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Redhung @ Nationtal Chung Cheng University, Chiayi, Taiwan.
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TA-java-method-109
1.
redhung@hung.red TA-LESSON @ JAVA
OOP PROGRAMMING — METHOD
2.
>_ ECHO `WHOAMI` Interning
at CHT Security Co., Ltd. CTF Player Focusing on Reversing, Pwning Contact: redhung@hung.red
3.
>_ CAT ./OVERVIEW Static
Method & Non-static Method Return Value Variable & Out of scope Lab 0x0 0x1 0x2 0x3
4.
Static Method &
Non-static Method
5.
>_ METHODS Static method
可以不被實例化就使用 Non-static method 必須被實例化(宣告物件)才能使⽤ Well-known static method : public static void main(String args[])
6.
>_ METHODS public static
void main(String args[]) 封裝 等級 靜態 Or 非靜態 回傳 型態 函式名稱 & 參數
7.
>_ METHODS
8.
Return Value
9.
>_ RETURN VALUE 每個Function都會定義他的回傳值 E.g.
public static void main(String args[]) 就像我們在定義變數的資料型別⼀樣,我們會定義function 的回傳型別,來決定回傳值要得到的資料型別
10.
>_ RETURN VALUE
11.
Variable & Out
Of Scope
12.
>_ VARIABLES 變數是有存取範圍的,當超出範圍時就不能被存取 舉個最簡單的例⼦:for 迴圈 for(int
i=0 ; i<10 ; i++){System.out.println(i);} 變數 i 在 for 迴圈結束後就不再能夠被存取 另⼀個例⼦:Global Variable & Local Variable
13.
LAB
14.
>_ LAB 1. 請完成兩個Method來讓程式正常執⾏ 2.
第⼀個Method回傳值為Void 3. 第⼆個Method回傳值為String 4. Main function第⼀⾏印出9m88,第⼆⾏印出9m88LovesDancing
15.
>_ LAB
16.
THANK YOU! redhung@hung.red r3dhun9 @r3dhun9
Philip Chen
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