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                `Kotlin`中提供了延遲加載(又稱懶加載)功能,當變量被訪問時才會被初始化,這樣不僅可以提高程序效率,還可以讓程序啟動更快。延遲加載是通過“`by lazy`”關鍵字標識的,延遲加載的變量要求聲明為`val`,即不可變變量,相當于`Java`中用`final`關鍵字修飾的變量。 ~~~ fun main() { val name by lazy { // do something "張三" } println(name) } ~~~ 結果為: ``` 張三 ```
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