{"id":2436,"date":"2016-05-23T02:00:31","date_gmt":"2016-05-22T18:00:31","guid":{"rendered":"http:\/\/itteacheritfreelance.hk\/test\/wordpress\/?p=2436"},"modified":"2016-05-23T02:00:31","modified_gmt":"2016-05-22T18:00:31","slug":"java-%e8%a3%9c%e7%bf%92-java-%e9%9b%bb%e8%85%a6%e8%a3%9c%e7%bf%92%e7%8f%ad-java-1-%e5%b0%8d-1-%e7%a7%81%e4%ba%ba%e8%a3%9c%e7%bf%92-%e7%ac%ac%e4%b8%80%e7%ab%a0","status":"publish","type":"post","link":"https:\/\/itteacheritfreelance.hk\/test\/wordpress\/2016\/05\/23\/java-%e8%a3%9c%e7%bf%92-java-%e9%9b%bb%e8%85%a6%e8%a3%9c%e7%bf%92%e7%8f%ad-java-1-%e5%b0%8d-1-%e7%a7%81%e4%ba%ba%e8%a3%9c%e7%bf%92-%e7%ac%ac%e4%b8%80%e7%ab%a0\/","title":{"rendered":"java \u88dc\u7fd2, java \u96fb\u8166\u88dc\u7fd2\u73ed, java 1 \u5c0d 1 \u79c1\u4eba\u88dc\u7fd2-\u7b2c\u4e00\u7ae0"},"content":{"rendered":"


\n<\/p>\n

java 補習, java 電腦補習班<\/a>, java 1對1 私人補習,java程式編寫, java, 大學生java課程<\/h1>\n

本文盡量用簡單的方式，說明Java程式語言的撰寫以及應用。<\/p>\n

建議在看完，並理解之後，還是要去觀看教科書、參考書，才能完全理解。<\/p>\n

java 補習>運算符號(Operator)<\/strong><\/h2>\n

Java語言在運算式的部分,和C語言<\/a>極為類似, 除了沒有sizeof, pointer和struct相關的運算符號外, 另外新增了>>>向右無號shift, 以及用來判斷物件型態的instanceof。Java的常數的表示法也和C相同,而Java裡的新資料型態boolean<\/a>的合法值為true和false兩個常數。<\/p>\n

java 補習>運算符號(Operator)>算術(Arithmetic)運算符號<\/h3>\n\n\n\n\n\n\n\n\n\n\n
運算符號<\/td>\n功能敘述<\/td>\n<\/tr>\n
+<\/td>\n加<\/td>\n<\/tr>\n
*<\/td>\n乘<\/td>\n<\/tr>\n
–<\/td>\n減<\/td>\n<\/tr>\n
\/<\/td>\n除<\/td>\n<\/tr>\n
%<\/td>\n餘數<\/td>\n<\/tr>\n
++<\/td>\n加一<\/td>\n<\/tr>\n
—<\/td>\n減一<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

java 補習>運算符號(Operator)>邏輯(logic)運算符號<\/strong><\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
運算符號<\/td>\n功能敘述<\/td>\n<\/tr>\n
><\/td>\n大於<\/td>\n<\/tr>\n
<<\/td>\n小於<\/td>\n<\/tr>\n
>=<\/td>\n大於等於<\/td>\n<\/tr>\n
<=<\/td>\n小於等於<\/td>\n<\/tr>\n
==<\/td>\n等於<\/td>\n<\/tr>\n
!=<\/td>\n不等於<\/td>\n<\/tr>\n
&&<\/td>\nlogic AND<\/td>\n<\/tr>\n
||<\/td>\nlogic OR<\/td>\n<\/tr>\n
!<\/td>\nlogic NOT<\/td>\n<\/tr>\n
instanceof<\/td>\nreference instanceof ClassName
\n判斷reference所指到的物件其型態是否和ClassName相容<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Java語言和C語言有關邏輯運算最大的不同,在於Java以boolean<\/a>資料型態(只有true和false兩種值)判斷條件是否成立,而C語言只能使用0或非0。<\/p>\n

