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Kotlin 学习笔记
1. String
1.1 字符串转化为字符数组
toCharArray(),相当于java的toCharArray()
/**
* 字符串转化为字符数组 toCharArray(),相当于java的toCharArray()
*/
val str:String = "Hello"
val chars = str.toCharArray()
for (i in 0 until chars.size){
println("i: " + i + ", ch: " + chars[i])
}
1.2 字符数组转化为字符串
String(array),相当于Java的String.valueOf(array)
/**
* 字符数组转化为字符串 String(array),相当于Java的String.valueOf(array)
*/
val array1:CharArray = charArrayOf('a','b','c')
println(String(array1))
2. 循环
2.1 for循环中,0..n表示从0到n
val n:Int = 10
/**
* for循环中,0..n表示从0到n
*/
for (i in 0..n){
println(i)
}
2.2 for循环中,0 until n表示从0到n-1
val n:Int = 10
/**
* for循环中,0 until n表示从0到n-1
*/
for (i in 0 until n){
println(i)
}
2.3 循环遍历数组元素
使用for-each
val words:Array<String> = arrayOf("a", "bb", "acd", "ace")
for (word:String in words) {
println(word)
}
3. 数组
3.1 新建一个数组,指定长度
val result: IntArray = IntArray(len)
3.2 使用intArrayOf()初始化数组元素,类似还有booleanArrayOf()等:
val arrA = intArrayOf(12, 28, 46, 32, 50)
3.3 字符串数组
val words:Array<String> = arrayOf("a", "bb", "acd", "ace")