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這是SUN JVM特有的一個問題, SUN JVM用一個叫做permanent generation的內存區域內來存放classloader載入的class,method之類的object, 而普通object則是放到heap里.
IBM JVM則是把class和object都統一放到heap里，所以如果程序比較大的話,用IBM JVM更好一些，不需要調優就能更充分的利用內存空間。

re: 幾種javascript的改進寫法[未登錄] ke 2007-11-25 21:58

@我為J狂
I don't quite aggree on the 1st rule, there are advice on this problem in mozilla.
http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Statements:for...in
"Although it may be tempting to use this as a way to iterate over an Array, this is a bad idea. The for...in statement iterates over user-defined properties in addition to the array elements, so if you modify the array's non-integer or non-positive properties (e.g. by adding a "foo" property to it or even by adding a method or property to Array.prototype), the for...in statement will return the name of your user-defined properties in addition to the numeric indexes. Also, because order of iteration is arbitrary, iterating over an array may not visit elements in numeric order. Thus it is better to use a traditional for loop with a numeric index when iterating over arrays."

re: 幾種javascript的改進寫法[未登錄] ke 2007-11-25 21:54

The fifth one, I tested your code in FF2 and IE7, both alert "12".

var str="Java我選擇，我喜歡！";
var charLength=str.length;

May be there are problem in lower version.

re: 幾種javascript的改進寫法[未登錄] ke 2007-11-25 21:48

For the first rule, it is a tirck, ARRAY IS KIND OF OBJECT

var arr = [];
arr[-1]=-1;//add an property named "-1" on arr OBJECT
arr[1]=1; //put a value whose index is 1 into arr ARRAY
for(var k in arr)alert("arr[" + k + "]=" + arr[k]);
alert("length = " + arr.length);
for(var i=0;i<arr.length;i++)alert("arr[" + i + "]=" +arr[i]);

re: 幾種javascript的改進寫法[未登錄] ke 2007-11-25 21:31

Don't aggree on the third rule, closure can provide better encapsulation.
The rule should be use closure to support private properties when possible.
function Person(name,sex)
{
var action='run';//private property
this.run=function(){//public method
alert(action);
};
}

re: 某一會員的JAVA書籍 KE 2007-10-29 10:17

學習JAVA確實是如此啊,感覺自己上了大學,學了JAVA后,所看的書比未上大學之前所看的課外書要多得多,以前很少看書的除了課本,呵呵

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