Some characters not showing up, but showing up as replacement character(Black diamond with question mark)

[nyhryan]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.94.0
• OS Version: Windows NT x64 10.0.19045 (Windows 10 Korean, 22H2)

Steps to Reproduce:

// Filename : Korean.java
import java.util.Scanner;

public class Korean {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String word = scanner.next();
        System.out.println("입력한 단어: " + word);
        scanner.close();
    }
}

I have simple Java program that prints Korean message and a word the user typed.

What I tried:

• With Windows Terminal app
  • with pwsh.exe : chcp 65001 && java Korean.java and type anything, will print properly.
  • with cmd.exe: chcp 65001 && java Korean.java and type anything. will print properly.
• In VS Code's integrated terminal
  • either powershell or cmd: chcp 65001 && java Korean.java and type anything, will not print properly.
  • even tested with all extensions disabled

I am not sure if this is Java's problem or VS code's problem since I have no idea how to test this in more general situation.

[nyhryan]

import java.io.UnsupportedEncodingException;
import java.util.Scanner;

public class Korean {
    private static void printBytes(byte[] str) {
        StringBuffer sb = new StringBuffer();
        for (byte s: str) {
            sb.append(String.format("\\x%02x ", s));
        }
        System.out.println(sb);
    }
    
    private static void printCodepoints(String str) {
        for (int i = 0; i < str.length(); i++) {
            System.out.printf("U+%04X ", str.codePointAt(i));
        }
        System.out.println();
    }

    public static void main(String[] args) throws UnsupportedEncodingException {
        Scanner sc = new Scanner(System.in);

        String str = sc.next();
        System.out.printf("String: %s\n", str);

        byte[] bytes = str.getBytes("UTF-8");
        printBytes(bytes);
        printCodepoints(str);

        sc.close();
    }
}

I have added some methods to print out bytes in hex and unicode code points.

I tried to print byte values and unicode code points of my input. here are comparison between windows terminal app and vs code. Above is Powershell in Windows terminall app, below is VS code's integrated terminal with Powershell.

[Tyriar]

If you use "terminal.integrated.experimental.windowsUseConptyDll": true this will probably fix your issue. There is a known issue with that setting where something an OpenConsole.exe process will hang around that you need to go kill in process manager. That's tracked in #225719 and #224488

[nyhryan]

Oh thank you! This whole conpty stuff is bit complex haha