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What are the examples of Proxy design pattern in JDK?

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Pragya Keshap answered on February 10, 2023 Popularity 3/10 Helpfulness 1/10

answer What are the examples of Proxy design pattern in JDK?

What are the examples of Proxy design pattern in JDK?

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Proxy design pattern provides an extra level of indirection for

providing access to another object. It can also protect a real object

from any extra level of complexity.

In JDK there are many places where Proxy design pattern is used.

Some of these are as follows:

java.lang.reflect.Proxy

java.rmi.*

javax.inject.Inject

javax.ejb.EJB

javax.persistence.PersistenceContext

public class Demo {

    public static void main(String[] args) {
        YouTubeDownloader naiveDownloader = new YouTubeDownloader(new ThirdPartyYouTubeClass());
        YouTubeDownloader smartDownloader = new YouTubeDownloader(new YouTubeCacheProxy());

        long naive = test(naiveDownloader);
        long smart = test(smartDownloader);
        System.out.print("Time saved by caching proxy: " + (naive - smart) + "ms");

    }

    private static long test(YouTubeDownloader downloader) {
        long startTime = System.currentTimeMillis();

        // User behavior in our app:
        downloader.renderPopularVideos();
        downloader.renderVideoPage("catzzzzzzzzz");
        downloader.renderPopularVideos();
        downloader.renderVideoPage("dancesvideoo");
        // Users might visit the same page quite often.
        downloader.renderVideoPage("catzzzzzzzzz");
        downloader.renderVideoPage("someothervid");

        long estimatedTime = System.currentTimeMillis() - startTime;
        System.out.print("Time elapsed: " + estimatedTime + "ms\n");
        return estimatedTime;
    }
}

https://refactoring.guru/design-patterns/proxy/java/example

Popularity 3/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java proxy

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Contributed on Feb 10 2023

Pragya Keshap

0 Answers Avg Quality 2/10

What are the examples of Proxy design pattern in JDK?

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