How to write class inheritance interface in java

In Java, a class inherits one or more interfaces through the implements keyword. The methods defined by the interface must be implemented in the class: Define the interface: declare the method signature, but no specific implementation. Inherit an interface using implements: Inherit an interface using implements keyword and the interface name after the class name. Implement interface methods: Implement all methods declared in the inherited interface in the class. The method signature must exactly match the signature defined in the interface.

How to write class inheritance interface in Java

In Java, a class can use the implements keyword to inherit a or Multiple interfaces. Interfaces define a set of methods, but they do not provide implementations. The class must implement all methods declared in the inherited interface, otherwise compilation errors will occur.

Syntax:

<code class="java">public class <class_name> implements <interface_name> {
    // 类的方法实现
}</code>

Steps:

1. Define the interface: First, create An interface that contains the method signatures to be implemented by the class:

<code class="java">public interface <interface_name> {
    public void <method_name_1>();
    public int <method_name_2>();
    // 其他接口方法...
}</code>

2. Inheriting the interface using implements:Next, create a class using implements after the class name Keyword, followed by the name of the interface to be inherited:

<code class="java">public class <class_name> implements <interface_name> {
    // 类的方法实现
}</code>

3. Implementing interface methods: In a class, all methods declared in the inherited interface must be implemented. The method signature (method name and parameter types) must exactly match the signature defined in the interface:

<code class="java">public class MyClass implements MyInterface {
    @Override
    public void myMethod1() {
        // 方法实现代码
    }

    @Override
    public int myMethod2() {
        return 10;
    }
}</code>

Example:

<code class="java">public interface Drawable {
    public void draw();
}

public class Circle implements Drawable {
    @Override
    public void draw() {
        System.out.println("Drawing a circle...");
    }
}</code>

In this example, Circle The class implements the Drawable interface. It implements a method called draw() which prints a message indicating that it is drawing a circle.

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