bimap – California Sunshine

今天介绍一个BiMap的小例子。

import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
 
 
public class TryBiMap {
 
    public static void main(String[] args) {
        BiMap<String, String> aBiMap = HashBiMap.<String, String>create();
 
        aBiMap.put("abc", "def");
        aBiMap.put("defe", "abcd");
 
        System.out.println(aBiMap); // output: {abc=def, defe=abcd}
        System.out.println(aBiMap.get("abc")); // output: def
 
        // this line will throw a runtime exception
        // because there is "defe":"abcd" already. This record impacts BiMap.inverse.
        // aBiMap.put("abc", "abcd");
 
        // But we can use BiMap.forcePut to put the record of "abc":"abcd"
        // And the record "defe":"abcd" will be erased.
        aBiMap.forcePut("abc", "abcd");
 
        // Use BiMap.inverse() to get a inversed bimap.
        aBiMap = aBiMap.inverse();
 
        System.out.println(aBiMap); // output: {abcd=abc}
        System.out.println(aBiMap.get("abcd")); // output: abc
    }
}

import com.google.common.collect.BiMap;

import com.google.common.collect.HashBiMap;

public class TryBiMap {

public static void main(String[] args) {

BiMap<String, String> aBiMap = HashBiMap.<String, String>create();

aBiMap.put("abc", "def");

aBiMap.put("defe", "abcd");

System.out.println(aBiMap); // output: {abc=def, defe=abcd}

System.out.println(aBiMap.get("abc")); // output: def

// this line will throw a runtime exception

// because there is "defe":"abcd" already. This record impacts BiMap.inverse.

// aBiMap.put("abc", "abcd");

// But we can use BiMap.forcePut to put the record of "abc":"abcd"

// And the record "defe":"abcd" will be erased.

aBiMap.forcePut("abc", "abcd");

// Use BiMap.inverse() to get a inversed bimap.

aBiMap = aBiMap.inverse();

System.out.println(aBiMap); // output: {abcd=abc}

System.out.println(aBiMap.get("abcd")); // output: abc

}

Tag: bimap

Google Guava之BiMap