How to invoke a Java interface

1 year ago
Jackson Davis
1 minute

In Java, an interface is a protocol or contract that defines what methods a class must follow, without including the implementation. To invoke an interface, you can follow these steps:

  1. Create a class that implements an interface.
  2. Implement the methods declared in the interface in the implementing class.
  3. Create a reference variable for an interface and initialize it with an object of the implementing class.
  4. Use interface reference variables to call methods declared in the interface.

Here is a simple example code:

// 定义一个接口
interface MyInterface {
    void myMethod();
}

// 实现接口
class MyImplementation implements MyInterface {
    public void myMethod() {
        System.out.println("调用了接口中的方法");
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建接口引用变量，并将其初始化为实现类的对象
        MyInterface obj = new MyImplementation();
        
        // 调用接口中的方法
        obj.myMethod();
    }
}

Running the above code will output “Calling the method in the interface”.

bannerAds