Java Encoding issue

Question

When defining the below string on Java JDK 9 String s = "एक गाव में एक किसान" It throws the following error: Unmappable character (0xE0) for encoding US-ASCII I understand that it is UTF-8 encoded but as JDK 9 has default charset set as US-ASCII but I can't find how to change the default charset to UTF-8 from the code itself?

Does this answer your question? Setting the default Java character encoding — Gatusko
– Gatusko, Commented Dec 4, 2019 at 18:29
No, I want to change the default charset from within the code — A.Raw
– A.Raw, Commented Dec 4, 2019 at 18:39
Unfortunately, the file.encoding property has to be specified as the JVM starts up It is in the answer — Gatusko
– Gatusko, Commented Dec 4, 2019 at 18:57
is there anyway that i take user input in bytes and convert into string with utf-8 format? — A.Raw
– A.Raw, Commented Dec 4, 2019 at 19:19
There are 2 different issues: encoding of sources and encoding for IO operations in your code. When you have written some .java files in non-default encoding,you have to say java compiler what encoding it should use to read the sources to parse them correctly. The second issue is how you read/write data in your code. It also uses default encoding, but there is a lot of specific methods to read/write data using encoding explicitly like: InputStreamReader(InputStream in,String charsetName), OutputStreamWriter(OutputStream out,String charsetName), String(byte[] bytes, String charsetName)etc. — AnatolyG
– AnatolyG, Commented Dec 4, 2019 at 21:25

Andreas · Accepted Answer · 2019-12-04 20:17:25Z

3

I want to change the default charset from within the code

Impossible¹.

The source code is just text, it doesn't define the encoding used to store that text.

You can however decide that your source code is US-ASCII, so the encoding doesn't matter (excl. UTF-16, UTF-32, etc), by specifying all non-ASCII characters as Unicode escapes:

String s = "\u090f\u0915 \u0917\u093e\u0935 \u092e\u0947\u0902 \u090f\u0915 \u0915\u093f\u0938\u093e\u0928"

Of course, it makes it difficult to know what the string says.

^{1) Since Java doesn't support BOM's.}

answered Dec 4, 2019 at 20:17

Andreas

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