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Java Class class isInterface() method with example

Class class isInterface() method: Here, we are going to learn about the isInterface() method of Class class with its syntax and example.
Submitted by Preeti Jain, on November 02, 2019

Class class isInterface() method

• isInterface() method is available in java.lang package.
• isInterface() method is used to check whether this Class object denotes an interface or not.
• isInterface() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• isInterface() method does not throw an exception at the time of checking the Class is declared as an interface or not.

Syntax:

    public boolean isInterface();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of this method is boolean, it returns a boolean value based on the following cases,

• It returns true, when this Class denotes an interface.
• It returns false, when this Class does not denote as an interface.

Example:

// Java program to demonstrate the example 
// of boolean isInterface() method of Class 

public class IsInterfaceOfClass {
    public static void main(String[] args) {
        // Create and Return String class
        String str = new String();
        Class cl1 = str.getClass();

        // Create and Return IsInstanceOfClass class
        IsInterfaceOfClass ic = new IsInterfaceOfClass();
        Class cl2 = ic.getClass();

        // We are checking the class representing an interface
        boolean b1 = cl1.isInterface();
        boolean b2 = cl2.isInterface();

        System.out.print("Is" + " " + cl1.getSimpleName() + " ");
        System.out.println("denotes an interface" + ": " + b1);

        System.out.print("Is" + " " + cl2.getSimpleName() + " ");
        System.out.println("denotes an interface" + ": " + b2);
    }
}

Output

Is String denotes an interface: false
Is IsInterfaceOfClass denotes an interface: false