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tiantian911
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java-review-structure

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2008年4月17日 20:50:13
強類型,ruby,python是弱類型
沒有強制類型轉換,Integer j = 1.1; 是錯誤的!
八種基本,八種包裹:wrapped
int-4 short-2 long-8 float-4 double-8 char boolean byte-1
Integer Short Long Float Double Character Boolean Byte
基本數據類型為什么不是對象?是因為降低開銷么?

unicode,前127個跟ascii一樣,有65536個字符
char 16位unicode,2個字節

與平臺無關。增強可移植性。
定義時變量被初始化為適當的“0”


java的全局只能是類,外部的作用域定義了變量,則內部不能夠定義。

java運算一律從左到右。

2008年4月17日 21:04:23
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