【支持双向绑定的Map之BiMap】 1.forcePut 2.inverse

package org.example.testBiMap;

import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.Maps;

public class Main {

    public static void main(String[] args) {
        BiMap<Integer, String> biMap = Maps.synchronizedBiMap(HashBiMap.create());
        biMap.put(1, "a");

        System.out.println(biMap.get(1));

        BiMap<String, Integer> inverse = biMap.inverse();
        System.out.println(inverse.get("a"));
        System.out.println(inverse.get("b"));

        // 必须要求value唯一,之前的已经存在过
//        biMap.put(12, "a");
        biMap.forcePut(12, "a");

        System.out.println(biMap.get(12));
        System.out.println(biMap.inverse().get("a"));
    }
}

/*
a
1
null
a
12
 */

理解：我觉得还是用forcePut比较好。