|NO.Z.00030|——————————|BigDataEnd|——|Hadoop&Scala.V03|——|Scala.v03|类与对象|Bean属性|

一、Bean属性

### --- Bean属性概述

~~~     JavaBean规范把Java属性定义为一堆getter和setter方法。
~~~     类似于Java，当将Scala字段标注为 @BeanProperty时，getFoo和setFoo方法会自动生成。
~~~     使用@BeanProperty并不会影响Scala自己自动生成的getter和setter方法。

### --- 在使用时需要导入包scala.beans.BeanProperty

import scala.beans.BeanProperty
class Teacher {
    @BeanProperty var name:String = _
}
object BeanDemo{
    def main(args: Array[String]): Unit = {
        val tea: Teacher = new Teacher
        tea.name = "zhagnsan"
        tea.setName("lisi") //BeanProperty生成的setName方法
        println(tea.getName) //BeanProperty生成的getName方法
}
}

### --- 上述Teacher类中共生成了四个方法：

1. name: String
2. name_= (newValue: String): Unit
3. getName(): String
4. setName (newValue: String): Unit

二、编程实现

### --- 编程实现

package yanqi.cn.part04

//需要导入下面的包

import scala.beans.BeanProperty

class Teacher {
  @BeanProperty
  var name: String = _
}

object BeanDemo {
  def main(args: Array[String]): Unit = {
    val teacher=new Teacher
    teacher.name="jacky"
    teacher.name_=("tom")
    println(teacher.name)
    //BeanProperty生成的setName方法
    teacher.setName("lisi")
    //BeanProperty生成的getName方法
    println(teacher.getName)
  }
}

### --- 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=55551: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.part04.BeanDemo
tom
lisi

Process finished with exit code 0

---

 

 

 

 

 

 

 

 

 

---

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

---