几个线程安全的类

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package it_06;

import java.util.*;

public class Demo11 {
    public static void main(String[] args) {
        StringBuffer sb =new StringBuffer();
        Vector<String> v =new Vector<>();
        Hashtable<String,String> ht = new Hashtable<>();

        List<String> list = Collections.synchronizedList(new ArrayList<String>());
        Map<String, String> map = Collections.synchronizedMap(new HashMap<String, String>());

    }
}