Generic.java

public interface Generic <N, NN> {
    N a(N n);

    @org.jetbrains.annotations.NotNull
    NN b(@org.jetbrains.annotations.NotNull NN nn);

    @org.jetbrains.annotations.Nullable
    N a1(@org.jetbrains.annotations.Nullable N n);

    @org.jetbrains.annotations.Nullable
    NN b1(@org.jetbrains.annotations.Nullable NN nn);
}