How can methods be implemented in interfaces?

In Java, starting from version 8, interfaces can contain:

• Abstract methods — without implementation, which must be implemented in classes.
• Default methods — with implementation, which can be overridden but are not required.
• Static methods — with implementation, called through the interface.

Example of implementing default and static methods in an interface:

public interface MyInterface {
    void abstractMethod(); // abstract method

    default void defaultMethod() {
        System.out.println("This is a default method");
    }

    static void staticMethod() {
        System.out.println("This is a static interface method");
    }
}

Classes implementing the interface are required to implement abstract methods but can use or override default methods. Static methods are called directly through the interface.