Welcome to the Ranch.
Download the
JDK from Oracle and a text editor, for example
Notepad++, and use the command-line tools from the JDK to compile and run your first programs. The
Oracle Java Tutorials are a good place to start. The
Hello World tutorial explains step by step how to write, compile and run your first Java program using a text editor and the command line.
It's better to first learn the programming language with simple tools, so that you learn the basics and can concentrate on learning Java. Eclipse is a big and complicated program, it's going to be a lot harder if you have to learn Java and Eclipse from scratch at the same time.