Indicate whether the statement it true or false. An abstract method mast not have any executable code. In order to be used, an interface must implement a class. A class can extend an interface. A class that implements an interface can include methods that are not required by the A class that implements an interface can leave out methods that are required by the interface An interface definition can include constant declarations. An interface definition can include concrete methods. A Java interface must have at least one defined constructor. In a non-empty stack, the item that has been in the stack the longest is at the bottom of the The first element to be stored in a stack is also the first element removed from the stack. A stack is a first in. first out structure. For a non-empty stack, top returns the value of the most recent item pushed onto the stack Object-oriented classes, when designed properly, are easy to reuse. A private variable cannot be accessed from anywhere. A class definition can be used to create multiple objects. A class that contains a mom method is called a Java application