A class in java can inherit from several classes

In Java, a class can only inherit from one class. This is to avoid conflicts, simplify maintenance and follow the single responsibility principle. It supports indirect inheritance of multiple classes through multi-level inheritance, but each class can only directly inherit one parent class.

A class in Java can inherit from several classes

In Java, a class can only inherit from A class.

Cause:

• Avoid conflicts: If a class can inherit from multiple classes, there may be method or variable name conflicts, This leads to confusion and errors.
• Maintenance: Inheriting multiple classes will increase maintenance complexity because you need to ensure that all inherited classes are compatible.
• Single responsibility principle: Java follows the single responsibility principle, that is, a class should be responsible for only one task. By restricting inheritance to a class, you can keep the class's responsibilities clear and focused.

Multi-level inheritance:

Although Java does not allow direct inheritance of multiple classes, it supports indirect inheritance of multiple classes through multi-level inheritance. For example:

// 父类A
class A {
    // ...
}

// 子类B继承类A
class B extends A {
    // ...
}

// 子类C继承类B（间接继承类A）
class C extends B {
    // ...
}

In this example, class C indirectly inherits class A and class B. However, it can still only directly inherit from one class (i.e. class B).

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