Printing out unicode from Java code issue in windows console

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I have got a problem with printing out a unicode symbol in the windows console.

Here's the java code that prints out the unicode symbol value; 

System.out.print("\u22A2 ");

The problem doesn't exist when I run the program in Eclipse with encoding settings as UTF-8, however when it comes to windows console the symbol gets replaced by a question mark.

The following was done to try overcome this problem, with no success;

  • Change the font of windows console to Lucida Console.

  • Every time I run windows console I will change the encoding settings, i.e. with the use of chcp 65001

An extra step I've tried a few times was running the java file with an argument, i.e. java -Dfile.encoding=UTF-8 Filter (where "Filter" is name of the class)

utf-8 cmd encoding unicode java
3 Answers

In additions to the steps you have taken, you also need a PrintStream/PrintWriter that encodes the printed characters to UTF-8.

Unfortunately, Java designers have chosen to open the standard streams with the so called "default" encoding, which is almost always unusable*) under Windows. Hence, using System.out and System.err naively will make your program output appear differently, depending on where you run it. This is straight against the goal: compile once, run anywhere.

*) It will be some non standard "code page" nobody except Microsoft recognizes on this planet. And AFAIK, if for example you have a German keyboard and a "German" OEM Windows and you want to have date and time in your home time zone, there is just no way to say: But I want UTF-8 input/output in my CMD window. This is one reason why I have my dual Ubuntu booted most of the time, where it goes without saying that the terminal does UTF-8.

The following usually works for me in JDK7:

public static PrintWriter stdout = new PrintWriter(
    new OutputStreamWriter(System.out, StandardCharsets.UTF_8),
    true);

For ancient Java versions, I replace StandardCharsets.UTF_8 by Charset.forName("UTF-8")

user_866040
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