把一个数组里的数组合全部列出

package com.lk.B;

import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;

public class Test3 {

public static void main(String[] args) {
// TODO Auto-generated method stub
String [] array = new String[]{"1","2"};
listAll(Arrays.asList(array),"");
}

private static void listAll(List<String> candidate, String prefix) {
// TODO Auto-generated method stub
System.out.println(prefix);
for(int i = 0;i<candidate.size();i++){
List<String> temp = new LinkedList<>(candidate);
listAll(temp,prefix+temp.remove(i));
}
}

}

1
12
2
21