练习-自定义比较规则实现类，实现排序

public class EmployeeManager3 {
 public List<Employee> emps=new ArrayList<Employee>();
 
 public static void main(String[] args) {
 EmployeeManager3 em=new EmployeeManager3();
 List<Employee> emps=em.getEmps();
 //调用排序方法1
 Collections.sort(emps, new EmpNoComparator());
 System.out.println("按照编号的排序如下：");
 for(Employee emp:emps){
 System.out.println(emp);
 }
 //调用排序方法2
 Collections.sort(emps, new EmpSalComparator());
 System.out.println("按照工资的排序如下：");
 for(Employee emp:emps){
 System.out.println(emp);
 }
 }
 
 public List<Employee> getEmps() {
 initEmps();
 return emps;
 }
 
 public void initEmps() {
 Employee emp=new Employee();
 emp.setEmpno("10006");
 emp.setName("Lucy");
 emp.setSalary(2000.0);
 emps.add(emp);
 emp=new Employee();
 emp.setEmpno("10002");
 emp.setName("HanMeimei");
 emp.setSalary(3000.0);
 emps.add(emp);
 emp=new Employee();
 emp.setEmpno("10003");
 emp.setName("Poly");
 emp.setSalary(3000.0);
 emps.add(emp);
 emp=new Employee();
 emp.setEmpno("10004");
 emp.setName("John");
 emp.setSalary(5000.0);
 emps.add(emp);
 emp=new Employee();
 emp.setEmpno("10005");
 emp.setName("Green");
 emp.setSalary(5000.0);
 emps.add(emp);
 }
}

public class Employee{
 private String empno;
 private String name;
 private Double salary;

public String getEmpno() {
 return empno;
 }

public void setEmpno(String empno) {
 this.empno = empno;
 }

public String getName() {
 return name;
 }

public void setName(String name) {
 this.name = name;
 }

public Double getSalary() {
 return salary;
 }

public void setSalary(Double salary) {
 this.salary = salary;
 }


@Override
 public String toString() {
 return empno+","+name+","+salary;
 }


}

public class EmpNoComparator implements Comparator<Employee>{

@Override
 public int compare(Employee e1,Employee e2) {
 return e1.getEmpno().compareTo(e2.getEmpno());
 }


}

public class EmpSalComparator implements Comparator<Employee>{

@Override
 public int compare(Employee e1,Employee e2) {
 return e1.getSalary().compareTo(e2.getSalary());
 }


}

按照编号的排序如下：
10002,HanMeimei,3000.0
10003,Poly,3000.0
10004,John,5000.0
10005,Green,5000.0
10006,Lucy,2000.0
按照工资的排序如下：
10006,Lucy,2000.0
10002,HanMeimei,3000.0
10003,Poly,3000.0
10004,John,5000.0
10005,Green,5000.0[/successbox]