

NO.2 Given the code fragment:
class CallerThread implements Callable<String> {
String str;
public CallerThread(String s) {this.str=s;}
public String call() throws Exception {
return str.concat("Call");
}
}
and
public static void main (String[] args) throws InterruptedException, ExecutionException
{
ExecutorService es = Executors.newFixedThreadPool(4); //line n1
Future f1 = es.submit (newCallerThread("Call"));
String str = f1.get().toString();
System.out.println(str);
}
Which statement is true?
A. An ExecutionException is thrown at run time.
B. A compilation error occurs at line n1.
C. The program prints Call Call and does not terminate.
D. The program prints Call Call and terminates.
Answer: C

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