java基础--映射表Map

import java.util.*;class Employee{        public Employee(String n)        {                name = n;        }        public String name;}public class myTest{        public static void main(String[] args)        {                Map<String, Employee> staff = new HashMap<String, Employee>();                staff.put("144", new Employee("Mary"));                staff.put("157", new Employee("Tom"));                staff.put("186", new Employee("Jack"));                for(Map.Entry<String, Employee>  e: staff.entrySet()){                          //键值对是静态内部类Map.Entry的对象                        String key = e.getKey();                        Employee value = e.getValue();                        System.out.println("id: "+key+"\nname: "+value.name);                }        }}