The core concept of Java: interface (interface)

The core concept of Java: interface (interface)

Interfaces are at the same level as classes, and in fact, interfaces are a special kind of abstract class.

Such as:

Interface ia{

}

Public interface: Open Interface

Similar to a class, a file can have only one public interface and is the same as the file name.

A public interface and a public class cannot be defined in a file at the same time.

In an interface, all methods are public, abstract, and all properties are public, static, and constant.

A class implements the format of an interface:

Class Iaimple implements ia{

};

A class implements an interface, which is equivalent to inheriting an abstract class.

1  PackageTomtext;2 //examples of the use of relational operators. 3  Public classtomtext_32 {4      Public Static voidMain (String args[]) {5     floatA =10.0f;6     Doubleb = 10.0;7     if(A = =b) {8System.out.println ("A and B are equal");9}Else{TenSystem.out.println ("A and b are not equal"); One } A } -  -}

The core concept of Java: interface (interface)