scala對象簡單記錄
阿新 • • 發佈:2018-07-09
ray 簡單記錄 都在 per t對象 tst bstr err 方法
object Person { private val eyeNum = 2 def getEyeNum = eyeNum def main(args: Array[String]): Unit = { println(Person.getEyeNum) // 2 } }
abstract class Hello(var message:String) { def sayHello(name :String) } object HelloImpl extends Hello("hello"){ override def sayHello(name: String): Unit = { println(message + "," + name) } def main(args: Array[String]): Unit = { HelloImpl.sayHello("yxj") } }
/** * 一個類和一個object對象名字相同,都在一個.scala文件中,那麽他們就是伴生類和伴生對象 * * @param name * @param age */ class People(name:String , age:Int ) { def sayHello = println("hi," + name +", your age is " + age + ",your eyeNum is " + People.eyeNum) } object People { private val eyeNum = 2 def getEyeNum = eyeNum } object objectsTest{ def main(args: Array[String]): Unit = { val yy = new People("yxj" , 30) yy.sayHello } }
/** * object中apply方法的使用,簡化對象創建的過程 * */ class Apple(name:String ,age:Int) { println(name + "," + age) } object Apple{ // 伴生對象的apply簡化了創建伴生類的方式 def apply(name: String, age: Int): Apple = new Apple(name, age) def main(args: Array[String]): Unit = { val a = Apple("yxj" , 30) println(a) // 普通的創建類的過程 val a1 = new Apple("yxj" , 31) // 伴生對象定義了apply後,不需要在使用new關鍵字來創建一個類的對象實例了 } }
scala對象簡單記錄