第 27 章 从 Java 到 Kotlin

				
"1".toInt()			
				
				

				
        val PATTERN: MutableList<String> = object : ArrayList<String>() {
            init {
                add(".*(?:发言|说话)人(\\d+).*")
                add(".*(?:发言|说话)人(一|二|三|四|五|六|七|八|九|十).*")
                add(".*(?:发言|说话)人(一|二|三|四|五|六|七|八|九|十).*")
                //            add("(.*)的观点.*");
            }
        }
				
				

				
val arrayList = ArrayList<String>()
arrayList.add("Java")
arrayList.add("Kotlin")
arrayList.add("Python")
println("ArrayList: $arrayList")				
				
				

				
listOf("debug", "dev").contains(BuildConfig.BUILD_TYPE)			
				
				

				
val contact =
            mapOf(
                "BG7NYT" to "177",
                "BG7NEG" to "172",
                "BG7JWV" to "179",
                "BI7XYS" to "190",
                "BD7KBF" to "4612194"
            )

contact.values.toTypedArray()
				
				

				
   // 创建可变列表集合
    var mutableList = mutableListOf("Tom", "Jerry")
    // 添加元素
    mutableList.add("Jack")
    // 删除元素
    mutableList.remove("Tom")
    println(mutableList)

    // 将 可变列表集合 转为 只读列表集合
    val list: List<String> = mutableList.toList()
    // 将 只读列表集合 转为 可变列表集合
    val mutable: MutableList<String> = list.toMutableList()				
				
				

筛选并删除元素

				
fun main() {
    // 创建可变列表集合
    val mutableList = mutableListOf("Tom", "Jerry")
    // 通过 Lambda 表达式筛选要操作的元素
    // 删除包含 字母 T 的元素
    mutableList.removeIf {
        it.contains("T")
    }
    println(mutableList)
}

				
				

				
var content = meetingDao.findByTaskId(meetingData.taskId).forEach { (id, taskId, time, speaker, sentence) ->
                Log.d(TAG, sentence)
            }				
				
				

				
var content = meetingDao.findByTaskId("5b4a5bd92da847d292ed74ae696a7ca1").map({ "${it.time} 发言人${it.speaker} ${it.sentence}" }).joinToString(separator = "\n")
Log.d(TAG, content)				
				
				

				
        val digit: MutableMap<String?, String?> = object : HashMap<String?, String?>() {
            init {
                put("一", "1")
                put("二", "2")
                put("三", "3")
                put("四", "4")
                put("五", "5")
                put("六", "6")
                put("七", "7")
                put("八", "8")
                put("九", "9")
                put("十", "10")
                put("零", "0")
            }
        }				
				
				

				
 mapOf("content" to "hello world")
				
				

				
 val originalMap = mapOf("a" to 1, "b" to 2, "c" to 2)

// 反转键值对（注意：如果值有重复，会导致键冲突，后面的键会覆盖前面的）
val reversedMap = originalMap.associateBy({ it.value }, { it.key })

println(reversedMap) // 输出: {1=a, 2=c}（值2对应的原键"b"被覆盖）
				
				

				
ConcurrentHashMap<String, String> speakers = new ConcurrentHashMap<>();
        speakers.put("1", "发言人一");
        speakers.put("2", "市场部小周");
        speakers.put("4", "陈先生");
        speakers.put("5", "齐天大圣");
        speakers.put("6", "一品轩小飞");
        speakers.put("7", "年年富");
        speakers.put("8", "李总");		
val invertedMap: Map<String, String> = speakers.entries.associateBy({ it.value as String }, { it.key as String })