java.util.Vector - 替代品

import java.util.ArrayList;

public class Main {
    public static void main(String[] args) {
        ArrayList<String> list = new ArrayList<>();
        list.add("Java");
        list.add("C++");
        list.add("Python");
        System.out.println(list);
    }
}

import java.util.Collections;

public class Main {
    public static void main(String[] args) {
        List<String> list = Collections.synchronizedList(new ArrayList<>());
        list.add("Java");
        list.add("C++");
        list.add("Python");
        System.out.println(list);
    }
}