instanceof
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instanceof用来判断某个对象是否是某个类的实例
class A{
public void fun1(){
System.out.println("A --> public void fun1()") ;
}
public void fun2(){
this.fun1() ;
}
} ;
class B extends A{
public void fun1(){
System.out.println("B --> public void fun1()") ;
}
public void fun3(){
System.out.println("B --> public void fun3()") ;
}
} ;
public class InstanceofDemo01
{
public static void main(String args[]){
A a1 = new B() ;
System.out.println("A a1 = new B():" + (a1 instanceof A)) ;
System.out.println("A a1 = new B():" + (a1 instanceof B)) ;
A a2 = new A() ;
System.out.println("A a2 = new B():" + (a2 instanceof A)) ;
System.out.println("A a2 = new B():" + (a2 instanceof B)) ;
}
}
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