MapHeavenV1.java Source code

Introduction

Here is the source code for MapHeavenV1.java

Source

import java.util.Map;
import java.util.Date;
import java.util.HashMap;

import org.apache.commons.collections.map.LazyMap;
import org.apache.commons.collections.FactoryUtils;
import org.apache.commons.collections.map.IdentityMap;
import org.apache.commons.collections.map.CaseInsensitiveMap;

public class MapHeavenV1 {
    public static void main(String args[]) {
        MapHeavenV1 instance = new MapHeavenV1();
        instance.createMaps();
        instance.testMaps();
    }

    private void testMaps() {
        cIMap.put("key1", "value1");
        cIMap.put("key2", "value2");
        cIMap.put("KeY1", "value3");

        System.err.println("Value of key1: " + cIMap.get("key1")); // value3 because it is case insensitive

        Integer identRef = new Integer(1);
        Integer identRef2 = new Integer(1);
        identMap.put(identRef, "value1");
        identMap.put(identRef2, "value3");

        System.err.println("Value of identRef2: " + identMap.get(identRef2)); // value 3 even though both identRef and identRef2 are equal

        System.err.println(lazyMap); // only creates elements when they are accessed
        lazyMap.get("EmptyBuffer");
        System.err.println(lazyMap);
    }

    private void createMaps() {
        cIMap = new CaseInsensitiveMap();
        identMap = new IdentityMap();
        lazyMap = LazyMap.decorate(new HashMap(), FactoryUtils.instantiateFactory(StringBuffer.class));
    }

    private CaseInsensitiveMap cIMap;
    private IdentityMap identMap;
    private Map lazyMap;
}