Java中fail-fast和fail-safe的使用

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

public class FailFastExample {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("A");
        list.add("B");
        list.add("C");

        Iterator<String> iterator = list.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
            // 在迭代过程中尝试修改集合
            list.remove("B"); // 这将导致ConcurrentModificationException
        }
    }
}

import java.util.Iterator;
import java.util.concurrent.CopyOnWriteArrayList;

public class FailSafeExample {
    public static void main(String[] args) {
        CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
        list.add("A");
        list.add("B");
        list.add("C");

        Iterator<String> iterator = list.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
            // 在迭代过程中尝试修改集合，不会抛出异常
            list.add("D");
        }
    }
}