instanceof运算符

2019-11-06 08:05:18

字体：大中小

来源：转载

供稿：网友

instance是java的二元运算符，用来判断他左边的对象是否为右面类（接口，抽象类，父类）的实例

12345678910111213141516171819202122232425262728293031323334353637 interfaceA{ }classB implementsA{ }classC extendsB{ }publicclass Iinstanceof { publicstatic void main(String[] args) { A ab=newB(); A ac=newC(); B bc=newC(); B bb=newB(); C cc=newC(); //对象实现一个接口，用这个对象和这个接口进行instanceof判断，都为true。 System.out.PRintln("ab instanceof A="+(ab instanceofA)); System.out.println("ac instanceof A="+(ac instanceofA)); System.out.println("bc instanceof A="+(bc instanceofA)); System.out.println("bb instanceof A="+(bb instanceofA)); System.out.println("cc instanceof A="+(cc instanceofA)); //对象和父类进行instanceof判断，都为true System.out.println("ab instanceof B="+(ab instanceofB)); System.out.println("ac instanceof B="+(ac instanceofB)); System.out.println("bc instanceof B="+(bc instanceofB)); System.out.println("bb instanceof B="+(bb instanceofB)); System.out.println("cc instanceof B="+(cc instanceofB)); //对象和他的子类进行instanceof判断为false System.out.println("ab instanceof C="+(ab instanceofC)); System.out.println("ac instanceof C="+(ac instanceofC)); System.out.println("bc instanceof C="+(bc instanceofC)); System.out.println("bb instanceof C="+(bb instanceofC)); System.out.println("cc instanceof C="+(cc instanceofC)); }}

程序输出： ab instanceof A=true ac instanceof A=true bc instanceof A=true bb instanceof A=true cc instanceof A=true ab instanceof B=true ac instanceof B=true bc instanceof B=true bb instanceof B=true cc instanceof B=true ab instanceof C=false ac instanceof C=true bc instanceof C=true bb instanceof C=false cc instanceof C=true

上一篇：hihocoder 139周

下一篇：最少步数

学习交流

索泰发布一款GTX 1070 Mini迷你版本:小机

索泰发布一款GTX 1070 Mini迷你版本:小机箱大爱...

热门图片

猜你喜欢的新闻

猜你喜欢的关注