Testing UTF-8 as a default output for Windows

Hello.java

class Hello {
    public static boolean ensureEncodingToUTF8() {
        String osEncoding = System.getProperty("file.encoding");
        if (!osEncoding.equals("UTF-8") || !osEncoding.equals("UTF8")) {
            java.lang.System.setProperty("file.encoding", "UTF-8");
            try {
                System.setOut(new java.io.PrintStream(System.out, true, "UTF-8"));
            } catch (Exception inner) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        ensureEncodingToUTF8();
        System.out.println("你好世界！");
    }
}

make_hello_jar.cmd

javac -J-Dfile.encoding=UTF-8 Hello.java && jar cvfe hello.jar Hello Hello.class && jar i hello.jar && java -jar hello.jar

make_hello_jar.sh

#!/bin/sh
javac Hello.java && jar cvfe hello.jar Hello Hello.class && jar i hello.jar && java -jar hello.jar

UnicodePrintStream.java

class UnicodePrintStream extends java.io.PrintStream {
    public UnicodePrintStream(java.io.OutputStream orig,
        java.nio.charset.Charset charset)
        throws java.io.UnsupportedEncodingException {
        super(orig, true, charset.name());
    }

    public java.io.OutputStream getOriginalStream() {
        return out;
    }
}