lambda受检异常

public class Try {
    public Try() {
    }

    public static <T, R> Function<T, R> of(Try.UncheckedFunction<T, R> mapper) {
        Objects.requireNonNull(mapper);
        return (t) -> {
            try {
                return mapper.apply(t);
            } catch (Exception var3) {
                throw Exceptions.unchecked(var3);
            }
        };
    }

    public static <T> Consumer<T> of(Try.UncheckedConsumer<T> mapper) {
        Objects.requireNonNull(mapper);
        return (t) -> {
            try {
                mapper.accept(t);
            } catch (Exception var3) {
                throw Exceptions.unchecked(var3);
            }
        };
    }

    public static <T> Supplier<T> of(Try.UncheckedSupplier<T> mapper) {
        Objects.requireNonNull(mapper);
        return () -> {
            try {
                return mapper.get();
            } catch (Exception var2) {
                throw Exceptions.unchecked(var2);
            }
        };
    }

    @FunctionalInterface
    public interface UncheckedSupplier<T> {
        @Nullable
        T get() throws Exception;
    }

    @FunctionalInterface
    public interface UncheckedConsumer<T> {
        @Nullable
        void accept(@Nullable T t) throws Exception;
    }

    @FunctionalInterface
    public interface UncheckedFunction<T, R> {
        @Nullable
        R apply(@Nullable T t) throws Exception;
    }
}

Function 用法

User apply = Try.of((String userStr) -> {
  ObjectMapper objectMapper = new ObjectMapper();
  return objectMapper.readValue(userStr, User.class);
}).apply(s3);
System.out.println(apply);

Supplier 用法

User aaa = Try.of(() -> {
  System.out.println("走if");
  ObjectMapper objectMapper = new ObjectMapper();
  return objectMapper.readValue(s3, User.class);
}).get();

Consumer用法

String s3 = "{\"name\":221, \"id\":1}";

Try.of((String str) -> {
  ObjectMapper objectMapper = new ObjectMapper();
  User user = objectMapper.readValue(str, User.class);
  System.out.println(user);
}).accept(s3);

lambda中使用

User user2 = Optional.ofNullable(s3)
  .map(Try.of((String userStr) -> {
    ObjectMapper objectMapper = new ObjectMapper();
    return objectMapper.readValue(userStr, User.class);
  })).orElse(null);

predicate

objects.stream().filter(Try.predicate(user -> {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.readValue(s3, User.class);
    return user.getId().equals(1);
})).collect(Collectors.toList());

public static <T> Predicate<T> predicate(Try.UncheckedPredicate<T> mapper) {
    Objects.requireNonNull(mapper);
    return (t) -> {
        try {
            return mapper.test(t);
        } catch (Exception var3) {
            throw Exceptions.unchecked(var3);
        }
    };
}

@FunctionalInterface
public interface UncheckedPredicate<T> {
    @Nullable
    boolean test(T t) throws Exception;
}