Appendix B. Comparing Java and C# keywords
Table B.1 shows the closest matching C# equivalents to the 49 Java keywords.
| Java keyword | Closest C# equivalent | Comments |
|---|---|---|
| abstract | abstract | |
| assert [3] | - | Use the Debug.Assert static method in C# instead |
| boolean | bool | |
| break | break | |
| byte | sbyte | An sbyte is a signed 8-bit numeric simple type, while byte is an unsigned 8-bit numeric simple type in C# – Java's primitive types are all signed |
| case | case | |
| catch | catch | |
| char | char | |
| class | class | |
| const* | const | This keyword is reserved in Java, but not used – in C#, const is used to declare a constant |
| continue | continue | |
| default | default | |
| do | do | |
| double | double | |
| else | else | |
| extends | - | In C#, : is used to denote class inheritance instead of using the extends keyword |
| native | extern | |
| final | const/readonly | Java final variables are similar to C# constants and read-only variables, though there are differences between the latter two |
| finally | finally | |
| float | float | |
| for | for | |
| goto [1] | goto | Java's goto keyword has no functionality although it is reserved – C#'s goto keyword can be used to 'jump' to a labeled statement |
| if | if | |
| implements | - | In C#, : is used to denote interface implementation instead of using the implements keyword |
| import | using | |
| instanceof | is | |
| int | int | |
| interface | interface | |
| long | long | |
| native | extern | |
| new | new | |
| package | namespace | |
| private | private | |
| protected | protected | |
| public | public | |
| return | return | |
| short | short | |
| static | static | |
| strictfp [2] | - | |
| super | base | |
| switch | switch | |
| synchronized | lock | |
| this | this | |
| throw | throw | |
| throws | - | All exceptions in C# are unchecked – unchecked exceptions are automatically propagated backwards to the calling method if not handled without the need to specify the throws clause in the method prototype |
| transient | - | |
| try | try | |
| void | void | |
| volatile | volatile | |
| while | while |
[3] added into the Java language in Java 2 SDK 1.4
[1] reserved but not used in Java
[2] added into the Java language in Java 2
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