What methods can be contained in an interface?

• Abstract methods (without implementation).
• Static methods (with implementation).
• Default methods (with implementation and the default keyword).

// Interface example
interface MyInterface {

    // Abstract method
    void abstractMethod();

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

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