How to write B to inherit A in Java

In Java, use the extends keyword to indicate that B inherits A. The syntax is: class B extends A { // Contents of class B }.

The syntax in Java to indicate that B inherits A

In Java, use extends Keyword to indicate that B inherits A. The syntax is as follows:

<code class="java">class B extends A {
  // B 类的方法和属性
}</code>

Detailed explanation

In the above code:

• ##B is a subclass, which Inherits the A base class.
• A is a base class that provides methods and properties that subclasses can use. The
• extends keyword declares that B inherits from A.

Example

Let us consider a simple example:

<code class="java">class Animal {
  protected String name;
}

class Dog extends Animal {
  public void bark() {
    System.out.println("汪汪！");
  }
}</code>

In this example:

• Animal is the base class that defines the protected name field.
• Dog is a subclass that inherits from Animal and defines the bark() method.
• public void bark() method is used to make the dog bark.

In the

Dog class, it has access to the protected name field in the Animal class, and can call its own bark() method.

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