This is a simple Text Editor built on Java with syntax highlighting using RSyntaxTextArea*
Windows: javac -classpath \rsyntaxtextarea.jar Document.java
Unix: javac -classpath /rsyntaxtextarea.jar Document.java
Windows: java -classpath \rsyntaxtextarea.jar;. Document
Unix: java -classpath /rsyntaxtextarea.jar:. Document
*RSyntaxTextArea is a customizable, syntax highlighting text component for Java Swing applications. Out of the box, it supports syntax highlighting for over 30 programming languages. - https://github.com/bobbylight/RSyntaxTextArea