Java Identifier & Keyword

identifier -> name of a variable, a method, or a class
keyword -> CANNOT be used as an identifier

identifier 的4種組成:

1. letter, A-Za-z
2. currency character, $
3. underscore, _
4. number, 0-9

• 前3種可以做為 identifier的開頭, 第4種 number[0-9] 不可放在 identifier 的第1個位置.
• 長度沒有限制
• case-sensitive

Legal:

• int _a;
• int $c;
• int ______2_w;
• int _$;
• int this_is_a_very_detailed_name_for_an_identifier;

Illegal:

• int :b;
• int -d;
• int e#;
• int .f;
• int 7g;

keyword 有50個:

ToWriteList

1. java string constant/literal pool
• String str = new String("abc"); 幾個 ojbects 會被產生?
2. throw Exception, SecurityException, Throwable while method does not have thows declaration
• 原本的 method 沒有寫要 thows Exception, 但為何可以 thow SecurityException?
• 而且~~為何不能 thow Throwable?
3. Eclipse will generate strange byte code that will call Display.getHeight() but not Canvas.getHeight()
• try to reproduce this first!
4. 
   

語文練習

這週來了位外國同事~
同樣是台灣出生~卻不太會中文~
聽說是來一年~為了學中文!

staff travel: 員工旅遊
bargain: noun 減價品, 便宜貨           verb 討價還價, 殺價?

Linking error LNK2019 in MSVC, unresolved symbols with __imp__ prefix, but should be from static lib.

Linking error LNK2019 in MSVC, unresolved symbols with __imp__ prefix, but should be from static lib.