How many classes can a class inherit at most in Java?

A Java class can only directly inherit the data of one parent class, but can access the data of multiple parent classes through indirect inheritance.

How many classes of data can a Java class inherit?

In the Java language, a class can only inherit the data of one direct parent class, but it can indirectly inherit the data of multiple parent classes through the parent class.

Reason:

• Java uses a single inheritance model, that is, a class can only have one direct parent class.
• This design is to avoid ambiguity and complexity in diamond inheritance. Diamond inheritance is an inheritance relationship in which multiple classes inherit from the same parent class.

Indirect inheritance:

Although a class can only directly inherit the data of one parent class, it can indirectly inherit the data of multiple parent classes through the parent class. data. For example:

class A { ... }
class B extends A { ... }
class C extends B { ... }

In the above code, class C can access all variables and methods defined in classes A and B, even if class C does not directly inherit from class A.

Multiple interface implementation:

In Java, interfaces are not like classes and can implement multiple interfaces. Interfaces do not define implementations and therefore do not introduce diamond inheritance problems like class inheritance does. For example:

interface I1 { ... }
interface I2 { ... }
class D implements I1, I2 { ... }

In the above code, class D can implement and access all methods in interfaces I1 and I2.

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