Guava – bimap

bimap即双向map，是一个既保留其值的唯一性又保留其键的唯一性的map。BiMaps支持 inverse view ，它是另一个bimap，包含与这个bimap相同的条目，但是键和值是相反的。

声明 : com.google.common.collect.Bimap < K, V > 接口的声明如下。

@GwtCompatiblepublic interface BiMap< **K, V** >extends Map< **K, V** >

以下是Guava BiMap接口提供的一些方法：

返回值和异常：

以下是Guava BiMap接口的实现：

// Java code to show implementation for// Guava BiMap interfaceimport com.google.common.collect.BiMap;import com.google.common.collect.HashBiMap;  class GFG {      // Driver method    public static void main(String args[])    {          // Creating a BiMap with first field as        // an Integer and second field as String        // stuRollMap is name of BiMap        // i.e, the first field of BiMap stores        // the Roll no. of student and second        // field stores the name of Student        BiMap<Integer, String> stuRollMap = HashBiMap.create();          stuRollMap.put(new Integer(2), "Sahil");        stuRollMap.put(new Integer(6), "Dhiman");        stuRollMap.put(new Integer(9), "Shubham");        stuRollMap.put(new Integer(15), "Abhishek");          // To display Roll no. of student "Dhiman"        System.out.println(stuRollMap.inverse().get("Dhiman"));          // To display Roll no. of student "Shubham"        System.out.println(stuRollMap.inverse().get("Shubham"));    }}

输出:

69