Is there a Newline constant defined in Java like Environment.Newline in C#?

As of Java 7 (and Android API level 19):

System.lineSeparator()

Documentation: Java Platform SE 7

For older versions of Java, use:

System.getProperty("line.separator");

See https://java.sun.com/docs/books/tutorial/essential/environment/sysprop.html for other properties.