java輸入一個字符串，輸出該字符串的所有的排序

public class Sort {

        public static void arrangeSequence(char[] strArr,int i){
            char temp;
            ArrayList<String> list = new ArrayList<>();
            if(strArr == null || i> strArr.length|| i<0){
                return;
            }
            else if(i == strArr.length){
                //將得到的組合存進ArrayList中
                list.add(String.valueOf(strArr));
            }
            else{
                for(int j=i;j<strArr.length;j++){
                    temp = strArr[j];
                    strArr[j] = strArr[i];
                    strArr[i] = temp;
                    //遞歸調用
                    arrangeSequence(strArr,i+1);
                    temp = strArr[j];
                    strArr[j] = strArr[i];
                    strArr[i] = temp;
                }
            }
            for(int m=0;m<list.size();m++){
                System.out.println(list.get(m));
            }
        }
        public static void main(String[] args) {
            System.out.println("請輸入字符串：");
            Scanner sc = new Scanner(System.in);
            String str = sc.nextLine();
            str = str.replaceAll(" ","");
            char strArr[] = str.toCharArray();
            Arrays.sort(strArr);
            arrangeSequence(strArr,0);
        }
    }