This topic is about Java 12 – File mismatch method.
Java 12 introduces an easy way to compare two files using following syntax −
public 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;
public class APITester {
public static void main(String[] args) throws IOException {
Path path1 = Files.createTempFile("file1", ".txt");
Path path2 = Files.createTempFile("file2", ".txt");
Files.writeString(path1, "Adglob");
Files.writeString(path2, "Adglob");
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, "Adglob 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
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