Archive for August, 2004

Reglan For Sale

Reglan For Sale, These days, when I'm reading some other guy's code, I encounter some problem. Reglan pictures, In these code, I can read following codes:

[code lang="java"]
JButton button = new JButton("OK");
....., order Reglan no prescription. Reglan interactions, actionPerformed(e) {
String s = e.getActionCommand();

Look, Reglan canada, mexico, india, Reglan pharmacy, it use "==" but not "equals" here. "Oh, Reglan treatment, Is Reglan safe, it must be a bug!", I told myself, generic Reglan. But, wait, when I excuted the program, it worked quite well, Reglan For Sale. Get Reglan, And till this moment, I remembered, Reglan dose, Where can i find Reglan online, current powerful JVM will maintain a constant pool for String, so maybe two "OK" will reference the same place, what is Reglan. Real brand Reglan online, So, such mechanism will work, Reglan no prescription. Reglan schedule,

But, does Java Language Specification has such standard, where can i buy cheapest Reglan online. Where to buy Reglan, and all JVM will follow this standard. I continue to dig into it.

Reglan For Sale, First, I found such item in JLS 3.10.5 -- String literals.

Abstract some points here:

Literal strings within the same class ($8) in the same package ($7) represent references to the same String object ($4.3.1).

Literal strings within different classes in the same package represent references to the same String object.

Literal strings within different classes in different packages likewise represent references to the same String object.

Strings computed by constant expressions ($15.28) are computed at compile time and then treated as if they were literals.

Strings computed at run time are newly created and therefore distinct.

The result of explicitly interning a computed string is the same string as any pre-existing literal string with the same contents, Reglan description. Reglan forum,

So, this is the feature of String class, Reglan steet value, Reglan long term, every JVM should follow. And, effects of Reglan, Reglan photos, when I read the code of, I found such comments in method "intern".

public String intern()

Returns a canonical representation for the string object.

A pool of strings, Reglan without prescription, Buy no prescription Reglan online, initially empty, is maintained privately by the class String.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~So good:-)

When the intern method is invoked, about Reglan, Reglan pics, if the pool already contains a string equal to this String object as determined by the equals(Object) method, then the string from the pool is returned, Reglan australia, uk, us, usa. Purchase Reglan online no prescription, Otherwise, this String object is added to the pool and a reference to this String object is returned.

It follows that for any two strings s and t, Reglan from canadian pharmacy, Reglan dangers, s.intern() == t.intern() is true if and only if s.equals(t) is true.

All literal strings and string-valued constant expressions are interned. String literals are defined in $3.10.5 of the Java Language Specification.

It's quite clear about the case I encountered, Reglan For Sale. Then I understand, Reglan duration, Buy Reglan no prescription, this is not a bug, but the trick :P, buy Reglan from mexico. Reglan samples, But, why he use "==" but not "equals", I think that will be more clear and more easy to read, I think there must be other guys to be puzzled as me :-).

I think the author must care more about the performance than the code, the performance of "==" sure if better than "equals", especially when the String is long~.

Ok, everything clear now, and sure, not only String has such pool. For example:

[code lang="java"]
Integer i = 1;
Integer j = 1;

what will System.out.println(i==l) output. I think you can get the right answer. :P

Update (2005.11.09):

"String"'s method "equalsIgnoreCase" also take advantage of this string pool:

[code lang="java"]
public boolean equalsIgnoreCase(String anotherString) {
return (this == anotherString) . true :
(anotherString != null) && (anotherString.count == count) &&
regionMatches(true, 0, anotherString, 0, count);

If the two string point the same one, simply return true.

So, if you need to compare Strings frequently, you should "Intern" them.

For example, in Lucene's source code, you need to compare the Field name very often, so, they intern the field name.

[code lang="java"] = name.intern(); // field names are interned
[/code] .

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