Java 操作符

子系统的特点

instanceof 操作符

Animal类是Dog的直接父类，Creature类和Object类是Dog的间接父类，因此

Dog dog=new Dog();
System.out.println(dog instanceof Dog);          //打印true
System.out.println(dog instanceof Animal);       //打印true
System.out.println(dog instanceof Creature);         //打印true
System.out.println(dog instanceof Object);        //打印true
//instanceof 右边的操作元也可以是接口名
interface interfaceEx();
class A implements InterfaceEx();
class B extends A();
//对于以下代码，打印true
B b=new B();
System.out.printIn(b instanceof InterfaceEx);  打印true

Java语言各种操作符