public class DataSorter {public static void sort(A a){}public static void sort(B a){}public static void sort(C c){}//...................
}

public class DataSorter {public static void sort(Comparable [] a) {int index;                            //保存每次比较,最大值的下标;for(int i = 1; i < a.length; i++){    //控制外循环次数index = 0;for(int j = 1; j <= a.length - i ; j++){if(a[j].compareTo(a[index]) == 1){index = j;}}swap(a, index, a.length -i);}}private static void swap(Comparable[] a, int x, int y) {Comparable tmp = a[x];a[x] = a[y];a[y] = tmp;}//输出数组元素public static void show(Comparable[] a) {for(int i = 0; i < a.length; i++){System.out.println(a[i]);}}}

public interface Comparable<T> {public int compareTo(T o);
}

public class Teacher implements Comparable<Teacher> {private int title;public Teacher(int title) {super();this.title = title;}public int getTitle() {return title;}public void setTitle(int title) {this.title = title;}@Overridepublic int compareTo(Teacher o) {if(this.title > o.getTitle()){return 1;}else if(this.title == o.getTitle()){return 0;}else{return -1;}}@Overridepublic String toString() {return "teacher--" +title+" ";}
}

public class Student implements Comparable<Student> {private int mark;public int getMark() {return mark;}public void setMark(int mark) {this.mark = mark;}public Student(int mark) {super();this.mark = mark;}@Overridepublic String toString() {return "student" +mark+" ";}@Overridepublic int compareTo(Student o) {if(this.mark > o.getMark()){return 1;}else if(this.mark == o.getMark()){return 0;}else{return -1;}}
}

public class Test {public static void main(String[] args) {//int [] a = {9,2,1,8,0,3};Student [] ss = {new Student(59),new Student(30),new Student(90)};DataSorter.sort(ss);DataSorter.show(ss);Teacher [] ts = {new Teacher(10),new Teacher(3),new Teacher(12)};DataSorter.sort(ts);DataSorter.show(ts);}}