Author Question: Analyze the following code.// Test.java: Define threads using the Thread classimport ... (Read 63 times)

tnt_battle · **on:** May 6, 2020

Analyze the following code.

// Test.java: Define threads using the Thread class
import java.util.*;

public class Test {
private Stack stack = new Stack();
private int i = 0;

/** Main method */
public static void main(String[] args) {

new Test();

}

public Test() {

// Start threads

new Producer().start();

new Consumer().start();

}

class Producer extends Thread {

public void run() {

while (true) {

System.out.println("Producer: put " + i);

stack.push(new Integer(i++));

synchronized (stack) {

notifyAll();

}

}

class Consumer extends Thread {

public void run() {

while (true) {

synchronized (stack) {

try {

while (stack.isEmpty())

stack.wait();

System.out.println("Consumer: get " + stack.pop());

}

catch (InterruptedException ex) {

ex.printStackTrace();

}

}
}
◦ The program has a compilation error on the notifyAll() method in the Producer class because it is not invoked from the stack object.
◦ The program will throw an exception because the notifyAll() method in the Producer class is not invoked from the stack object.
◦ The program has a logic error because the lock obtained by the synchronized block for notifyAll in the Producer class is stack and it should be this (i.e., synchronized (this) { notifyAll(); }).
◦ The program creates two threads: one to add data to the stack and the other to get data from the stack.

kalskdjl1212 · **Reply #1 on:** May 6, 2020

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