HashMap和TreeMap

src/chapter6/Example14.java

@@ -1,4 +1,27 @@
 package chapter6;
 
+import java.util.HashMap;
+
 public class Example14 {
+    public static void main(String[] args) {
+        HashMap map = new HashMap(); // 创建Map对象
+        map.put("1","张三");//存储键和值
+        map.put("2","李四");
+        map.put("3","王五");
+        map.put("3", "赵六");
+
+        System.out.println("1：" + map.get("1")); // 根据键获取值
+        System.out.println("2: " + map.get("2"));
+        System.out.println("3: " + map.get("3"));
+        System.out.println("键值对数量：" + map.size());
+
+//        if (map.containsKey("1")) {
+//            System.out.println("1号存在");
+//        }
+//
+//        if (map.containsValue("李四")) {
+//            System.out.println("李四存在");
+//        }
+
+    }
 }