使用3个线程将元素添加到5个ArrayList中:数组大小的总和总是不同的

import java.util.ArrayList;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class ArrayListThreadExample {
    private static ArrayList<Integer> arrayList1 = new ArrayList<>();
    private static ArrayList<Integer> arrayList2 = new ArrayList<>();
    private static ArrayList<Integer> arrayList3 = new ArrayList<>();
    private static ArrayList<Integer> arrayList4 = new ArrayList<>();
    private static ArrayList<Integer> arrayList5 = new ArrayList<>();
    private static Lock lock = new ReentrantLock();

    public static void main(String[] args) {
        Thread thread1 = new Thread(() -> {
            for (int i = 0; i < 10; i++) {
                lock.lock();
                arrayList1.add(i);
                lock.unlock();
            }
        });

        Thread thread2 = new Thread(() -> {
            for (int i = 10; i < 20; i++) {
                lock.lock();
                arrayList2.add(i);
                lock.unlock();
            }
        });

        Thread thread3 = new Thread(() -> {
            for (int i = 20; i < 30; i++) {
                lock.lock();
                arrayList3.add(i);
                lock.unlock();
            }
        });

        Thread thread4 = new Thread(() -> {
            for (int i = 30; i < 40; i++) {
                lock.lock();
                arrayList4.add(i);
                lock.unlock();
            }
        });

        Thread thread5 = new Thread(() -> {
            for (int i = 40; i < 50; i++) {
                lock.lock();
                arrayList5.add(i);
                lock.unlock();
            }
        });

        thread1.start();
        thread2.start();
        thread3.start();
        thread4.start();
        thread5.start();

        try {
            thread1.join();
            thread2.join();
            thread3.join();
            thread4.join();
            thread5.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("ArrayList1: " + arrayList1);
        System.out.println("ArrayList2: " + arrayList2);
        System.out.println("ArrayList3: " + arrayList3);
        System.out.println("ArrayList4: " + arrayList4);
        System.out.println("ArrayList5: " + arrayList5);
    }
}