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org.apache.commons.collections4.map.LazyMap Example
What is org.apache.commons.collections4.map.LazyMap class? How to use org.apache.commons.collections4.map.LazyMap class?
✍: FYIcenter.com
org.apache.commons.collections4.map.LazyMap class is a Java class
offered in commons-collections4.jar that
wraps a regular map into a special map with
a mechanism to automatically generate any missing entries in the map.
A LazyMap object contains a Factory object that will be used to automatically generate the value of any key that does not exist in the LazyMap object, when the get() method is called.
Here is a simple example of using org.apache.commons.collections4.map.LazyMap class:
// Copyright (c) 2016-2018 FYIcenter.com // Supports commons-collections4-4.2 // Supports commons-collections4-4.1 import java.util.Date; import java.util.Map; import java.util.HashMap; import org.apache.commons.collections4.Factory; import org.apache.commons.collections4.map.LazyMap; // Example of using the LazyMap class public class LazyMapExample { public static void main(String[] args) throws Exception { // Create a "factory" with anonymous class Factory<Date> factory = new Factory<Date>() { public Date create() { return new Date(); } }; // Create a regular "map" Map<String, Date> map = new HashMap<String, Date>(); // Wrap the regular "map" into a "lazy" map Map<String, Date> lazy = LazyMap.lazyMap(map, factory); // Generate values on the fly System.out.println(lazy.get("Before")); Thread.sleep(1000); System.out.println(lazy.get("After")); // Loop though the map for (String key : lazy.keySet()) { System.out.println(key + " = " + lazy.get(key)); } } }
You can compile and run the above example in a command window as shown below:
C:\fyicenter>\fyicenter\jdk-1.8.0\bin\javac -cp C:\fyicenter\commons-collections4-4.2\commons-collections4-4.2.jar LazyMapExample.java C:\fyicenter>\fyicenter\jdk-1.8.0\bin\java -cp .;C:\fyicenter\commons-collections4-4.2\commons-collections4-4.2.jar LazyMapExample Sat Oct 6 23:08:38 EDT 2018 Sat Oct 6 23:08:40 EDT 2018 Before = Sat Oct 6 23:08:38 EDT 2018 After = Sat Oct 6 23:08:40 EDT 2018
⇒ org.apache.commons.collections4.queue.CircularFifoQueue Example
⇐ Class Packages in commons-collections4-4.1.jar
2017-05-20, 2816🔥, 0💬
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