Know how to redirect input and output- and know how to append to an ex.docx
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This document provides a Java code snippet that demonstrates how to redirect input from a file named 'blah.txt' and append output to 'tylk.data'. It includes details on setting up file streams and reading lines from the input file to write them into the output file. Proper closing of the file streams is emphasized to prevent resource leaks.
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![Know how to redirect input and output, and know how to append to an existing file. Example:
run/usr/local/task with input redirected from blah.txt. and the output appended to file tylk.data
Solution
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
class Main {
public static void main(String[] args) throws IOException {
File dir = new File("run/user/local/task.");
String source = dir.getCanonicalPath() + File.separator + "blah.txt";
String dest = dir.getCanonicalPath() + File.separator + "tylk.data";
File fin = new File(source);
FileInputStream fis = new FileInputStream(fin);
BufferedReader in = new BufferedReader(new InputStreamReader(fis));
FileWriter fstream = new FileWriter(dest, true);](https://image.slidesharecdn.com/knowhowtoredirectinputandoutput-andknowhowtoappendtoanex-230204021955-95e1589b/85/Know-how-to-redirect-input-and-output-and-know-how-to-append-to-an-ex-docx-1-320.jpg)
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Know how to redirect input and output- and know how to append to an ex.docx
- 1. Know how to redirect input and output, and know how to append to an existing file. Example: run/usr/local/task with input redirected from blah.txt. and the output appended to file tylk.data Solution import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStreamReader; class Main { public static void main(String[] args) throws IOException { File dir = new File("run/user/local/task."); String source = dir.getCanonicalPath() + File.separator + "blah.txt"; String dest = dir.getCanonicalPath() + File.separator + "tylk.data"; File fin = new File(source); FileInputStream fis = new FileInputStream(fin); BufferedReader in = new BufferedReader(new InputStreamReader(fis)); FileWriter fstream = new FileWriter(dest, true);
- 2. BufferedWriter out = new BufferedWriter(fstream); String aLine = null; while ((aLine = in.readLine()) != null) { out.write(aLine); out.newLine(); } // do not forget to close the buffer reader in.close(); // close buffer writer out.close(); } }