then is a java keyword
then is not a java keyword, nor is it a java reserved word .
Java keyword list (51 keywords, 2 reserved words):
Access control: private protected public
Definition Classes, interfaces, abstract classes and implementation interfaces, keywords of inherited classes, instantiated objects: class abstract interface extends implements new
Modify methods, classes, properties and variables: static final super this native strictfp synchronized transient volatile
Program control statement: break continue return do while if else for instanceof switch case defautl
Error handling: try catch final throw throws assert
Package related: import package
Basic type: boolean byte char double float int long short null true false enum
Variable reference: super this void
Reserved word: const goto
Correct identification The keywords and reserved words of the Java language are very important. Java keywords have special meaning to the Java compiler. They are used to represent a data type, or to represent the structure of a program, etc. Reserved words are keywords reserved for Java. Although they are not used as keywords now, they may be used as keywords in future upgraded versions.
Notes
Identify the keywords of the java language and do not confuse them with the keywords of other languages such as c/c.
All keywords are lowercase
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