Learn Java Fundamentals: A Primer for Java Development and Programming

Appendix A: Reserved Words Quick Reference

Almost any valid identifier can be used to name a language feature. However, some identifiers are reserved for special use by Java. These reserved identifiers are known as reserved words. Figure A-1 reveals Java’s 53 reserved words.

A screenshot depicts the reserved words. They are abstract, byte, class, do, assert, Boolean, and break.

Figure A-1

The identifiers that Java reserves

JDK 9 added a single underscore character (_) to Java’s list of reserved words. It’s an error to use a single underscore to name anything. However, it’s okay to use multiple underscores (although you probably shouldn’t).

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