Java中简单的排列组合

从n个字符中，任意取出两个进行排列组合。

package mypackage;public class Test {    public static void main(String[] args) {        String[] elements = { "a", "b", "c","d","e","f","g","h"};        int index=0;        for(int i=0;i<elements.length;i++){            for(int j=0;j<elements.length;j++){            if(i==j){            continue;            }                index++;                System.out.println(index+"."+elements[i]+elements[j]);            }        }    }}