Java interface private method software#

Java developers use the interface language feature to abstract class interfaces, thus decoupling classes from their users. This coupling can lead to problems when implementations must evolve (perhaps exposed fields must be removed). For example, method code may rely on external variables and a class's users may become dependent on fields that should have been hidden.

Java interface private method software#

When implementations are exposed, interdependencies between software components can arise. An implementation should be hidden from external code so that it can be changed to meet evolving requirements. What can you do with interfaces in your Java programs? Get an overview with Jeff's Six roles of the Java interface.Ī method's code, which supports the method's interface, and that part of a class that supports the class's interface (such as private fields) is known as the method's or class's implementation. The private String name and private long amount fields are inaccessible. The Account(String name, long amount) constructor and the void deposit(long amount), String getName(), long getAmount(), and void setAmount(long amount) methods form the Account class's interface: they are accessible to external code. The Account class and its interface class Account A class's interface consists of some combination of methods, fields, constructors, and other entities.

As I explained in Java 101: Classes and objects in Java, the interface is the part of the class that is accessible to code located outside of it. What's often confusing to Java beginners is that classes also have interfaces. Double average(double x, double y) // interface between average(10, 15) call and return (x + y) / 2