Java Class isInterface() Method

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Description

The Java Class isInterface() method determines if the specified Class object represents an interface type.

Declaration

Following is the declaration for java.lang.Class.isInterface() method

public boolean isInterface()

Parameters

NA

Return Value

This method returns true if this object represents an interface, else false.

Exception

NA

Getting Interface Status of a Class Example

The following example shows the usage of java.lang.Class.isInterface() method. In this program, we've created an instance of ClassDemo and then using getClass() method, the class of the instance is retrieved. Using isInterface(), we've retrieved interface status and printed it.

package com.tutorialspoint;

public class ClassDemo {

   public static void main(String[] args) {

      ClassDemo c = new ClassDemo();
      Class cls = c.getClass();

      // determines if the specified Class object represents an interface type
      boolean retval = cls.isInterface();
      System.out.println("It is an interface ? " + retval);       
   }
}

Output

Let us compile and run the above program, this will produce the following result −

It is an interface ? false

Getting Interface Status of an Interface Example

The following example shows the usage of java.lang.Class.isInterface() method. In this program, we've used class of FunctionalInterface. Using isInterface(), we've retrieved interface status and printed it.

package com.tutorialspoint;

public class ClassDemo {

   public static void main(String[] args) {
      Class cls = FunctionalInterface.class;
      
	  // determines if the specified Class object represents an interface type
      boolean retval = cls.isInterface();
      
	  System.out.println("It is an interface ? " + retval);       
   }
}

Output

Let us compile and run the above program, this will produce the following result −

It is an interface ? true

Getting Interface Status of a List Example

The following example shows the usage of java.lang.Class.isInterface() method. In this program, we've used class of List. Using isInterface(), we've retrieved interface status and printed it.

package com.tutorialspoint;

import java.util.List;

public class ClassDemo {

   public static void main(String[] args) {
      Class cls = List.class;
      
	  // determines if the specified Class object represents an interface type
      boolean retval = cls.isInterface();
      
	  System.out.println("It is an interface ? " + retval);       
   }
}

Output

Let us compile and run the above program, this will produce the following result −

It is an interface ? true