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benweidig/functional-programming-with-java-method-references-c9103cdf5f8-13.java Secret

Created September 19, 2022 16:25
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functional-programming-with-java-method-references-c9103cdf5f8-13.java
interface Predicate<T> {
boolean test(T value);
}
interface AlsoPredicate<T> {
boolean test(T value);
}
Predicate<String> isNull = $ -> $ == null;
AlsoPredicate<String> wontCompile = isNull;
// Error:
// incompatible types: java.util.function.Predicate<java.lang.String> cannot
// be converted to AlsoPredicate<java.lang.String>
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