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This article mainly introduces the relevant knowledge of "what is the difference between java abstract class and interface". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "what is the difference between java abstract class and interface" can help you solve the problem.

Difference

1. Abstract class and subclass are the relationship of is, and the interface is the relationship of like. Abstract class has high degree of coupling and better reuse and maintainability, while the interface is on the contrary.

2. Abstractions can only be inherited separately, and multiple interfaces and subclasses can be implemented.

Abstractions can have non-constant member variables, interfaces can only have constant member variables, interface 1.8 has default methods, and abstractions have member methods.

Example

Examples of doors and alarms: both doors have open () and close () actions, and we can define this abstract concept through abstract classes and interfaces:

What are the collection classes of abstract class Door {public abstract void open (); public abstract void close ();} Java the collections in Java are mainly divided into four categories:

1. List list: ordered and repeatable

2. Queue queue: orderly and repeatable

3. Set collection: non-repeatable

4. Map mapping: unordered, key unique, value not unique.

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