1 数组-定长数组(声明泛型) 第一种方式定义数组 这里的数组等同于Java中的数组,中括号的类型就是数组的类型 val arr1 = new Array[Int](10) //赋值,集合元素采用小括号访问 arr1(1) = 7 val arr01 = new Array[Int](4) println(arr01.length) println("arr01(0)=" + arr01(0)) for (i <- arr01) { println(i) } println(&q
synchronized - Only a single thread can execute a method or block at one time. Not only does synchronization prevent a thread from observing an object in an inconsistent state, but it ensures that each thread entering a synchronized method or block s
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps; at org.apache.spark.util.Utils$.getCallSite(Utils.scala:1440) at org.apache.spark.SparkContext.<init>
Java 8 日期和时间 声明 本文转自http://www.journaldev.com/2800/java-8-date-localdate-localdatetime-instant,以markdown格式整理,方便大家查看. Java 8 Date – LocalDate, LocalDateTime, Instant //JUNE 3, 2016 BY PANKAJ 4 COMMENTS// Java 8 Date Time API is one of the most sought
[Java心得总结六]Java容器中——Collection在前面自己总结的一篇博文中对Collection的框架结构做了整理,这里深究一下Java中list的实现方式 1.动态数组 In computer science, a dynamic array, growable array, resizable array, dynamic table, mutable array, or array list is a random access, variable-size list data
1. Translating Java Classes to Scala Classes Example 1: # a class declaration in Java public class Book{} # Scala equivalent of a class declaration class Book Example 2: # a Java class with a Construtor public class Book{ private final int isbn; priv