Instanceof Operator in Java

→ In instanceof operator use to check whether an object is an instance of specified type (class, sub-class or interface).

→ The instanceof operator is also known as type comparison operator because it compares the instance with type. It returns either true or false.

Simple example of instanceof operator

public interface Vehicle {
    //Vehicle interface properties
}
public class Car implements Vehicle {
    //Car class code
}
public class Audi extends Car {
     
    public static void main(String[] args) {
        Audi c1 = new Audi();
         
        if(c1 instanceof Audi){
            System.out.println("c1 is a instance of Audi");
        }
 
        if(c1 instanceof Car){
            System.out.println("c1 is a instance of Car");
        }
 
        if(c1 instanceof Vehicle){
            System.out.println("c1 is a instance of Vehicle");
        }
    }
}

Output:

c1 is an instance of Audi
c1 is an instance of Car
c1 is an instance of Vehicle

Downcasting by the help of Instanceof Operator

class AnimalPlant { }  
class Dengue extends AnimalPlant {  
  static void method(AnimalPlant a) {  
    if(a instanceof Dengue){  
       Dengue d=(Dengue)a;//downcasting  
       System.out.println("ok downcasting performed by Instanceof");  
    }  
  }  
   public static void main (String [] args) {  
    AnimalPlant a=new Dengue();  
    Dengue.method(a);  
  }  
    
 }  

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OOPs Concepts

Instanceof Operator in Java

Simple example of instanceof operator

Downcasting by the help of Instanceof Operator