jodd-json/src/main/java/jodd/json/JsonWriter.java
protected void unicode(final char c) {
		write("\\u");
		int n = c;
		for (int i = 0; i < 4; ++i) {
			int digit = (n & 0xf000) >> 12;
			char hex = CharUtil.int2hex(digit);

			write(hex);

			n <<= 4;
		}
	}
protected void unicode(final char c) {
		write("\\u");
		int n = c;
		for (int i = 0; i < 4; ++i) {
			int digit = (n & 0xf000) >> 12;
			char hex = CharUtil.int2hex(digit);

			write(hex);

			n <<= 4;
		}
	}
Writes unicode representation of a character.