scala中Trait简单使用
Posted yxj0728
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trait Log {
def log(message:String) = println("log:" + message)
}
/**
* 为实例混入trait
*
*/
trait Logs{
def log(message:String){}
}
trait MyLog extends Logs {
override def log(message: String): Unit = {
println("log:" + message)
}
}
class MixTraitUse(val name:String) extends Logs {
def sayHello{
println("hello " + name)
log("sayHello method invoked!!")
}
}
object MixTraitUseTest{
def main(args: Array[String]): Unit = {
val mix1 = new MixTraitUse("yxj")
mix1.sayHello
val mix2 = new MixTraitUse("yyy") with MyLog
mix2.sayHello
}
trait Handler {
def handler(data: String) {}
}
trait DataValidTrait extends Handler {
override def handler(data: String): Unit = {
println("this is DataValidTrait handler invoked.")
super.handler(data)
}
}
trait SignatureTrait extends Handler {
override def handler(data: String): Unit = {
println("this is SignatureTrait handler invoked.")
super.handler(data)
}
}
class ChainPerson(name: String) extends SignatureTrait with DataValidTrait {
def sayHello(data: String) {
println("sayHello from " + name)
handler(data)
}
}
object TraitChainUse {
def main(args: Array[String]): Unit = {
val p1 = new ChainPerson("yxj")
p1.sayHello("chanin data")
}
}
trait Loger {
println("loger constructor ..")
}
trait MyLoger extends Loger{
println("MyLoger constructor...")
}
trait TimeLoger extends Loger{
println("TimeLogers constructor...")
}
class TraitConstructor {
println("trait constructor")
}
class SubTrait extends TraitConstructor with MyLog with TimeLoger {
println("subtrait contructor...")
}
object tcT{
def main(args: Array[String]): Unit = {
val sub = new SubTrait
}
}
class People(val name:String) extends Log {
def makeFriends(p:People) ={
println("hello, " + p.name + " i‘m " + name + ",i want to make friends with you ")
log("makeFriends method invoked with parameter " + p.name)
}
}
object TraitLoggerUse{
def main(args: Array[String]): Unit = {
val s1 = new People("yxj")
val s2 = new People("wulanlan")
s1.makeFriends(s2)
}
}
trait HelloTrait{
def sayHello(name:String)
}
/**
* trait 中定义的field，继承的类，可以直接获取到使用
*
*/
trait MakeTrait{
val eyeNum:Int = 2
def makeFriends(p:Person)
}
class Person(val name:String) extends HelloTrait with MakeTrait {
def sayHello(otherName:String) = {
println("hello " +otherName + ", im " + name + ", i have " + eyeNum + " eyes.")
}
def makeFriends(p: Person): Unit = {
println("hello " + p.name + ",i‘m " + name + ",i want to make friends with you.")
}
}
object useTrait{
def main(args: Array[String]): Unit = {
val p1 = new Person("yxj")
val p2 = new Person("wulanlan")
p1.sayHello("yy")
p2.sayHello("zz")
p1.makeFriends(p2)
}
}
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