Answer to Question #242474 in Java | JSP | JSF for Jerry

Question

Write a simulation java program for the fruit market. The farmer will be able to

produce different types of fruits (apple, orange, grape, and watermelon), and

put them in the market to sell. The market has limited capacity and farmers

have to stand in a queue if the capacity is exceeded to sell their fruits.

Consumers can come to the market any time and purchase their desired fruits;

and if the fruits they want to buy runs out, they are willing to wait until the

supply of that kind is ready. (Hint: implementing this market will encounter

the producer and consumer problem, and it probably needs multiple buffers

for different kinds of fruits).

Answer 1

import java.util.ArrayList;

class Market {
	private ArrayList<String> fruits = new ArrayList<>();
	private int fruitsNumber;
	public Market(int fruitsNumber) {
		if (fruitsNumber > 0) {
			this.fruitsNumber = fruitsNumber;
		} else {
			throw new IllegalArgumentException("This argument is not valid");
		}
	}
	private synchronized boolean isFull() {
		return fruits.size() == this.fruitsNumber;
	}
	private synchronized boolean isEmpty() {
		return fruits.isEmpty();
	}
       public synchronized void farmer(String fruit) {
		if (isFull()) {
			System.out
					.println("We can not accept more fruites at the moment !!");
			try {
				wait();
			} catch (InterruptedException e) {
				System.out.println("Interruption");
			}
		}
		fruits.add(fruit);
		System.out.printf("fruit : %s is added !!!%n", fruit);
	}


	public synchronized String consumer() {
		if (isEmpty()) {
			System.out.println("we don't have any goods yet");
			try {
				wait();
			} catch (InterruptedException e) {
				System.out.println("interruption occure !!!");
			}
		}
		String currentFruitRecusted = fruits.remove(0);
		notifyAll();
		return currentFruitRecusted;
	}
}
public class Main {
	public static void main(String[] args) {
		Market superMarket = new Market(10);
	}
}