求大虾看看这个例子。
例子中已经使用sort()进行升序排列了。
那么,下面的compareTo()声明又是干什么用的呢?
菜鸟出来,请大虾们多多指教。/**
@version 1.30 2004-02-27
@author Cay Horstmann
*/import java.util.*;public class EmployeeSortTest
{
public static void main(String[] args)
{
Employee[] staff = new Employee[3]; staff[0] = new Employee("Harry Hacker", 35000);
staff[1] = new Employee("Carl Cracker", 75000);
staff[2] = new Employee("Tony Tester", 38000); Arrays.sort(staff); // print out information about all Employee objects
for (Employee e : staff)
System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());
}
}class Employee implements Comparable<Employee>
{
public Employee(String n, double s)
{
name = n;
salary = s;
} public String getName()
{
return name;
} public double getSalary()
{
return salary;
} public void raiseSalary(double byPercent)
{
double raise = salary * byPercent / 100;
salary += raise;
} /**
Compares employees by salary
@param other another Employee object
@return a negative value if this employee has a lower
salary than otherObject, 0 if the salaries are the same,
a positive value otherwise
*/
public int compareTo(Employee other)
{
if (salary < other.salary) return -1;
if (salary > other.salary) return 1;
return 0;
} private String name;
private double salary;
}
例子中已经使用sort()进行升序排列了。
那么,下面的compareTo()声明又是干什么用的呢?
菜鸟出来,请大虾们多多指教。/**
@version 1.30 2004-02-27
@author Cay Horstmann
*/import java.util.*;public class EmployeeSortTest
{
public static void main(String[] args)
{
Employee[] staff = new Employee[3]; staff[0] = new Employee("Harry Hacker", 35000);
staff[1] = new Employee("Carl Cracker", 75000);
staff[2] = new Employee("Tony Tester", 38000); Arrays.sort(staff); // print out information about all Employee objects
for (Employee e : staff)
System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());
}
}class Employee implements Comparable<Employee>
{
public Employee(String n, double s)
{
name = n;
salary = s;
} public String getName()
{
return name;
} public double getSalary()
{
return salary;
} public void raiseSalary(double byPercent)
{
double raise = salary * byPercent / 100;
salary += raise;
} /**
Compares employees by salary
@param other another Employee object
@return a negative value if this employee has a lower
salary than otherObject, 0 if the salaries are the same,
a positive value otherwise
*/
public int compareTo(Employee other)
{
if (salary < other.salary) return -1;
if (salary > other.salary) return 1;
return 0;
} private String name;
private double salary;
}
呵呵舒舒服服地帮"gaigai22(耷耷)"顶一下
please..please...
如果返回正值表示:this>other
如果返回负值表示:this<other
如果返回零表示:this==other