Collections.sort排序小經典

import java.util.*;
import java.text.*;

public class A {

    static void sortanon(List list) {
        Collections.sort(list, new Comparator() {
            public int compare(
               Object o1, Object o2) {
                int index1;
                int index2;
                int index3;
                int index4;
                index1 = (((String[])o1)[0]).compareTo(((String[])o2)[0]);
                if (index1 == 0) {
                    index2 = (((String[])o1)[1]).compareTo(((String[])o2)[1]);
                    if (index2 == 0) {
                        index3 = (((String[])o1)[2]).compareTo(((String[])o2)[2]);
                        if (index3 == 0) {
                            index4 = (((String[])o1)[3]).compareTo(((String[])o2)[3]);
                            return index4;
                        } else {
                            return index3;
                        }
                    } else {
                        return index2;
                    }
                } else {
                    return index1;
                }
            }
        });
    }

    public static void main(String[] args) throws Exception {
        String[] s = new String[4];
        ArrayList list = new ArrayList();
        s[0] = "6";
        s[1] = "2";
        s[2] = "7";
        s[3] = "0";
        list.add(s);

        s = new String[4];
        s[0] = "4";
        s[1] = "3";
        s[2] = "9";
        s[3] = "6";
        list.add(s);

        s = new String[4];
        s[0] = "4";
        s[1] = "4";
        s[2] = "4";
        s[3] = "4";
        list.add(s);

        s = new String[4];
        s[0] = "4";
        s[1] = "3";
        s[2] = "9";
        s[3] = "5";
        list.add(s);

        s = new String[4];
        s[0] = "4";
        s[1] = "3";
        s[2] = "9";
        s[3] = "3";
        list.add(s);

        sortanon(list);
       

        for (int i = 0; i < list.size(); i++) {
            String[] t = (String[])list.get(i);
            System.out.println("-------------------------------------");
            for (int j = 0; j < t.length; j++) {
                System.out.println("****" + j + ":[" + t[j] + "]");
            }
        }
    }

}