History

Java is an OOP (object-oriented language) developed by Sun Microsystems in 1995. Java is open source. It was created to allow programmers to "write once, run anywhere" (Use on multiple devices by having the least dependencies possible).

Reasons to use Java

Game Development. (Examples: Minecraft)
Cloud Computing
Web Applications
Mobile Development
Desktop Applications
When you want to create something for multiple devices

When not to use Java

Front-end web development

Java's speed

Because Java is a higher-level language than C, it will comparatively run slower. But, compared to languages like Python (which are interpreted), Java is much faster.

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