|NO.Z.00012|——————————|BigDataEnd|——|Hadoop&Scala.V12|——|Scala.v12|Scala编程|对象相等性|

一、对象相等性

### --- Java 中可以 == 来比较基本类型和引用类型：

~~~     对基本类型而言，比较的是值的相等性
~~~     对引用类型而言，比较的是引用相等性，即两个变量是否指向JVM堆上的同个对象

### --- Scala中，要比较两个基础类型的对象是否相等，可以使用 == 或 !=；

1 == 1
1 != 2
2 == 2

~~~     # == 或 != 可以比较同一类型的两个对象；

List(1,2,3) == List(1,2,3)
List(1,2,3) != Array(4,5,6)

~~~     # 或 != 还可以比较不同类型的两个对象：

2 == 2.0
List(1,2,3) == "Scala"

### --- 编程代码

package yanqi.cn.part01

object ObjectCompareDemo {
  def main(args: Array[String]): Unit = {
    println(1==1)
    println(1!=2)
    println(1==2)

    val flag=List(1,2,3)==List(4,5,6)
    println(flag)

    println(List(1,2,3)!=Array(1,2,3))

    //比较不同类型的对象
    println(2==2.0)
    println(List(1,2,3)=="Scala")
  }
}

### --- 编译打印

D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=52219:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath D:\JAVA\jdk1.8.0_231\jre\lib\charsets.jar;D:\JAVA\jdk1.8.0_231\jre\lib\deploy.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\access-bridge-64.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\cldrdata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\dnsns.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jaccess.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\jfxrt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\localedata.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\nashorn.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunec.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunjce_provider.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunmscapi.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\sunpkcs11.jar;D:\JAVA\jdk1.8.0_231\jre\lib\ext\zipfs.jar;D:\JAVA\jdk1.8.0_231\jre\lib\javaws.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jce.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfr.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jfxswt.jar;D:\JAVA\jdk1.8.0_231\jre\lib\jsse.jar;D:\JAVA\jdk1.8.0_231\jre\lib\management-agent.jar;D:\JAVA\jdk1.8.0_231\jre\lib\plugin.jar;D:\JAVA\jdk1.8.0_231\jre\lib\resources.jar;D:\JAVA\jdk1.8.0_231\jre\lib\rt.jar;E:\NO.Z.10000——javaproject\NO.Z.00002.Hadoop\ScalaPro\out\production\ScalaPro;D:\JAVA\scala-2.12.2\lib\scala-library.jar;D:\JAVA\scala-2.12.2\lib\scala-reflect.jar yanqi.cn.part01.ObjectCompareDemo
true
true
false
false
true
true
false

Process finished with exit code 0

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

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