Given the code fragment:
public void recDelete (String dirName) throws IOException {
File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) {
if (!aFile.isDirectory ()) {
if (aFile.getName ().endsWith (".class"))
aFile.delete ();
}
}
}
}
Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the recDelete () method when it is invoked.
What is the result?

• A. The method deletes the .class files of the Projects directory only.
• B. The method throws an IOException.
• C. The method executes and does not make any changes to the Projects directory.
• D. The method deletes all the .class files in the Projects directory and its subdirectories.

Given the content of the employee.txt file:
Every worker is a master.
Given that the employee.txt file is accessible and the file allemp.txt does NOT exist, and the code fragment:

What is the result?

• A. Exception 2
• B. Exception 1
• C. allemp.txt is created and the content of employee.txt is copied to it.
• D. The program executes, does NOT affect the system, and produces NO output.

Given:
class Worker extends Thread {
CyclicBarrier cb;
public Worker(CyclicBarrier cb) { this.cb = cb; }
public void run () {
try {
cb.await();
System.out.println("Worker...");
} catch (Exception ex) { }
}
}
class Master implements Runnable { //line n1
public void run () {
System.out.println("Master...");
}
}
and the code fragment:
Master master = new Master();
//line n2
Worker worker = new Worker(cb);
worker.start();
You have been asked to ensure that the run methods of both the Worker and Master classes are executed.
Which modification meets the requirement?

• A. At line n2, insert CyclicBarrier cb = new CyclicBarrier(master);
• B. At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);
• C. Replace line n1 with class Master extends Thread {
• D. At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master);

Given the definition of the Vehicle class:
Class Vehhicle {
int distance;//line n1
Vehicle (int x) {
this distance = x;
}
public void increSpeed(int time) {//line n2
int timeTravel = time;//line n3
class Car {
int value = 0;
public void speed () {
value = distance /timeTravel;
System.out.println ("Velocity with new speed"+value+"kmph");
}
}
new Car().speed();
}
}
and this code fragment:
Vehicle v = new Vehicle (100);
v.increSpeed(60);
What is the result?

• A. A compilation error occurs at line n1.
• B. Velocity with new speed 1 kmph
• C. A compilation error occurs at line n2.
• D. A compilation error occurs at line n3.