fun main() { KotlinBuilderDemo.KotlinBuilder().setBrand("HuaWei").setCpu("i7") }建造者模式
class KotlinBuilderDemo { constructor() class KotlinBuilder { constructor() fun setBrand(brand: String):KotlinBuilder { println(brand) return this } fun setCpu(cpu: String):KotlinBuilder { print(cpu) return this } } }
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