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instanceof Keyword in Java
This operator is used only for object reference variables. The operator checks whether the object is of a particular type (class type or interface type). instanceof operator is written as −
( Object reference variable ) instanceof (class/interface type)
If the object referred by the variable on the left side of the operator passes the IS-A check for the class/interface type on the right side, then the result will be true. Following is an example -
Example
public class Test { public static void main(String args[]) { String name = "James"; // following will return true since name is type of String boolean result = name instanceof String; System.out.println( result ); } }
This will produce the following result −
Output
true
This operator will still return true if the object being compared is the assignment compatible with the type on the right. Following is one more example −
Example
class Vehicle {} public class Car extends Vehicle { public static void main(String args[]) { Vehicle a = new Car(); boolean result = a instanceof Car; System.out.println( result ); } }
This will produce the following result −
Output
true
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