Inheritance

Real estate may include property, money and securities to provide guarantees to its beneficiaries. The state of real estate may be due to congenital, diligent, even unethical behavior. Excellent athletes' behavior, belief, and morality can have a greater impact on successors than property itself. Psion's life can be influenced by the psychological, emotional or spiritual elements of its heritage. Arthur Miller's "Death of a Salesman" has proved that heirs are likely to be affected by inheritance, impairing the belief that inheritance will benefit human descendants.

Inheritance: Classes can be inherited. By default, a class is a field and method of its superclass. Since inheritance is transitive, a class can inherit from another class of another class to a base class (usually Object, implicit / nonexistent). Subclasses can override certain methods and fields to change the default behavior. Combination: If the type of Field is a class, this field holds references to other objects and creates an association between them. Just as classes use different objects to provide some or all of their functions without having to understand subtle differences in simple associations, aggregations, and combinations differences, the combination can be visually Let's define it.

Class inheritance is just a complex object construct. All classes generate composite objects, but not all compound objects are generated by class or class inheritance. "Object configuration support in class inheritance" means forming complex objects from widget components rather than inheriting all properties from ancestors in the class hierarchy. Inevitable repetition problem: Because of the inflexible hierarchy, new use cases are usually implemented by copying rather than by extension, and similar classes will unexpectedly branch. Once replication is started, it is unknown which class needs to start a new class or why.