In Java find answer

Which of the following statements about Java interface is correct?

a. Java interface can contain both concrete and abstract methods.

b. Java interface is a feature that comes with the JDK. A user cannot define his own interface.

c. Java interface can contain both constant variables and abstract method headers.

d. In Java, one class can be implemented to only one interface.

Which of the following statements about a Java interface are true? Check all that apply.

A Java interface specifies behavior that must be implemented for the class to compile either implemented directly or by utilizing the default.)

All methods in an interface are abstract (as of Java 8)

All methods in a Java interface must be private.

An interface can have constants.

A Java interface must contain more than one method.

A Java interface defines a set of methods that are required for the implementing class (these can be either implemented by the class or the class can use the default)

An interface can have instance variables.