"new" 在Java中代表实例化的意思, A a = new A()代表实例化了一个对象a, 这个对象a属于A类. 可以认为A是一个抽象概念, 对象a是一个实体(存储于内存), 等式左边实际上就是用类A定义对象a, 等式右边就是创造对象a的过程.
a a=new a 应该是 a a=new a(); 是创建一个新的实例。a a = b ,是新创建一个类型为a的变量a,且他的值等于b
子类A代码如下: public class A extends B{ public A(){ System.out.println("子类A的构造函数"); } static { System.out.println("子类A的中的静态代码块"); } { System.out.println("子类A的中的非静态代码块 sya()1"); } public static void main(String[] args) { A a = new A(); Syste...
For End Users on a Desktop or Laptop computer Download Java for Desktops What is Java Help for end users Developers and Enterprise Administrators Free Java Development Kit (JDK) downloads and resources from Oracle, the stewards of Java Developer Downloads Developer Resources Enterprise Resources Ope...
new A(){}是一个匿名内部类 表示一个没有类名的A的子类,大括号内部相当于平常子类的写法 B(){...}可以是新定义的方法,也可以是重写A类的方法
实例化一个类 说通俗点就是给你创建的那个类赋予行动能力,这个类是A()类写好的构造方法实现的 比如你定义一个CLASS 人 在CLASS里面写好了人有手有脚或什么能力, 然后A aa = new A()之后这个人就活在你的程序里面了
With the latest release of the Tools for Graal Development Kit for Micronaut we provide support for the latest version of the Graal Development Kit for Micronaut (GDK) and a new tool, the Multicloud Tester… Announcing Graal Development Kit for Micronaut 4.7.3 Announcing Graal Development Kit...
Java’s 30th anniversary. Join a who’s who of Java luminaries as we celebrate with three days of learning, laughter, and the launch of Java 24. Register now and save $100 Looking for other Java downloads? OpenJDK Early Access Builds ...
所以,String a = new String("a")这句代码创建的对象包括:1. 字符串常量"a",存储在字符串常量池...