10.16习题3

HashMap<String,String> Emp = new HashMap<>();
        
        Emp.put("010", "北京市");
        Emp.put("021", "上海市");
        Emp.put("0531", "济南市");
        Emp.put("0533", "淄博市");
        Emp.put("015", "天津市");
        
        Emp.remove("015");
        
        Set<String> S = Emp.keySet();
        
        for(String s4 : S)
        {
            System.out.println("Key:" + s4 +" Value:" + Emp.get(s4));
        }