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import java.io.*; import java.util.*; public class Main { public static void main(String[] args) throws IOException { Scanner s=new Scanner(System.in); System.out.print("Enter String"); String st=s.next(); FileOutputStream fos=new FileOutputStream("abc.txt"); DataOutputStream dos=new DataOutputStream(fos); dos.writeBytes(st); } }In the above Example writeBytes method is to write the data into file.