1.懒汉式
package com.atguigui.bigdata.chapter06
object TestSingleTon {
def main(args: Array[String]): Unit = {
val singleTon = SingleTon.getInstance
val singleTon1 = SingleTon.getInstance
println(singleTon.hashCode()+ " " + singleTon1.hashCode())
println(singleTon == singleTon1)
}
}
//构造方法私有化
class SingleTon private() {
}
object SingleTon {
private var s: SingleTon = null
def getInstance = {
if (s == null) {
s = new SingleTon
}
}
}
2.饿汉式
package com.atguigui.bigdata.chapter06
object TestSingleTon extends App {
val singleTon = SingleTon.getInstance
val singleTon2 = SingleTon.getInstance
println(singleTon.hashCode() + " ~ " + singleTon2.hashCode())
println(singleTon == singleTon2)
}
//将SingleTon的构造方法私有化
class SingleTon private() {
println("~~~")
}
object SingleTon {
private val s: SingleTon = new SingleTon
def getInstance = {
s
}
}
