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Read Input From User and Write to File

import java.io.BufferedWriter; import java.io.FileWriter; import java.io.InputStream; public class Main {   public static void main(String[] args) throws Exception {     InputStream in = System.in;     BufferedWriter bw = new BufferedWriter(new FileWriter("output.txt"));     int letter;     while ((letter = in.read()) != -1) {       bw.write((char) letter);       bw.flush();     }   } }