list java中List對象通用排序算法

/**
 * 學生實體類
 * @author chenchuang
 *
 */
public class Student {
    public Student(int id, String name, int age) {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }

    private int id;
    private String name;
    private int age;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

                                工具類：

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * List對象排序的通用方法
 * 
 * @author chenchuang
 * 
 * @param <E>
 */
public class ListSort<E> {
    /**
     * 
     * @param list 要排序的集合
     * @param method 要排序的實體的屬性所對應的get方法
     * @param sort desc 為正序  
     */
    public void Sort(List<E> list, final String method, final String sort) {
        // 用內部類實現排序
        Collections.sort(list, new Comparator<E>() {

            public int compare(E a, E b) {
                int ret = 0;
                try {
                    // 獲取m1的方法名
                    Method m1 = a.getClass().getMethod(method, null);
                    // 獲取m2的方法名
                    Method m2 = b.getClass().getMethod(method, null);

                    if (sort != null && "desc".equals(sort)) {

                        ret = m2.invoke(((E)b), null).toString().compareTo(m1.invoke(((E)a),null).toString());

                    } else {
                        // 正序排序
                        ret = m1.invoke(((E)a), null).toString().compareTo(m2.invoke(((E)b), null).toString());
                    }
                } catch (NoSuchMethodException ne) {
                    System.out.println(ne);
                } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return ret;
            }
        });
    }
}

                                測試類：

import java.util.ArrayList;

public class ListTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        ArrayList<Student> list= new ArrayList<Student>();
        list.add(new Student(1,"張三",5));
        list.add(new Student(2,"李四",4));
        list.add(new Student(3,"王五",3));
        list.add(new Student(4,"小明",2));
        list.add(new Student(5,"小黑",1));
        ListSort<Student> listSort= new ListSort<Student>();
        listSort.Sort(list, "getAge", "desc");
        for(Student s:list){
            System.out.println(s.getId()+s.getName()+s.getAge());
        }

    }

}

                                測試結果

1張三5
2李四4
3王五3
4小明2
5小黑1