tl  tr
  Home | Tutorials | Articles | Videos | Products | Tools | Search
Open Source | Tag Cloud | Follow Us | Bookmark | Contact   
 
 Tools and Libs > Google Guava > Collections > Map values Transform

Map values Transform 

Google Guava is a java library with lot of utilities and reusable components. This requires the library guava-10.0.jar to be in classpath. The following example shows using Maps.transformValues() API. It transforms the given source map to target map by applying Function callback.

File Name  :  
com/bethecoder/tutorials/guava/collection_tests/MapValueTransformTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.guava.collection_tests;

import java.util.Map;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;

public class MapValueTransformTest {

  /**
   @param args
   */
  public static void main(String[] args) {
    Map<String, Integer> immutableMap = ImmutableMap.of("ONE"1"TWO"2"THREE"3);
    System.out.println(immutableMap);
    
    Map<String, String> transMap = 
      Maps.transformValues(immutableMap, new Function<Integer, String>() {

        @Override
        public String apply(Integer input) {
          return "BTC-" + input; //new value in transformed map
        }
    });
    
    System.out.println(transMap);
  }
}
   

It gives the following output,
{ONE=1, TWO=2, THREE=3}
{ONE=BTC-1, TWO=BTC-2, THREE=BTC-3}


                    Print

   



Books Recommendation

 
 
bl  br