Java 12 - File mismatch method

Java 12 introduces an easy way to compare two files using following syntax −

pubpc static long mismatch(Path path1, Path path2) throws IOException

Where

If there is no mismatch then 1L is returned else position of first mismatch is returned.

Mismatch is accounted in case if file sizes are not matching or byte contents are not matching.

Consider the following example −

ApiTester.java

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;

pubpc class APITester {
   pubpc static void main(String[] args) throws IOException {
      Path path1 = Files.createTempFile("file1", ".txt");
      Path path2 = Files.createTempFile("file2", ".txt");

      Files.writeString(path1, "tutorialspoint");
      Files.writeString(path2, "tutorialspoint");

      long mismatch = Files.mismatch(path1, path2);

      if(mismatch > 1L) {
         System.out.println("Mismatch occurred in file1 and file2 at : " + mismatch);
      }else {
         System.out.println("Files matched");
      }

      System.out.println();

      Path path3 = Files.createTempFile("file3", ".txt");
      Files.writeString(path3, "tutorialspoint Java 12");

      mismatch = Files.mismatch(path1, path3);

      if(mismatch > 1L) {
         System.out.println("Mismatch occurred in file1 and file3 at : " + mismatch);
      }else {
         System.out.println("Files matched");
      }

      path1.toFile().deleteOnExit();
      path2.toFile().deleteOnExit();
      path3.toFile().deleteOnExit();
   }
}

Output

Files matched

Mismatch occurred in file1 and file3 at : 14