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Guava - Bimap Interface
A BiMap is a special kind of map which maintains an inverse view of the map while ensuring that no duplicate values are present in the map and a value can be used safely to get the key back.
Interface Declaration
Following is the declaration for com.google.common.collect.Bimap<K,V> interface −
@GwtCompatible public interface BiMap<K,V> extends Map<K,V>
Interface Methods
| Sr.No | Method & Description |
|---|---|
| 1 |
V forcePut(K key, V value) An alternate form of 'put' that silently removes any existing entry with the value before proceeding with the put(K, V) operation. |
| 2 |
BiMap<V,K> inverse() Returns the inverse view of this bimap, which maps each of this bimap's values to its associated key. |
| 3 | V put(K key, V value) Associates the specified value with the specified key in this map (optional operation). |
| 4 |
void putAll(Map<? extends K,? extends V> map) Copies all of the mappings from the specified map to this map (optional operation). |
| 5 | Set<V> values() Returns a Collection view of the values contained in this map. |
Methods Inherited
This class inherits methods from the following interface −
- java.util.Map
Example of BiMap
Create the following java program using any editor of your choice in say C:/> Guava.
GuavaTester.java
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
public class GuavaTester {
public static void main(String args[]) {
BiMap<Integer, String> empIDNameMap = HashBiMap.create();
empIDNameMap.put(new Integer(101), "Mahesh");
empIDNameMap.put(new Integer(102), "Sohan");
empIDNameMap.put(new Integer(103), "Ramesh");
//Emp Id of Employee "Mahesh"
System.out.println(empIDNameMap.inverse().get("Mahesh"));
}
}
Verify the Result
Compile the class using javac compiler as follows −
C:\Guava>javac GuavaTester.java
Now run the GuavaTester to see the result.
C:\Guava>java GuavaTester
See the result.
101
