scala 继承覆写使用示例

本文主要是介绍scala 继承覆写使用示例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

package com.sparktest/**
  *继承：
  * 1.成员没有被赋值，则必须是抽象的
  * 2.若想获取父类的数值，则需要提前定义
  *
  */

abstract class Person {val conter:Intval conterArray = new Array[Int](conter)
}class Sporter extends Person{override val conter: Int = 5
}//提前定义
//class Sporter extends {
//  override val conter: Int = 5
//} with Person

object OverrideField extends App {val s = new Sporterprintln(s.conterArray.length)//0
}

package com.sparktest/**
  *继承：
  * 1.成员没有被赋值，则必须是抽象的
  * 2.若想获取父类的数值，则需要提前定义
  *
  */

class Person {val conter:Int = 3
  val conterArray = new Array[Int](conter)
}//class Sporter extends Person{
//  override val conter: Int = 5
//}

//提前定义
class Sporter extends Person {override val conter: Int = 5
}object OverrideField extends App {val s = new Sporterprintln(s.conterArray.length)//0
}

package com.sparktest/**
  *继承：
  * 1.成员没有被赋值，则必须是抽象的
  * 2.若想获取父类的数值，则需要提前定义
  *
  */

class Person {val conter:Int = 3
  val conterArray = new Array[Int](conter)
}//class Sporter extends Person{
//  override val conter: Int = 5
//}

//提前定义
class Sporter extends {override val conter: Int = 5
} with Personobject OverrideField extends App {val s = new Sporterprintln(s.conterArray.length)//5
}

package com.sparktest/**
  *继承：
  * 1.成员没有被赋值，则必须是抽象的
  * 2.若想获取父类的数值，则需要提前定义
  *
  */

abstract class Person {val conter:Intval conterArray = new Array[Int](conter)
}class Sporter extends Person{override val conter: Int = 5
}class Programmer(val name:String, val salary:Double){final override def equals(other:Any): Unit ={//    两个对象真正相等的具体的比较逻辑
    val that = other.asInstanceOf[Programmer]if(that == null) false
    else name == that.name && salary == that.salary}final override def hashCode(): Int = name.hashCode() * 17 + salary.hashCode() * 9
}//提前定义
//class Sporter extends {
//  override val conter: Int = 5
//} with Person

object OverrideField extends App {val s = new Sporterprintln(s.conterArray.length)//0
}

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