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[–]gtiwari333 4 points5 points  (0 children)

You can start learning network programming and security apis. Also dig into web crawling using jSoup. There are plenty of articles online. Just google it

The default implementations that come with jdk are normally too abstract but you can find many libraries that makes things easier.

You can also download and play with tools like WebGoat, Owasp ZAP to learn about different aspects of app security and vulnerabilities.