The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
SeeDev.java for updated tutorials taking advantage of the latest releases.
SeeJava Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
SeeJDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
Here is a list of keywords in the Java programming language. You cannot use any of the following as identifiers in your programs. The keywordsconst andgoto are reserved, even though they are not currently used.true,false, andnull might seem like keywords, but they are actually literals; you cannot use them as identifiers in your programs.
abstract | continue | for | new | switch |
assert*** | default | goto* | package | synchronized |
boolean | do | if | private | this |
break | double | implements | protected | throw |
byte | else | import | public | throws |
case | enum**** | instanceof | return | transient |
catch | extends | int | short | try |
char | final | interface | static | void |
class | finally | long | strictfp** | volatile |
const* | float | native | super | while |
| * | not used | |
| ** | added in 1.2 | |
| *** | added in 1.4 | |
| **** | added in 5.0 |
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