使用implements關(guān)鍵字實(shí)現(xiàn)接口，類需提供接口中所有方法的具體實(shí)現(xiàn)，支持多接口時(shí)用逗號(hào)分隔，確保方法為public，Java 8後默認(rèn)和靜態(tài)方法無(wú)需重寫(xiě)。
To implement an interface in Java, you use the implements keyword in your class definition. An interface defines a contract — a set of method signatures that implementing classes must provide. Here's how to do it step by step.
Define the Interface
Start by creating an interface with abstract methods (methods without a body). These methods are public and abstract by default.Example:
interface Drivable {
void start();
void stop();
}
Create a Class That Implements the Interface
Use the implements keyword followed by the interface name. The class must provide concrete implementations for all methods declared in the interface.Example:
class Car implements Drivable {
public void start() {
System.out.println("Car started");
}
public void stop() {
System.out.println("Car stopped");
}
}
Using Multiple Interfaces
A class can implement more than one interface, separated by commas. This allows a class to support multiple behaviors.Example:
interface Flyable {
void fly();
}
class Airplane implements Drivable, Flyable {
public void start() {
System.out.println("Airplane engine started");
}
public void stop() {
System.out.println("Airplane stopped");
}
public void fly() {
System.out.println("Airplane flying");
}
}
Key Points to Remember
- All methods in an interface must be implemented unless the class is abstract.
- Implemented methods must have public access modifier.
- Since Java 8, interfaces can have default and static methods — these do not need to be overridden.
- From Java 9, private methods are allowed in interfaces but cannot be accessed directly by implementing classes.
Basically, implementing an interface ensures your class supports specific functionality, promoting consistency and polymorphism in your code. Just make sure all required methods are properly defined.
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