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                ### 語法 ~~~ 修飾符 方法名(參數列表){} //構造方法沒有返回值 ~~~ **注意** 1. 構造方法終身只會運行一次 . 2. 構造方法在實例化對象的時候自動運行 . 3. 編譯的時候javac會檢查類中是否有構造方法,如果有就是用用戶編寫的,如果沒有javac就會自動添加一個空參數構造方法. 4. **構造方法是可以重載的** . #### this在構造方法之間調用 ~~~ public class Test { public String name; public int age; public Test() { this("jack", 20); //使用無參數構造器調用有參數構造器 } public Test(String name, int age) { int x = 10; this.name = name; this.age = age; } } ~~~ 調用 ~~~ public class Main { public static void main(String[] args) { Main m = new Main(); System.out.print(m.name); } } ~~~ 結果 ~~~ jack ~~~ **注意** 1. this() 必須在第一行, 如果this前面有語句,則會報錯 .
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