完成

test1/BasicSyntax.kt

@@ -32,8 +32,8 @@ fun main(array: Array<String>) {
     println(c)
 
     // 返回最大值
-    println(BasicSyntax(1.0,2.0).maxOf(1, 2))
+    println(BasicSyntax(1.0, 2.0).maxOf(1, 2))
-    println(BasicSyntax(1.0,2.0).maxOf2(1, 2))
+    println(BasicSyntax(1.0, 2.0).maxOf2(1, 2))
     println(maxOf3(1, 2))
 
     // 循环
@@ -44,6 +44,43 @@ fun main(array: Array<String>) {
     for (index in items.indices) {
         println(index)
     }
+
+    // 有多少元素
+    val readOnlyShapes = mutableListOf("triangle", "square", "circle")
+    println("readOnlyShapes有：${readOnlyShapes.count()}个元素")
+    println("triangle" in readOnlyShapes)
+    // 添加元素
+    readOnlyShapes.add("YYY")
+    println(readOnlyShapes)
+    // 移出元素
+    readOnlyShapes.remove("triangle")
+    println(readOnlyShapes)
+
+    // Set相关操作
+    val readOnlyFruit = setOf("apple", "banana", "cherry", "cherry")
+    val mutableSetOf = mutableSetOf(readOnlyFruit)
+    println(readOnlyFruit)
+    println(mutableSetOf)
+    println("This set has ${readOnlyFruit.count()} items")
+
+
+    // map 操作
+    val readOnlyJuiceMenu = mapOf("apple" to 100, "kiwi" to 190, "orange" to 100)
+    println(readOnlyJuiceMenu)
+    // {apple=100, kiwi=190, orange=100}
+
+    // Mutable map with explicit type declaration
+    val juiceMenu: MutableMap<String, Int> = mutableMapOf("apple" to 100, "kiwi" to 190, "orange" to 100)
+    println(juiceMenu)
+
+    val SUPPORTED = setOf("HTTP", "HTTPS", "FTP")
+    val requested = "smtp"
+    val isSupported = requested.uppercase() in SUPPORTED // Write your code here
+    println("Support for $requested: $isSupported")
+
+    val number2word = mapOf(1 to "one", 2 to "tow") // Write your code here
+    val n = 2
+    println("$n is spelt as '${number2word[2]}'")
 }
 
 fun sum(a: Int, b: Int): Int {
@@ -76,4 +113,5 @@ class BasicSyntax(height: Double, length: Double) {
 and ends here. */
 
 
-fun maxOf3(a:Int,b:Int)=if (a>b)a else b
+fun maxOf3(a: Int, b: Int) = if (a > b) a else b
+