基本Q. [英] basic Q
问题描述
var myString = new String(" Hello world");
var myString =" Hello world" ;
两者没有区别吗?两者都创建了一个String obj
对吧?
var myString = new String("Hello world") ;
var myString = "Hello world" ;
There is NO difference between the two right ? both creates a String obj
right ?
推荐答案
Boobie写道:
var myString = new String(" Hello world");
var myString =" Hello world" ;
两者没有区别吗?
是的。
都创建一个String obj吧?
var myString = new String("Hello world") ;
var myString = "Hello world" ;
There is NO difference between the two right ?
Yes there is.
both creates a String obj right ?
第一个创建一个String对象并为该对象分配一个引用
到一个变量,第二个将一个字符串原始值赋给一个
变量。
Richard。
The first creates a String object and assigns a reference to that object
to a variable, the second assigns a string primitive value to a
variable.
Richard.
Richard Cornford写道:
Richard Cornford wrote:
Boobie写道:
Boobie wrote:
var myString = new String(" Hello world");
var myString =" Hello world" ;
两者没有区别吗?
var myString = new String("Hello world") ;
var myString = "Hello world" ;
There is NO difference between the two right ?
是的。
Yes there is.
两者都创建一个String obj吧?
both creates a String obj right ?
第一个创建一个String对象并将该对象的引用分配给一个变量,第二个将一个字符串原始值赋给一个<变量。
理查德。
The first creates a String object and assigns a reference to that object
to a variable, the second assigns a string primitive value to a
variable.
Richard.
这在实践中意味着什么?有性能考虑吗?
另外,当你使用第一种方法(new String(''Hello World''))时,会创建
一个字符串原语传递给String构造函数,
通过实际创建两个对象(即使原语只是临时(如果是)
)? />
Kevin N.
What does that mean in practice? Is there a performance consideration?
Also, when you use the first method (new String(''Hello World'')), does
that create a string primitive that is passed to the String constructor,
there by actually creating two objects (even if the primitive is only
temporary (if it is))?
Kevin N.
" Richard Cornford"
"Richard Cornford"
首先创建一个String对象并将该对象的引用分配给变量,第二个将字符串原始值赋给
变量。
The first creates a String object and assigns a reference to that object
to a variable, the second assigns a string primitive value to a
variable.
谢谢
所以当你(在什么情况下)使用一种形式与另一种形式时?
thanks
so when (under what circumstances) would you use one form vs the other ?
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