全排列应用：输出子集

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public class Main {
    public static void main(String[] args) {
        String s = "12345";
        char[] c = s.toCharArray();
        for (int i = 0; i < c.length; i++) {
            char [] cc = new char[i+1];
            for (int j = 0; j < cc.length; j++) {
                cc[j] = c[j];
            }
            permutation(0,i,cc);
        }

    }

    private static void permutation(int left, int right, char[] c) {
        if(left == right){
            System.out.println(new String(c));
        }
        for (int i = left; i <= right ; i++) {
            swap(c,i,left);
            permutation(left+1,right,c);
            swap(c,i,left);
        }
    }

    private static void swap(char[] c, int left, int right) {
        char temp = c[left];
        c[left] = c[right];
        c[right] = temp;
    }

}