Syntax error Elaborate the legal operands of the instance of operator in java?

Elaborate the legal operands of the instance of operator in java?

The instanceof operator in Java is used to find whether a reference is an instance of a Type i.e. class or an interface.

Example

 Live Demo

public class InstanceOfExample {
   public static void main(String args[]) {
      String str = "hello";
      boolean bool = str instanceof String;
      System.out.println(bool);
   }
}

Output

true

Legal operands of the instanceof operator

The following are the only legal operands of the instanceof operator −

  • Left operand − It must be a reference representing an object.
  • Right operand − It must be the name of Java class or, interface.

Except these two if you use any other operands a compile time error will be generated.

public class InstanceOfExample {
   public static void main(String args[]) {
      int i =20;
      boolean bool = i instanceof String;
      System.out.println(bool);
   }
}

Compile time error

InstanceOfExample.java:4: error: unexpected type
      boolean bool = i instanceof String;
                     ^
   required: reference
   found: int
1 error
Updated on: 2019-07-30T22:30:26+05:30

159 Views

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements