Go语言使用sort包对任意类型元素的集合进行排序的方法

// Len is the number of elements in the collection.  
Len() int  
// Less reports whether the element with  
// index i should sort before the element with index j.  
Less(i, j int) bool  
// Swap swaps the elements with indexes i and j.  
Swap(i, j int)

//对任意对象进行排序  
type Person struct {  
    name string  
    age  int  
}  
 
//为*Person添加String()方法，便于输出  
func (p *Person) String() string {  
    return fmt.Sprintf("( %s,%d )", p.name, p.age)  
}  
 
type PersonList []*Person  
 
//排序规则：首先按年龄排序（由小到大），年龄相同时按姓名进行排序（按字符串的自然顺序）  
 
func (list PersonList) Len() int {  
    return len(list)  
}  
 
func (list PersonList) Less(i, j int) bool {  
    if list[i].age < list[j].age {  
        return true  
    } else if list[i].age > list[j].age {  
        return false  
    } else {  
        return list[i].name < list[j].name  
    }  
}  
 
func (list PersonList) Swap(i, j int) {  
    var temp *Person = list[i]  
    list[i] = list[j]  
    list[j] = temp  
}  
 
func interfaceTest0203() {  
    fmt.Println("------")  
    p1 := &Person{"Tom", 19}  
    p2 := &Person{"Hanks", 19}  
    p3 := &Person{"Amy", 19}  
    p4 := &Person{"Tom", 20}  
    p5 := &Person{"Jogn", 21}  
    p6 := &Person{"Mike", 23}  
 
    pList := PersonList([]*Person{p1, p2, p3, p4, p5, p6})  
    sort.Sort(pList)  
    fmt.Println(pList)  
 
    /*output:  
    [( Amy,19 ) ( Hanks,19 ) ( Tom,19 ) ( Tom,20 ) ( Jogn,21 ) ( Mike,23 )] */  
}