how can i change bytes of string that look the same

Question

I want to check file name length

When i check the length of file name I got from mac is different from the length of the name I typed in IDE(Intellij).

So, I took the bytes of the string and printed it to the console, but it was different. The case I want is the length as if i typed in IDE. Is this possible?
How can i change the java bytes of string from macString to IDEString

import java.nio.charset.StandardCharsets;

public class Main {
    public static void main(String[] args) {
        String fileNameFromMac = "스크린샷.png";
        String typedInIDE = "스크린샷.png";

        System.out.println("File Name From Mac Length : " + fileNameFromMac.length());
        System.out.println("typedInIDE : " + typedInIDE.length());

        byte[] fileNameFromMacBytes = fileNameFromMac.getBytes(StandardCharsets.UTF_8);
        byte[] typedInIDEBytes = typedInIDE.getBytes(StandardCharsets.UTF_8);

        for(byte b : fileNameFromMacBytes) {
            System.out.print(b);
        }
        System.out.println();
        for(byte b : typedInIDEBytes) {
            System.out.print(b);
        }
    }
}

enter image description here

user_3558960 · Answer

It's a difference in Unicode normalization. After normalizing to the same form, they will both have the same length (and the same bytes):

import java.text.Normalizer;

public class Main {
    public static void main(String[] args) {
        String fromMac = "스크린샷.png";
        String fromIDE = "스크린샷.png";

        System.out.println("From Mac length: " + fromMac.length());
        System.out.println("From IDE length: " + fromIDE.length());

        String normFromMac = Normalizer.normalize(fromMac, Normalizer.Form.NFD);
        String normFromIDE = Normalizer.normalize(fromIDE, Normalizer.Form.NFD);

        System.out.println("Normalized from Mac length: " + normFromMac.length());
        System.out.println("Normalized from IDE length: " + normFromIDE.length());
    }
}

This yields the following output:

From Mac length: 14
From IDE length: 8
Normalized from Mac length: 14
Normalized from IDE length: 14

See the Oracle Java Tutorial for more information.

how can i change bytes of string that look the same

1 Answers