问在多线程进程中访问单个集合

EN

package my.package.concurrency_practice;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class CollectionsAndThreads {
    private List<Integer> list = new ArrayList<>();

    public CollectionsAndThreads() {
        for (int i=0; i < 10_000_000; i++) {
            list.add(i);
        }
        System.out.println("Initialized with one million entries.");
    }

    public void addEntries() {

        System.out.print("Adding a million more entries ... ");
            for (int i = 10_000_001; i < 20_000_000; i++) {
                list.add(i);
            }
        System.out.println("Done.");
    }

    public void interateEntries() {
        Iterator iter = list.iterator();

        System.out.print("Interating through entries ... ");

            while (iter.hasNext()) {
                iter.next();
            }
        System.out.println("Done.");
    }

    public List<Integer> getList() {
        return list;
    }

    public static void main(String[] args) {
        CollectionsAndThreads test = new CollectionsAndThreads();

        System.out.println(test.getList().size());

        Thread thread1 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("Inside thread: " + this.toString());
                test.addEntries();
            }
        });

        Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("Inside thread: " + this.toString());
                test.interateEntries();
            }
        });

        thread1.start();
        thread2.start();
    }
}