Scala的继承

最新推荐文章于 2025-04-30 11:51:30 发布

cufu3352

最新推荐文章于 2025-04-30 11:51:30 发布

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文章标签： scala java 大数据

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class Person1(val name : String, var age : Int){
println("The primary constructor of Person")
val school = "BJU"
def sleep = "8 hours"
override def toString = "I am a Person1!"
}

跟在java中一样，任何class都是默认继承自object ，这里override了toString方法

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class Worker(name : String, age : Int, val salary : Long) extends Person1(name, age){ //创建Worker实例时，也会使用name、age填充父类实例。子类也必须将父类的主构造器的参数填满
println("This is the subClass of Person, Primary constructor of Worker")
override val school = "Spark" //覆盖父类的属性
override def toString = "I am a Worker!" + super.sleep //super调用父类的方法
}

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object OverrideOperations{
def main(args: Array[String]) {
val w = new Worker("Spark", 5, 100000)
println("School :" + w.school)
println("Salary :" + w.salary)
println(w.toString())
}
}

结果：
The primary constructor of Person //先构造父类（跟java一样）
This is the subClass of Person, Primary constructor of Worker //构建子类
School :Spark // 属性被覆盖
Salary :100000 //子类属性
I am a Worker!8 hours //子类覆盖

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/28912557/viewspace-1839810/，如需转载，请注明出处，否则将追究法律责任。

转载于:http://blog.itpub.net/28912557/viewspace-1839810/