Learn Java

Object-oriented backends and Android apps.

Java is a compiled, object-oriented language that runs on a virtual machine. Large backends, Android apps and enterprise systems are written in it.

The editor compiles and runs your program on our server, and shows the output and errors.

Java is common in college courses and in hiring for backend roles. Its classes and objects are the same ideas the OOP guides on our blog explain.

Start here

First program: Print “Hello, world!” with System.out.println, then read two numbers with Scanner and print their sum.

There are no Java lessons yet. The compiler is free and needs no account.

The practice problems accept JavaScript or Python. Work out the algorithm there, then write the same answer in Java in the editor above.

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