corejava第10版

corejava第10版/v1ch09/map/MapTest.java

@@ -0,0 +1,42 @@
+package map;
+
+import java.util.*;
+
+/**
+ * This program demonstrates the use of a map with key type String and value type Employee.
+ * @version 1.12 2015-06-21
+ * @author Cay Horstmann
+ */
+public class MapTest
+{
+   public static void main(String[] args)
+   {
+      Map<String, Employee> staff = new HashMap<>();
+      staff.put("144-25-5464", new Employee("Amy Lee"));
+      staff.put("567-24-2546", new Employee("Harry Hacker"));
+      staff.put("157-62-7935", new Employee("Gary Cooper"));
+      staff.put("456-62-5527", new Employee("Francesca Cruz"));
+
+      // print all entries
+
+      System.out.println(staff);
+
+      // remove an entry
+
+      staff.remove("567-24-2546");
+
+      // replace an entry
+
+      staff.put("456-62-5527", new Employee("Francesca Miller"));
+
+      // look up a value
+
+      System.out.println(staff.get("157-62-7935"));
+
+      // iterate through all entries
+
+      staff.forEach((k, v) -> 
+         System.out.println("key=" + k + ", value=" + v));
+   }
+}
+