What is OOP and its basic concepts?

The object-oriented programming (OOP) is a different approach to programming and quite suitable for managing large and complex programs. An object oriented language combines the data to its function or code in such a way that access to data is allowed only through its function or code .

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Is Java free on Oracle?

You can download the latest OpenJDK release of Java from Oracle, for free , under an open source license from jdk.java.net. Oracle JDK 8 and Oracle JDK 11 are free for Personal, Development and other uses. Oracle JDK 17 and later release are available under a Oracle No-Fee Terms and Conditions License for all users.

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