java 補習>運算符號(Operator)>位元(Bit)運算符號<\/strong><\/h3>\n\n\n\n\n\n\n\n\n\n\n
運算符號<\/td>\n功能敘述<\/td>\n<\/tr>\n
&<\/td>\nbit AND<\/td>\n<\/tr>\n
<<<\/td>\nleft bit shift<\/td>\n<\/tr>\n
|<\/td>\nbit OR<\/td>\n<\/tr>\n
>><\/td>\nright bit shift with sign<\/td>\n<\/tr>\n
^<\/td>\nbit XOR<\/td>\n<\/tr>\n
~<\/td>\n1補數<\/td>\n<\/tr>\n
>>><\/td>\n同>>但左邊一律補零<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

java 補習>運算符號(Operator)>其他運算符號<\/strong><\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
運算元<\/td>\n功能敘述<\/td>\n<\/tr>\n
=<\/td>\n將右邊的值複製到左邊的變數<\/td>\n<\/tr>\n
(type)<\/td>\n將右邊的數值或reference轉換成type型別<\/td>\n<\/tr>\n
+=<\/td>\n將右邊的數值加上左邊的數值然後指定給左邊的變數<\/td>\n<\/tr>\n
?:<\/td>\n若?左邊成立則做:左邊否則做:右邊<\/td>\n<\/tr>\n
,<\/td>\n合併兩個運算視為一個敘述<\/td>\n<\/tr>\n
(運算式)<\/td>\n表示()內優先運算<\/td>\n<\/tr>\n
.<\/td>\nReference.ObjectMember或ClassName.ClassName
\n存取物件或類別成員<\/td>\n<\/tr>\n
new<\/td>\n產生物件<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

java 補習>運算符號(Operator)>優先權<\/strong><\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
種類<\/td>\n運算符號<\/td>\n結合順序<\/td>\n<\/tr>\n
group<\/td>\n(op)<\/td>\nleft to right<\/td>\n<\/tr>\n
postfix<\/td>\n[] . (params) op++ op–<\/td>\nright to left<\/td>\n<\/tr>\n
prefix<\/td>\n++op –op +op -op ~ !<\/td>\nright to left<\/td>\n<\/tr>\n
creation or casting<\/td>\nnew (type)op<\/td>\nright to left<\/td>\n<\/tr>\n
multiplicative<\/td>\n* \/ %<\/td>\nleft to right<\/td>\n<\/tr>\n
additive<\/td>\n+ –<\/td>\nleft to right<\/td>\n<\/tr>\n
shift<\/td>\n<< >> >>><\/td>\nleft to right<\/td>\n<\/tr>\n
relational<\/td>\n< > <= >= instanceof ==<\/td>\nleft to right<\/td>\n<\/tr>\n
equality<\/td>\n== !=<\/td>\nleft to right<\/td>\n<\/tr>\n
bitwise and<\/td>\n&<\/td>\nleft to right<\/td>\n<\/tr>\n
bitwise exclusive or<\/td>\n^<\/td>\nleft to right<\/td>\n<\/tr>\n
bitwise inclusive or<\/td>\n|<\/td>\nleft to right<\/td>\n<\/tr>\n
logical and<\/td>\n&&<\/td>\nleft to right<\/td>\n<\/tr>\n
logical or<\/td>\n||<\/td>\nleft to right<\/td>\n<\/tr>\n
conditional<\/td>\n? :<\/td>\nright to left<\/td>\n<\/tr>\n
assignment<\/td>\n= += -= *= \/= %= &= ^= |= <<= >>= >>>=<\/td>\nright to left<\/td>\n<\/tr>\n
seperator<\/td>\n,<\/td>\nleft to right<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

