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Oracle Java SE 8 Programmer II Sample Questions (Q179-Q184):

NEW QUESTION # 179
Given:
class Vehicle {
int vno;
String name;
public Vehicle (int vno, String name) {
this.vno = vno,;
this.name = name;
}
public String toString () {
return vno + ":" + name;
}
}
and this code fragment:
Set<Vehicle> vehicles = new TreeSet <> ();
vehicles.add(new Vehicle (10123, "Ford"));
vehicles.add(new Vehicle (10124, "BMW"));
System.out.println(vehicles);
What is the result?

A. A ClassCastException is thrown at run time.
B. A compilation error occurs.
C. 10123 Ford 10124 BMW
D. 10124 BMW 10123 Ford

Answer: D

NEW QUESTION # 180
Given the code fragment:

Which code fragment, when inserted at line 3, enables the code to print 10:20?

A. int array = new int [2] ;
B. int array [2] ;
C. int [ ] array;
D. int [ ] array = new int [2] ;

Answer: D

NEW QUESTION # 181
Given:
class Vehicle implements Comparable<Vehicle>{
int vno;
String name;
public Vehicle (int vno, String name) {
this.vno = vno,;
this.name = name;
}
public String toString () {
return vno + ":" + name;
}
public int compareTo(Vehicle o) {
return this.name.compareTo(o.name);
}
and this code fragment:
Set<Vehicle> vehicles = new TreeSet <> ();
vehicles.add(new Vehicle (10123, "Ford"));
vehicles.add(new Vehicle (10124, "BMW"));
System.out.println(vehicles);
What is the result?

A. A ClassCastException is thrown at run time.
B. [10123:Ford, 10124:BMW]
C. [10124:BMW, 10123:Ford]
D. A compilation error occurs.

Answer: B

NEW QUESTION # 182
Given the code fragment:
Stream<Path> files = Files.walk(Paths.get(System.getProperty("user.home"))); files.forEach (fName -> {//line n1 try { Path aPath = fName.toAbsolutePath();//line n2 System.out.println(fName + ":"
+ Files.readAttributes(aPath, Basic.File.Attributes.class).creationTime ());
} catch (IOException ex) {
ex.printStackTrace();
});
What is the result?

A. A compilation error occurs at line n1.
B. All files and directories under the home directory are listed along with their attributes.
C. A compilation error occurs at line n2.
D. The files in the home directory are listed along with their attributes.

Answer: B

NEW QUESTION # 183
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) throws 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. A compilation error occurs at line n1.
B. The program prints:Run RunnerCall Caller : nullAnd the program does not terminate.
C. An Execution is thrown at run time.
D. The program terminates after printing:Run RunnerCall Caller : Run

Answer: C

NEW QUESTION # 184
......

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Fred Lee Fred Lee

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