urut angka menggunakan java

Program :

import java.io.*;

class urut

{

            public static void main(String[]args)throws Exception

            {

                        DataInputStream key=new DataInputStream(System.in);

                        int[]data;

                        String st="";

                        int in=0,m=0;

                                                            {

                                                System.out.println("------------------------------------");

                                                System.out.println("Renza Bin Harnata");

                                                System.out.println("06.2009.1.05156");

                                                System.out.println("------------------------------------");

                                                System.out.println("\n") ;

                                                System.out.print("Masukkan jumlah data yang diinputkan : ");

                                                in=Integer.parseInt(key.readLine());

                                                {

                                                            data=new int[in];

                                                            for(int i=0;i<data.length;i++)

                                                            {

                                                                       

                                                                        {

                                                                                    System.out.print("inpukan bil. ke-"+(i+1)+" : ");

                                                                                    st=key.readLine();

                                                                                                                                                                        {

                                                                                                m=Integer.parseInt(st);

                                                                                               

                                                                                                if(m<0)

                                                                                                            System.out.println(st+" Tidak boleh negatif\n"+

                                                                                                                        "Ulangi kembali pengisian");

                                                                                                else

                                                                                                            data[i]=m;

                                                                                                                       

                                                                                                            }

                                                            System.out.print("\nData urut : ");

                                                            int bantu=0;

                                                            for (int i=0;i<data.length;i++)

                                                            {

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

                                                                        {

                                                                                    if (data[i]>data[j])

                                                                                    {

                                                                                                bantu=data[j];

                                                                                                data[j]=data[i];

                                                                                                data[i]=bantu;

                                                                                    }

                                                                        }

                                                                        System.out.print(" " +data[i] + " ");

                                                            }

                                                           

                                    }

                                   

                                    }

                        }

}