Reverse File Lines in Java: Explanation & Practice

Problem summary

Read a file and write lines in reverse order to a new file.

Starter code

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        // Read lines, reverse order, write to new file
        // Print reversed lines
    }
}

Expected output and test cases

• Reversed order

  Line 3
  Line 2
  Line 1

• Single line

  Only line

• ABC reversed

  C
  B
  A

Hints

1. Store all lines in ArrayList
2. Use Collections.reverse()
3. Write reversed list to file

Related File I/O exercises

• Practice Count Words in File in Java
• Practice Search in File in Java
• Practice Merge Multiple Files in Java

Practice all File I/O exercises · Run this idea in the Java compiler