kotlin状态模式

/**
* 状态模式
*/

interface State {

fun shopping()

fun move()

}

class Loving : State {

override fun move() {

println("一起看电影")

}

override fun shopping() {

println("一起看逛街")

}

}

class NoLove : State {

override fun move() {

println("不看电影")

}

override fun shopping() {

println("一个人逛街")

}

}

class Context2 {

private var mState: State? =null

    private fun setState(state: State) {

mState = state

}

fun inLove() {

setState(Loving())

}

fun outLove() {

setState(NoLove())

}

fun move() {

mState!!.move()

}

fun shopping() {

mState!!.shopping()

}

}

fun main(args: Array) {

val context  = Context2()

context.inLove()

context.move()

context.shopping()

context.outLove()

context.move()

context.shopping()

}