Java重寫構造方法
阿新 • • 發佈:2018-11-10
public class TestSuper { public static void main(String[] args) { new ChildClass("alex", 10, 198).f(); } } class Parent { Parent() { System.out.println("father"); } public void drive() { System.out.println("parent can driving"); } } class Child extendsParent { Child() { System.out.println("son"); } public void drive() { super.drive(); System.out.println("child can driving"); } } class FatherClass { public int value; public String username; public int age; //父類的構造方法 FatherClass(String username, intage) { this.username = username; this.age = age; } public void f() { value = 100; System.out.println("FatherClass.value=" + value); } } class ChildClass extends FatherClass { public int value; int height; /** * 如果重寫構造父類的構造方法,則子類的要給上面的內容給寫好,然後用super引入父類的屬性 * *@param username * @param age * @param height */ ChildClass(String username, int age, int height) { super(username, age); this.height = height; System.out.println("child construct"); System.out.println(this.username); } public void f() { super.f(); value = 200; System.out.println("ChildClass.value=" + value); System.out.println(value); System.out.println(super.value); //呼叫父類物件的成員變數 } }