From an object-oriented programming perspective, the main difference between an interface ... constructor. Can have abstract methods. Can have default and static methods (introduced in Java ...

Point(int a) { this(a, a); } Point(int a, int b) { x = a; y = b; } } Constructors are one of the most important constructs in the Java programming language. The ability to overload constructors in ...

Rather than implementing a method in a functional interface ... the flexibility of Java’s type inference and method reference mechanics in the context of its functional programming capabilities.