[Java] LRUMap Example

1. LRUMap Example

Download: apache commons collections

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package javautility; import java.io.IOException; import java.util.Map; import org.apache.commons.collections4.map.LRUMap; public class JavaUtility { static void testLRUMapExplicit() { Map<String,String> map = new LRUMap(2); map.put("3","C"); map.put("2","B"); map.put("1","A"); for(Map.Entry<String,String> m : map.entrySet() ) { //don't use keySet() System.out.println(m.getKey() + "," + m.getValue()); } } static void testLRUMapImplicit() { LRUMap map = new LRUMap(2); map.put("3","C"); map.put("2","B"); map.put("1","A"); for( Object m : map.entrySet() ) { Map.Entry<String,String> e = (Map.Entry<String,String>)m; System.out.println(e.getKey() + "," + e.getValue()); } } public static void main(String[] args) throws IOException { testLRUMapExplicit(); System.out.println("----------"); testLRUMapImplicit(); } }

Result:

2,B
1,A
----------
2,B
1,A