Affects PMD Version: 6.19.0
Rule: MissingStaticMethodInNonInstantiatableClass
Description: if a class has only private constructors, it still may contain inner static inheritors. It is useful when implementing an ADT.
Code Sample demonstrating the issue:
public abstract class MyADT {
private MyADT() {
}
public abstract <R> R map(
Function<String, ? extends R> onString,
Function<Integer, ? extends R> onInt
);
public static final class StringHolder extends MyADT {
private final String string;
public StringHolder(String string) {
this.string = string;
}
@Override
public <R> R map(Function<String, ? extends R> onString, Function<Integer, ? extends R> onInt) {
return onString.apply(string);
}
}
public static final class IntHolder extends MyADT {
private final Integer integer;
public IntHolder(Integer integer) {
this.integer = integer;
}
@Override
public <R> R map(Function<String, ? extends R> onString, Function<Integer, ? extends R> onInt) {
return onInt.apply(integer);
}
}
}
Running PMD through: Gradle
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4