How to define interface in java

The way to define an interface in Java is: Interfaces are usually declared with the interface keyword. An interface is an abstract type in the Java language and a collection of abstract methods. Declaration syntax format: [[modifier] interface interface name {declared variable abstract method}].

Interface is an abstract type in the JAVA programming language and is a collection of abstract methods. Interfaces are usually declared with the interface keyword.

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A class inherits the abstract method of the interface by inheriting the interface.

The declaration syntax format of the interface is as follows:

[可见度] interface 接口名称 [extends 其他的接口名] {
        // 声明变量
        // 抽象方法}

Let’s take a look at an example:

/* 文件名 : Animal.java */
interface Animal {
    public void eat();   
    public void travel();
}

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The interface has the following characteristics:

• The interface is implicitly abstract. When declaring an interface, you do not need to use the abstract keyword.

• Every method in the interface is also implicitly abstract, and the abstract keyword is also not required when declaring it.

• The methods in the interface are all public.

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