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# Set Lambda expression Language: Suitable for server development: JAVA.net PHT c++, c ASP golang python... Front end: ios android H5 jsp... Database: MySQL Oracle BD2 Hbase MonggoDB redis, SQL sever... Big data: hadoop flume spark hive yarn zonokeeprer kafka sqoop,HDFS mr,scala... Lambda expression ...

How to use java data structure to write code Array data structure Initialization of arrays public static void main(String[] args) { int[] arrays = new int[5]; // Define and open up an array of length 3 // You can write the above code in two sentences int[] array = null; // Declare a variabl ...

The original source of the code: https://github.com/dmlc/xgboost/tree/master/demo/kaggle-higgs  1. Introduction of problems Competition website: https://www.kaggle.com/c/higgs-boson/ Higgs boson is a basic particle in the standard model, named after physicist Peter Higgs. On July 4, 2012, the Eur ...

Original Link: http://www.cnblogs.com/riasky/p/3507419.html 1. What is introspection? Self-reflection refers to self-evaluation, self-reflection, self-criticism, self-regulation and self-education. It is a method of self-moral cultivati ...

std::async, std::future creates background tasks and returns values. The thread is expected to return a value. std::async is a function template that starts an asynchronous task and returns a std::future object Asynchronous task: automatically create a thread and start executing the corresponding thread entry function, returning a std::futur ...

Functional Advancement Function parameter type The difference between self-adding of immutable data type and variable data type 1. Judging the values of gl_num and gl_list Namespace Scope Global and local variables global and nonlocal keywords Built-in function 1.abs() function 2.max() Function (Ite ...

I've been studying Java annotations and Java 8's new lambda expressions in the last few days, but it's still hot, haha. Recommendation 88: Implementing factory method patterns with enumeration is more concise The factory method pattern is "creating an object's interface, letting subclasses decide which class to instantiate, and delaying ...

Original Link: http://www.cnblogs.com/jellochen/p/the-extension-of-linq.html This article describes LINQ extensions in three ways: extended query operators, custom query operators, and simple simulation of LINQ to SQL. 1. Extended Query ...

Java 8-Stream Collection Operations Quick Start   Catalog Brief Introduction to Stream Why use Stream Instance data source Filter Map FlatMap Reduce Collect Optional Concurrent debugging Brief Introduction to Stream Java 8 introduced a new Stream API. Stream here is different from I/O streams. It is more like a colle ...

PyQt5 Quick Start (III) PyQt5 Basic Window Components QMainWindow 1. Brief introduction of window type QMainWindow, QWidget and QDialog are used to create windows. They can be used directly or derivatively.QMainWindow includes menu bar, toolbar, status bar, title bar and so on. It is the most common form of window.QDialog is the base class of ...