// instanceof Checks whether object is instance of a given class
Object obj = new String("Hello World!");
// obj is instance of String and as such first msg is printed out
if(obj instanceof String) {	System.out.println(obj + " is instance of String class"); // This msg is printed
} else {	System.out.println(obj + " is not instance of String class");
}

// instanceof can be used to check whether an object
// is an instance of a given class or not, as illustrated below
public class Main {	public static void main(String[] args) {	String str = new String("Foo");	System.out.println( str instanceof String); // true	Shape s = new Triangle();	// s is instance of parent class Shape	System.out.println(s instanceof Shape); // true	// s is also instance of child class called Triangle	System.out.println(s instanceof Triangle); // true	}
}
class Shape {	public void draw() {	System.out.println("Shape draw.");	}
}
class Triangle extends Shape {	public void draw() {	System.out.println("Triangle draw.");	}
}

class Main { public static void main(String[] args) { // create a variable of string type String name = "Programiz"; // checks if name is instance of String boolean result1 = name instanceof String; System.out.println("name is an instance of String: " + result1); // create an object of Main Main obj = new Main(); // checks if obj is an instance of Main boolean result2 = obj instanceof Main; System.out.println("obj is an instance of Main: " + result2); }
}

class Main { public static void main(String[] args) { String str = "Programiz"; boolean result; // checks if str is an instance of // the String class result = str instanceof String; System.out.println("Is str an object of String? " + result); }
}

// Java Program to check if an object of the subclass
// is also an instance of the superclass
// superclass
class Animal {
}
// subclass
class Dog extends Animal {
}
class Main { public static void main(String[] args) { // create an object of the subclass Dog d1 = new Dog(); // checks if d1 is an instance of the subclass System.out.println(d1 instanceof Dog); // prints true // checks if d1 is an instance of the superclass System.out.println(d1 instanceof Animal); // prints true }
}

@Test
public void givenWhenInstanceIsCorrect_thenReturnTrue() { Ring ring = new Ring(); Assert.assertTrue(ring instanceof Round);
}