qq_15009447的博客

package inClass import java.sql.{Connection, DriverManager} //伴生类 class MysqlUtil{ } object MysqlUtil { implicit class Mysql(obj:Demon02MySql){ private var driver="com.mysql.jdbc.Driver" private var url="jdbc:mysql://192.168.107.1

在 //1.................. var a=Array(1,2,3) // println(a.apply(1))//println(a(1)) //2................... val a1=Array(1,2,3) val a2=List(1,2) // println(a1.canEqual(a2)) //3.................. val a3=Array('a','b','c') //

//1........... val arr=Array(1,2,3,4,5) // println(arr.getClass.getName) //[I val arr2 = arr.map(_*2) // arr2.foreach(print) //246810 //2............ val str = arr2.mkString(",") // println(str) //2,4,6,8,10