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]);
}
}
}
}