The Java File class doesn’t provide any method to copy one file to another. However, we can use Java I/O Streams to read content from one file and write to another.

Example: Copy files using i/o streams

import java.io.FileInputStream;
import java.io.FileOutputStream;

class Main{
  public static void main(String[] args){

    byte[] array = new byte[50];
    try {
      FileInputStream sourceFile = new FileInputStream("input.txt");
      FileOutputStream destFile = new FileOutputStream("newFile");

      // reads all data from input.txt
      sourceFile.read(array);

      // writes all data to newFile
      destFile.write(array);
      System.out.println("The input.txt file is copied to newFile.");

      // closes the stream
      sourceFile.close();
      destFile.close();
    }
    catch (Exception e) {
      e.getStackTrace();
    }
  }
}

Output

The input.txt file is copied to newFile.

In the above example, we have used the FileInputStream and FileOutputStream to copy one file to another.

Here,

• FileInputStream reads all the content from input.txt to an array
• FileOutputStream writes all the content from the array to newFile

Note:

• The FileUtils class of org.apache.commons.io package provides the copyFile() method to copy the file.
• The Files class of java.nio package provides the copy() method to copy the file.