Java自定义比较器Comparator

package com.sheepmu.text;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/*
* @author sheepmu
*/
public class HWCompetition {
public static void main(String[] args){
String s="0,1,2,3,4,5,6,7,8,9";
System.out.println(getSort(  s));//9 7 5 3 1 0 2 4 6 8
}
public static String getSort(String s){
List<Integer>list=new ArrayList<Integer>();
String[] ss=s.split(",");
for(int i=0;i<ss.length;i++){
list.add(Integer.parseInt(ss[i]+"") );
}
Collections.sort(list, new Comparator<Integer>(){

@Override
public int compare(Integer o1, Integer o2) {
int result=0;
if(o1%2==1&&o2%2==0){
result=o2%2- o1%2;//   结果为-才是前者在前
}
//				 if(o1%2==0&&o2%2==1){//和上面同样的作用
//					 result=o2%2- o1%2;//+
//				 }
if(o1%2==1&&o2%2==1){
result=o2-o1;//奇 降序
}
if(o1%2==0&&o2%2==0){
result= o1-o2;//偶 升序
}
return result;
}} );
StringBuffer sb=new StringBuffer();
for(int i:list){
sb.append(i+" ");
}
return sb.toString();
}
}

package com.sheepmu.text;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/*
* @author sheepmu
*/
public class HWCompetition {
public static void main(String[] args){
String[]  ss={"mail.sheepmu.com","sheepmu.com","hah.abc.org","cc.baidu.cn","bat.haha.ab"};
System.out.println(getSort(ss));
}
public static String getSort(String[] ss){
List<String>list=new ArrayList<String>();
for(int i=0;i<ss.length;i++){
list.add(ss[i]);
}
Collections.sort(list, new Comparator<String>(){
@Override
public int compare(String o1, String o2) {
String[] ss1=o1.split("\\.");
String[] ss2=o2.split("\\.");
System.out.println(Arrays.toString(ss1)+"  和   "+Arrays.toString(ss2) );
int len=ss1.length<=ss2.length? ss1.length:ss2.length;//一定不要忘了等号，不然长度等的情况就悲剧了。循环比较时以短的为标准
int j=0;
for(;j<len;j++){
if(!ss1[ss1.length-1-j].equals(ss2[ss2.length-1-j])){
System.out.println("  -某段不等-------->" );
return ss1[ss1.length-1-j].compareTo(ss2[ss2.length-1-j]);
}
}
if(j==len){//循环完了
System.out.println("  -循环完了-------->"+len);
return o1.length()-o2.length();
}
return 0;
}} );
StringBuffer sb=new StringBuffer();
for(String i:list){
sb.append(i+"              ");
}
return sb.toString();
}
}