package test3. 

Public class Employee implements Comparable {
Private int ID; private String name; Private char sex; 
private int age; Private int salary; 
Public Employee (int ID, String name, char sex, int the age, int salary) {
This. ID=ID; 
this.name=name; 
This. Sex=sex; 
this.age=age; 
This. Salary=salary; 
} 
Public int getID () {
Return the ID; 
} 
Public String getName () {
return name; 
} 
Public char getSex () {
return sex; 
} 
Public int getAge () {
return age; 
} 
Public int getSalary () {
Return the salary; 
} 
Public String toString () {
Return ID + ", "+ name + + +", "sex", "+ +", "age, salary; 
} 
@ Override 
Public int compareTo (Employee) o {
If (this. Salary> Grown alary) {
return 1; 
} else if (this. Salaryreturn -1; 
} 
return 0; 
} 
} 

 package test3. 

import java.util.ArrayList; 
Import the Java. Util. Collections; 
Import the Java. Util. HashMap; 
import java.util.List; 

Public class ExampleMap {
HashMap Hmap=new HashMap (); 
Public void addEmployee (Employee e) {
Hmap. Put (um participant etID (), e); 
} 
Public String getEmployee would (int id) {
The Employee e=null; 
For (Integer key: hmap keySet ()) {
If (key==id) {
E=hmap. Get (key); 
} 
} 
Return e. oString (); 
} 
Public void deleteEmployee (int id) {
For (Integer key: hmap keySet ()) {
If (key==id) {
Hmap. Remove (key); 
} 
} 
} 
Public void updateEmployee (Employee e) {
For (Integer key: hmap keySet ()) {
If (key==um participant etID ()) {
Hmap. Put (key, e); 
} 
} 
} 
Public void showAllEmployee () {
For (Integer key: hmap keySet ()) {
System. The out. Println (hmap. Get (key). The toString ()); 
} 
} 
Public void sortBySalary () {
List the List=new ArrayList (hmap entrySet ()); 
The Collections. The sort (list); 
For (Integer key: hmap keySet ()) {
System. The out. Println (hmap. Get (key). The toString ()); 
} 
} 
} 

 package test3. 

import java.util.Scanner; 
Public class test {
Public static void main (String [] args) {
ExampleMap em=new ExampleMap (); 
While (true) {
System. The out. Println (" * * * * * * * * * * * * employee management System "); 
System. The out. Println (" 1. Add the employee "); 
System. The out. Println (" 2. Show all employee information "); 
System. The out. Println (" 3. According to the ID number for employees "); 
System. The out. Println (" 4. Modify the employee information "); 
System. The out. Println (" 5. According to the id number to delete employees "); 
System. The out. Println (" 6. Sort by salary "); 
System. The out. Println (" 7. Quit "); 
System.out.println("********************"); 
System. The out. Println (" please enter a number: "); 
Scanner sc=new Scanner(System.in); 
Int bh=sc. NextInt (); 
The switch (bh) {
Case 1: 
System. The out. Println (" you chose to add employees "); 
System. The out. Println (" please enter the id number: "); 
Int ID=sc. NextInt (); 
System. The out. Println (" please input your name: "); 
String name=sc. Next (); 
System. The out. Println (" please enter the gender: "); 
Char sex=sc. Next (). CharAt (0); 
System. The out. Println (" please enter the age: "); 
Int the age=sc. NextInt (); 
System. The out. Println (" please enter the salary: "); 
Int salary=sc. NextInt (); 
The Employee e=new Employee (ID, name, sex, age, salary). 
Em. AddEmployee (e); 
break; 
Case 2: 
System. The out. Println (" you select the show all employee information "); 
Em. ShowAllEmployee (); 
break; 
Case 3: 
System. The out. Println (" you choose according to the ID to find employees "); 
System. The out. Println (" please enter to find your id number: "); 
ID=sc. NextInt (); 
Em. GetEmployee would (ID); 
break; 
Case 4: 
System. The out. Println (" please enter the employee information: "); 
System. The out. Println (" please enter the id number: "); 
ID=sc. NextInt (); 
System. The out. Println (" please input your name: "); 
Name=sc. NextLine (); 
System. The out. Println (" please enter the gender: "); 
Sex=sc. Next (). CharAt (0); 
System. The out. Println (" please enter the age: "); 
Age=sc. NextInt (); 
System. The out. Println (" please enter the salary: "); 
Salary=sc. NextInt (); 
E=new Employee (ID, name, sex, age, salary). 
Em. UpdateEmployee (e); 
break; 
Case 5: 
System. The out. Println (" please enter the id number you are trying to remove: "); 
ID=sc. NextInt (); 
Em. DeleteEmployee (ID); 
break; 
Case 6: 
Em. SortBySalary (); 
Case 7: 
return; 
} 
} 
} 
} 

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