import java.util.*; public class BookTest { public static void main(String[] args) { //Book book = new Book("A Tale of Two Cities", 1895); Book book = new Book("A Tale of Two Cities"); System.out.println(book.title); System.out.println…
在编程的过程中,我们经常会遇到多个类的继承问题,那么多个类的构造器是按照什么顺序调用的呢? 先看一段代码: public class Meal { public Meal() { System.out.println("meal constructor() "); } } public class Bread { public Bread() { System.out.println("bread constructor() "); } } public class…
<script type="text/javascript"> var o = {}; var o1 = new Object();//这2种方式创建对象是一样的,因为对象都有默认属性constructor构造器,函数也是对象,js一切都是对象,函数也有构造器函数也是对象,构造器是对象的. o.constructor 的构造器为 function Object(); o1.constructor 的构造器为 function Object(); o.constructor…
