java实现voctor按指定方式排序示例分享

import java.util.*;
class mycompare implements comparator //实现comparator，定义自己的比较方法
{
public int compare(object o1, object o2) {
elem e1=(elem)o1;
elem e2=(elem)o2;

if(e1.get() > e2.get())//这样比较是降序,如果把-1改成1就是升序.
{
   return -1;
}
else if(e1.get()<e2.get())
{
   return 1;
}
else
{
   return 0;
}
}
}
class elem {
private int ival;
public elem(int i) {
   this.ival = i;
}
public int get() {
   return this.ival;
}
}
public class vector1 {
public static void main(string[] args) {
   list v = new vector();
   v.add(new elem(1));
   v.add(new elem(22));
   v.add(new elem(3));
   v.add(new elem(14));
   comparator ct = new mycompare();
   collections.sort(v, ct);
   for (int i = 0; i < v.size(); i++)
    system.out.println(((elem) v.get(i)).get());
}
}