java 補習>中英文術語對照<\/strong><\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
中英文術語對照<\/th>\n<\/tr>\n<\/thead>\n
文字編輯器<\/td>\ntext editor<\/td>\n<\/tr>\n
整合開發環境<\/td>\nIntegrated Development Environment, IDE<\/td>\n<\/tr>\n
關鍵字<\/td>\nkeyword<\/td>\n<\/tr>\n
保留字<\/td>\nreserved word<\/td>\n<\/tr>\n
修飾子<\/td>\nmodifier<\/td>\n<\/tr>\n
宣告<\/td>\ndeclare<\/td>\n<\/tr>\n
字串<\/td>\nstring<\/td>\n<\/tr>\n
註解<\/td>\ncomment<\/td>\n<\/tr>\n
識別字<\/td>\nidentifier<\/td>\n<\/tr>\n
變數<\/td>\nvariable<\/td>\n<\/tr>\n
方法<\/td>\nmethod<\/td>\n<\/tr>\n
參數<\/td>\nparameter<\/td>\n<\/tr>\n
類別<\/td>\nclass<\/a><\/td>\n<\/tr>\n
屬性<\/td>\nfield<\/td>\n<\/tr>\n
物件<\/td>\nobject<\/td>\n<\/tr>\n
物件導向程式語言<\/td>\nobject-oriented programming language<\/td>\n<\/tr>\n
Java 虛擬機器<\/td>\nJava Virtual Machine, JVM<\/td>\n<\/tr>\n
呼叫<\/td>\ncall<\/td>\n<\/tr>\n
參考<\/td>\nreference<\/td>\n<\/tr>\n
強型態<\/td>\nstrong typing<\/td>\n<\/tr>\n
宣告<\/td>\ndeclaration<\/td>\n<\/tr>\n
資料型態<\/td>\ndata type<\/td>\n<\/tr>\n
建構子<\/td>\nconstructor<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

java 補習>資料型態 <\/strong><\/h2>\n

java 補習>資料型態 >變數名稱：<\/strong><\/h3>\n

雖然說可以按照使用者想要的名稱去定義，但是有幾個限制，建議參考書上的說明，會比較好<\/p>\n

這邊建議各位盡量取有意義的名稱<\/p>\n

java 補習>資料型態 >資料型態：<\/strong><\/h3>\n

這代表這個變數的類型<\/p>\n

第5行 將 變數 text 宣告成 String 型態 (切記 String 的 S 一定要大寫)<\/p>\n

這代表 變數 text 存放的是 字串 ， 而且他就只能存 字串 ，不能存其他東西<\/p>\n

第6行 ~ 第8行 將 length 、 weidth 與 Height 宣告成 int 型態<\/p>\n

這代表 以上三個變數為 整數型態<\/p>\n

其代表的意義就是，這三個變數只能存 整數 而且他的大小介於 -2147483648 ~ 2147483647 之間<\/p>\n

第9行 將 pi 宣告成 double 型態<\/p>\n

這代表 pi 這個變數 為 雙精確浮點數 型態 (這翻譯我個人覺得很爛，反正他就是代表 可以存小數點後很多位的意思)<\/p>\n

第10行 宣告 hp 為 float 型態<\/p>\n

這代表 hp 這個變數 是 單精確浮點數 型態 (同上，他是double的弱化版)<\/p>\n

以下說明資料型態代表的意義 (資料取自於wiki)：<\/p>\n

boolean<\/a> : 布林值，僅有兩個常數，true 和 false.<\/p>\n

byte :位元組型別值，長度一個位元組，取值範圍是 -128 至 127。<\/p>\n

short：短整數，長度兩個位元組，取值範圍是 -32768 至 32767。<\/p>\n

int：整數，長度32位元（四個位元組），取值範圍是 -2147483648 至 2147483647<\/p>\n

long：長整數，長度八個位元組，取值範圍是 -9223372036854775808 至 9223372036854775807<\/p>\n

float：單精度IEEE754浮點數，長度四個位元組。<\/p>\n

double：倍精度IEEE754浮點數，長度八個位元組。<\/p>\n

char：字元型，長度16位元，支援所有的UCS-2和ASCII編碼。<\/p>\n

到這邊，我們宣告了變數，告訴電腦 抽屜的名稱(變數名稱) 也 告訴電腦 抽屜存放什麼類型的東西(資料型態)<\/p>\n

\"IT電腦補習

立刻註冊及報名電腦補習課程吧!<\/p><\/div>\n

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