What is the difference between interface and class in java

The difference is as follows:

A class is not allowed to inherit multiple parent classes in Java, but it can be used to achieve "the function of one class inheriting multiple classes" Interface, a class implements multiple interfaces to indirectly implement multiple inheritance.

In essence, an interface is also an abstract class. This abstract class only contains definitions of constants and methods, but no implementation of variables and methods.

Multiple unrelated classes can implement the same interface. A class can implement multiple unrelated interfaces. Similar to the inheritance relationship, polymorphism exists between interfaces and implementation classes.

The interfaces provided by java are in the corresponding packages. You can use the interfaces provided by java by introducing the package. You can also define the interface yourself. A java source file is made of classes and interfaces.

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