rainerosion/kotlin-study-demo
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非空调用

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luming 2021-06-29 13:51:16 +08:00
parent ed929baed7
commit 90be696c18
1 changed files with 9 additions and 0 deletions
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9
src/basic/Variable.kt
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@ -99,4 +99,13 @@ fun main() {
it == 6L it == 6L
} }
println(index) println(index)
// 可空变量
var str: String? = null
// 安全调用符
println(str?.length)
// 默认值
println(str?.length ?: "默认值")
// 非空断言 为空 运行时抛空指针异常
println(str!!.length)
} }