Menu
How many interfaces can a class file implement? Is there a limit on the number of interfaces used by a class file? Thanks in advance.
645
A class can implement more than one interface at a time. A class can extend only one class, but implement many interfaces. An interface can extend another interface, in a similar way as a class can extend another class.
The number of direct superinterfaces of a class or interface is limited to 65535 by the size of the interfaces_count item of the ClassFile structure. That is the only limitation.
However, whereas a class can extend only one other class, an interface can extend any number of interfaces. The interface declaration includes a comma-separated list of all the interfaces that it extends.
Yes, a class can implement multiple interfaces. Each interface provides contract for some sort of behavior.
But if you really really want to know the theoretical maximum number of interfaces a class can implement, it's 65535. Show activity on this post. From the Java VM Specification on Limitations of the JVM:
However, a class implements the interface. Consider the following image to understand the relationship between class and interface. Consider the following example to create an interface in java. In the following example, we will implement the multiple inheritance in java by using the interface.
In java, the interface keyword is used to declare the interface. Consider the following syntax to declare the interface. Like class, the interface can also inherit another interface. However, a class implements the interface.
An interface is different from abstract classes, i.e., an interface can't be instantiated, just like the abstract class. However, fields are static, public, and final in the interface, whereas; methods are public and abstract. There are the following reasons for which the interface is mainly used in java.
For all practical purposes, there is no limit on the number of interfaces a class can implement, but java does not let you inherit from multiple superclasses.
However, if you really want to nitpick, you can say that the number of interfaces a class can implement is bound by the maximum value the interface id can be in java bytecode, or the amount of code memory you have to implement these interfaces, or the amount of hard drive space to store your bytecode. These are silly arguments. Obviously, because your computer doesn't have infinite memory, infinite throughput, and infinite code space, we know that there are theoretical maximums on everything, just like how there's a theoretical maximum number of lines of code you can have in a single jar.
But if you really really want to know the theoretical maximum number of interfaces a class can implement, it's 65535.
126
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
