*任意数字序列“123456”之类，输出它们所有的排列组合?

String str = "fkjav";

char[] arr1 = str.toCharArray();

char[] arr2 = java.util.Arrays.copyOf(arr1,arr1.length);

for(int i=0;i<arr1.length-1;i++)

{

for(int j = i+1;j<arr2.length;j++){

System.out.println(arr1[i] + "," + arr2[j]);

}

}