map

src/senior/Collection/CollectioMap.kt

@@ -4,7 +4,9 @@ fun main(args: Array<String>) {
     // 不可变map
     var m: Map<String, String> = mapOf("a" to "A", "b" to "B", "c" to "C")
     println(m)
-
+    m.forEach{
+        println("key = ${it.key}, value = ${it.value}")
+    }
     println(m.get("a"))
     // 可变map
     var map: MutableMap<String, String> = mutableMapOf()
@@ -12,5 +14,21 @@ fun main(args: Array<String>) {
     map.put("pig", "猪")
     println(map)
 
+    // 集合大小
+    println("map size = " + map.size)
+
     println(map.get("pig"))
+
+    // 获取所有的键
+    var keys = map.keys
+    println(keys)
+    // 获取所有的值
+    var values = map.values
+    println(values)
+
+    // 遍历map
+    var entries = map.entries
+    entries.forEach{
+        println("key = ${it.key},value = ${it.value}")
+    }
 }