package trenator.basic2;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Comparator;
public class CompareDemo {
/*
* comparable接口的使用方法
*/
public static void main(String[] args){
int a="Tom".compareTo("Tom");//比较第一个字母
System.out.println("a="+a);
/////////////////////////////////////
List<String> names=new ArrayList<String>();
names.add("Tom");
names.add("Jerry");
names.add("Black");
names.add("Andy");
names.add("Lee");
System.out.println(names);
// Collections.sort(names); //排序1
Bylength comparator=new Bylength();
Collections.sort(names,comparator);//排序2
System.out.println(names);
}
}
class Bylength implements Comparator<String>{
public int compare(String str1,String str2){
return str1.length()-str2.length();
}
}