安装scala时遇到的问题 lion@king:/opt$ scala Welcome to Scala 2.11.12 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_16…

问题代码： new Expanded( flex: 80, child: new Container( padding: EdgeInsets.fromLTRB(0.0, 50.0, 0.0, 50.0), color:…

use this val data = sc.textFile("/home/spark/data.txt") this should work and set master as local. Input path d…

1、brew install dos2unix 2、find . -type f -exec dos2unix {} \; 第二步的分号前有个\

导航到windows -> preferences -> java -> compiler -> Error/Warnings -> Potential Programming proble…

sbt编译spark程序提示value toDF is not a member of Seq() 前提 使用Scala编写的Spark程序，在sbt编译打包的时候提示value toDF is not a member…

Base64常用来表示字串加密过后的内容,使用Java 程式语言来实作Base64的编码与解码功能 1.在Java上做Base64的编码与解码，会使用到JDK里sun.misc套件下的BASE64Encoder和BASE…

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mongodb.MongoClien…

  Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear …

Very differently to AngularJS (v1.x), Angular now has a hierarchical dependency injector. That allows to speci…

  Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non…

Sonarlint检测出如下问题： Utility classes should not have public constructors 　　Utility classes, which are collections…