println(b is Int) // true

Author: 之剑

src/com/kotlin/tutorials/lec01/HelloKotlin.kt

@@ -12,26 +12,27 @@ fun main(args: Array<String>) {
     var b = 1
     b = b + 1
     println(b)
+    println(b is Int) // true
 
     // String
     val s = "Kotlin"
     println(s.length)
-    println(s[0])
-    println(s.subSequence(0, 3))
-    // Array
+    println(s[0]) // K
+    println(s.subSequence(0, 3)) // Kot
+    // Array 数组
     val intArray = arrayOf(1, 2, 3, 4, 5)
     println(intArray)
     for (e in intArray) {
         println(e)
     }
 
-    // List
+    // List 列表
     val list = listOf("Kotlin", "Java", "Scala", "C", "C++", "Python")
     println(list)
     for (e in list) {
         println(e)
     }
-    // Map
+    // Map 字典，映射表。 Pair 二元组
     val map = hashMapOf(1 to "A", 2 to "B", 3 to "C")
     println(map)
     for (e in map) {