Atitit implementation of Java LINQ and comparison with the stream API

Atitit Implementation of Java LINQ and comparison with the stream API

1.1. The relationship between the Linq and stream APIs , and the main pros and cons 1

1.2. Scenarios for Linq and stream APIs 1

1.3. LINQ1 in Java

Linq comes from SQL, and we know that in the field of data query,SQL is a standardized DSL.

1.1. the relationship between the Linq and stream APIs , and the main pros and cons

Stream is more generalized andLINQ is more specific, focusing on the DSL of data query . Linq is a specialized stream.

in addition,LINQ is more DSL , more convenient and concise.

The stream is relatively low-level , more flexible, but slightly verbose.

1.2. Scenarios for Linq and stream APIs

LINQ is more useful for most occasions , after all, SQL is a standardized data query DSL API.

However, in a small number of occasions, simple query a list of the case, perhaps LINQ seems a bit verbose, thestream will be more concise.

in addition, using stream in non-data query areas is better.

1.3. LINQ in Java

The Java jdk does not implement the LINQ APIby default. Only third-party class libraries are implemented.

Although Java has a linq4j class library, but seemingly compiled, but not good use, had to implement the LINQ API itself.

Java implements LINQ, mainly using the static import

For example, the implementation of a list to do group aggregation query. For example, according to the monthly statistics recharge total amount

list result = Select ( Span style= "FONT-FAMILY:CALIBRI; Font-size:10.5000pt ">" month,sum (RECHG) as Total " " month " " total,desc "

author::  Nickname :Old Wow's claws( Full Name::AttilaxAkbar Al Rapanui Attilaksachanui) 

Kanji Name: Etila ( Ayron) , email:[email protected]

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Atitit implementation of Java LINQ and comparison with the stream API