Convert from ArrayList<Integer> to Array in java [duplicate]

Question

I should create Thread as ProducerThread and ConsumerThread those execute sequentially and put elements to queue. In this implementation I used ArrayList.

How might I convert an ArrayList object to integer Array in java.

This is my ConsumerThread class.

import java.util.ArrayList;
public class ConsumerThread implements Runnable {
    ArrayList<Integer> queue = new ArrayList<Integer>();

public ConsumerThread(ArrayList<Integer> queue) {
    this.queue = queue;
}

@Override
public void run() {
    synchronized(queue) {
        int value;
        while(true) {
            try {
                queue.wait();
                System.out.println("Consumer Started");
                value = queue.remove(0);
                System.out.println("Consumer thread consumes " + value);
                System.out.println("Elements in Queue = " + queue);
                Thread.sleep(1000);
                queue.notify();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    }

}

This is my ProducerThread class.

import java.util.ArrayList;

public class ProducerThread implements Runnable {
    ArrayList<Integer> queue = new ArrayList<Integer>();
    
    public ProducerThread(ArrayList<Integer> queue) {
        this.queue = queue;
    }

    @Override
    public void run() {
        synchronized(queue) {
            int value = 10;
            while(true) {
                try {
                    queue.notify();
                    System.out.println("Producer Started");
                    System.out.println("Producer adding value = " + value + " to Queue");
                    queue.add(value);
                    value = value + 10;
                    //Thread.sleep(1000);
                    queue.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }

}

This is my main class.

import java.util.ArrayList;

public class ThreadTest {
    public static void main(String[] args) {
        ArrayList<Integer> queue = new ArrayList<Integer>();
        Thread producer = new Thread(new ProducerThread(queue));
        Thread consumer = new Thread(new ConsumerThread(queue));
        
        producer.start();
        consumer.start();
        System.out.println("Starting");
    }
}

Can you be more specific about your requirement. You want to use array instead of arraylist ? — Ashishkumar Singh
– Ashishkumar Singh, Commented Aug 22, 2022 at 6:18
By the way, your Consumer and Producer classes need new names. They are not threads, so putting "Thread" in their name is confusing. "Task" is one commonly used word for a Runnable or Callable. Also, I suggest learning about using the Executors framework and ExecutorService class to run your tasks rather than calling new Thread. — Basil Bourque
– Basil Bourque, Commented Aug 22, 2022 at 7:28

MC Emperor · Accepted Answer · 2022-08-22 07:43:50Z

0

toArray() method convert any ArrayList to Array Objects -> Object[]

ArrayList<Integer> queue = new ArrayList<>();
queue.add(23);
queue.add(6765);
Object[] arrayQueue = queue.toArray();
System.out.println("arrayList = " + queue + "\n arrayNative = ");
Arrays.stream(arrayQueue).forEach(System.out::println);

edited Aug 22, 2022 at 7:43

MC Emperor

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answered Aug 22, 2022 at 6:42

Omar Hussien

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