How to write unicode cross symbol in Java?

问题

I'm trying to write this unicode cross symbol (𐀵) in Java:

class A {
    public static void main(String[] args) {
        System.out.println("\u2300");
        System.out.println("\u10035");
    }
}

I can write o with a line through it (⌀) just fine, but the cross symbol doesn't show up, instead it just prints the number 5:

# javac A.java && java A
⌀
ဃ5

Why?

回答1:

You're looking for U+10035, which is outside the Basic Multilingual Plane. That means you can't use \u to specify the value, as that only deals with U+0000 to U+FFFF - there are always exactly four hex digits after \u. So currently you've got U+1003 ("MYANMAR LETTER GHA") followed by '5'.

Unfortunately Java doesn't provide a string literal form which makes characters outside the BMP simple to express. The only way of including it in a literal (but still in ASCII) is to use the UTF-16 surrogate pair form:

String cross = "\ud800\udc35";

Alternatively, you could use the 32-bit code point form as an int:

String cross = new String(new int[] { 0x10035 }, 0, 1);

(These two strings are equal.)

Having said all that, your console would still need to support that character - you'll need to try it to find out whether or not it does.

回答2:

I believe Java represents Unicode characters from 0x0000 to 0xFFFF. Java would evaluate "\u10035" to whatever "\u1003" is and a 5 after that.

回答3:

0x10035 is a supplemental Unicode character. You'll need to font that supports it if you want your program to render it.

http://www.oracle.com/technetwork/articles/javase/supplementary-142654.html

回答4:

Unicode escapes are 4 characters long. You are printing \u1003 followed by '5'. Are you sure you have the right code point?

来源：https://stackoverflow.com/questions/16616162/how-to-write-unicode-cross-symbol-in-java