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Date: Thu, 13 Dec 2012 11:41:03 -0800 (PST)
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Subject: Re: Unicode escapes and String literals?
From: Lew <lewbloch@gmail.com>
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Xref: csiph.com comp.lang.java.programmer:20297

Knute Johnson wrote:
> Thomas Richter wrote:
>> Knute Johnson wrote:
>>> I just had a great revelation as I was putting together my SSCCE for the
>>> question I was going to ask. So it has changed my question. How do I do
>>> the conversion of unicode [sic] escape sequences to a String that are done by
>>> string literals?

They aren't done by String literals.

>>> String s = "\u0066\u0065\u0064";
>>> becomes "fed" but if you create a String with \u0066\u0065\u0064 in it

Exactly how?

>>> without using the literal it stays \u0066\u0065\u0064. Is there a built
>>> in mechanism in Java for doing that translation to a String?

No.

>> Yes. It's called "compiler". The same part of the compiler that

That's not exactly correct, and it certainly is not the same part that translates '\t'.

>> translates a "\t" in a string literal to the TAB control character also
>> replaces the unicode sequences in the string literal to the
>> corresponding unicode encoding.

Nope.

> I want to be able to do it to a String not to a string literal.

You want to do what, exactly? I'm not clear on what you're trying to accomplish.

'\u' sequences are pre-compile, not during compile. Their presence is exactly equivalent 
to typing the corresponding Unicode character directly. 

You can embed them in identifiers, directives, anywhere the corresponding character can go.

Not just literals.

For that matter, you can use them in numeric literals.

<sscce>
package temp;

/**
 * ShowUnicodeEscapes.
 */
public class ShowUnicodeEscapes {

    static final \u0069nt COUN\u0054 = \u0030\u003b

    /**
     * main.
     * 
     * @param args String array of arguments.
     */
    public static void main(String[] args) {
        System.out.println("COUNT = \u0022+ COUNT);
    }
}
</sscce>