java对象数组排序

最新推荐文章于 2024-07-31 10:07:20 发布

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最新推荐文章于 2024-07-31 10:07:20 发布

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本文通过一个Java示例程序展示了如何对Employee对象数组进行排序，并附带了对数组和列表不同排序方式的注释说明。代码实现了自定义Employee类并重写了compareTo方法来按工资高低排序员工。

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Test
{
public static void main(String[] args)
{
   Employee[] staff = new Employee[5];
   staff[0] = new Employee("Harry Hacker", 35000);
   staff[1] = new Employee("Carl Cracker", 75000);
   staff[2] = new Employee("Tony Tester", 38000);
   staff[3] = new Employee("Owen Leader", 95000);
   staff[4] = new Employee("GOGO dustman", 4000);
   /*List<Employee> list=new ArrayList<Employee>();
   list.add(new Employee("alvin",9999));
   list.add(new Employee("Harry Hacker",35000));
   list.add(new Employee("Cracker Hacker",75000));
   list.add(new Employee("Owen Hacker",95000));
   list.add(new Employee("GOGO Hacker",4000));
   Arrays.sort(list.toArray());*/
Array.sort(staff);//只能排列 数组->[]  不能排列 集合->List
   for (Employee e : staff)
   {
    System.out.println("name=" + e.getName() + ", salary=" + e.getSalary());
   }
   int[] array = new int[] { 5, 4, 8, 2, 7, 3, 1, 6 };
   Arrays.sort(array);
   for (int i : array)
   {
    System.out.println(i);
   }
}
}

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 int compareTo(Employee other)
{
   if (salary < other.salary)
   {
    return -1;
   }
   if (salary > other.salary)
   {
    return 1;
   }
   return 0;
}

private String name;
private double salary;
}

/*
输出结果如下：
name=GOGO dustman, salary=4000.0
name=Harry Hacker, salary=35000.0
name=Tony Tester, salary=38000.0
name=Carl Cracker, salary=75000.0
name=Owen Leader, salary=95000.0
1
2
3
4
5
6
7
8
*/