试试这个：
MyObject obj = new MyObject();if(obj instanceof MyObject){System.out.println("true");} //true由于继承，这对接口也有效：
class Animal {}class Dog extends Animal {}Dog obj = new Dog();Animal animal = new Dog();if(obj instanceof Animal){System.out.println("true");} //trueif(animal instanceof Animal){System.out.println("true");} //trueif(animal instanceof Dog){System.out.println("true");} //true有关instanceof的更多信息，请访问：http :
//mindprod.com/jgloss/instanceof.html
