JavaFX has four primitive data types:

• String
• Boolean
• Number
• Integer

The JavaFX types correspond to the following Java types:

JavaFX	Java
String	java.lang.String
Boolean	java.lang.Boolean
Number	java.lang.Number
Integer	byte, short, int, long, BigInteger

For more information see https://openjfx.dev.java.net/JavaFX_Programming_Language.html#basic_types