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Method that is declared as only ever returning bool can also raise any exception that is an instance of java.lang.RuntimeException (which includes NullPointerEx

by dfox 3y ago

Method that is declared as only ever returning bool can also raise any exception that is an instance of java.lang.RuntimeException (which includes NullPointerException) this somewhat bizzare design which combines unchecked and checked exceptions is a source of major discussions since at least late 90's and has much to do with the current concept of null-safety.

hedora 3y ago
final Boolean foo = True … if (foo.booleanValue()) { } Can also NPE.
im3w1l 3y ago
It can also raise Errors. I know because this one really poorly designed library I used would raise Errors when asking it to decode certain invalid files.