14.7.3

package jihe;

public class Emp {
    private String Id;
    private String Name;
    public Emp(String id, String name)
    {
        Id = id;
        Name = name;
    }
    public String getId()
    {
        return Id;
    }
    public String getName()
    {
        return Name;
    }
}

        //14.7.3
        Emp our1 = new Emp("012", "哈哈");
        Emp our2 = new Emp("013", "呵呵");
        Emp our3 = new Emp("014", "嘿嘿");
        Emp our4 = new Emp("015", "哼哼");
        Emp our5 = new Emp("016", "呼呼");
        TreeMap<String, String> stu = new TreeMap<>();

          stu.put(our1.getId(), our1.getName());
          stu.put(our2.getId(), our2.getName());
          stu.put(our3.getId(), our3.getName());
          stu.put(our4.getId(), our4.getName());
          stu.put(our5.getId(), our5.getName());

        Set<String> t = stu.keySet();
        for(String s : t)
        {
            System.out.println(s+stu.get(s));
        }
        System.out.println();
        stu.remove("015");
        Set<String> ct = stu.keySet();
        for(String s : t)
        {
            System.out.println(s+stu.get(s));
        }