Sixth annual Blue Bridge Cup Java question-nine array score

1,2,3...9 These nine numbers make up a fraction with a value of exactly 1/3, how does the group method work?

The code is as follows

/** * * @author Administrator * Class Name: Main * Creation time: 2015-5-1 * vesion1.0 */public class main{public static void Test (I                Nt[] x) {int a = x[0]*1000 + x[1]*100 + x[2]*10 + x[3];                                int b = x[4]*10000 + x[5]*1000 + x[6]*100 + x[7]*10 + x[8];        if (a*3==b) System.out.println (A + "" + B); } public static void F (int[] x, int k) {if (k>=x.length) {T                        EST (x);                Return                                } for (int i=k; i<x.length; i++) {{ int t=x[k]; X[k]=x[i];                        x[i]=t;                        } f (x,k+1);                        {int t=x[k]; x[k]=x[i]; x[i]=t; }}} public static void Main (string[] args) {int[] x = {        , 4,5,6,7,8,9};                        f (x,0); }}

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Sixth annual Blue Bridge Cup Java question-nine array score