Store some number in a file and sorted them in java.

import java.io.*; class filetest { public static void main(String args[])throws IOException { System.out.print("Enter your number="); BufferedReader ob=new BufferedReader(new InputStreamReader(System.in)); int n=Integer.parseInt(ob.readLine()); int a[]=new int[n+1]; System.out.println("Enter your input number "); for(int i=1;i<=n;i++) { System.out.printf("Enter your number[%d]=",i); a[i]=Integer.parseInt(ob.readLine()); } FileOutputStream fs=new FileOutputStream("test.java"); DataOutputStream ds=new DataOutputStream(fs); for(int j=1;j<=n;j++) { ds.writeInt(a[j]); } FileInputStream fi=new FileInputStream("test.java"); DataInputStream di=new DataInputStream(fi); for(int i=1;i<=n;i++) { a[i]=di.readInt(); } System.out.println("Your sorted list"); for(int i=1;i<=n;i++) { for(int j=i+1;j<=n;j++) { if(a[i] { int cd=a[i]; a[i]=a[j]; a[j]=cd; } } } for(int i=1;i<=n;i++) { System.out.printf("Your number[%d]is=:",i); System.out.println(a[i]); } System.out.println(); di.close(); } } To download the program click here: filetest.java