Store some number in a file in java

import java.io.*; class file { public static void main(String args[])throws IOException { System.out.println("How many number you want to store:"); BufferedReader in=new BufferedReader(new InputStreamReader(System.in)); //DataInputStream in=new DataInputStream(System.in); int n=Integer.parseInt(in.readLine()); int a[]=new int[10]; System.out.println("Enter your number"); for(int i=0;i { System.out.printf("The number a[%d]=",i+1); a[i]=Integer.parseInt(in.readLine()); } FileOutputStream fs=new FileOutputStream("test.java"); DataOutputStream ds=new DataOutputStream(fs); for(int i=0;i { ds.writeInt(a[i]); } FileInputStream fi=new FileInputStream ("test.java"); DataInputStream di=new DataInputStream (fi); for(int j=0;j { a[j]=di.readInt(); } for(int i=0;i { for(int j=i+1;j { if(a[i] { int change=a[i]; a[i]=a[j]; a[j]=change; } } } System.out.println("Sorted list"); for(int i=0;i { System.out.printf("The number a[%d]=",i+1); System.out.println(a[i]); } System.out.println(); di.close(); } }