Java Modifiers and inheritance

The member variables of a Java class typically have the following access modifiers:

Public, private, protected, or default,

For example, in package first, if there is a class FirstClass with four variables:

public int pp;

private int Xiaopp;

protected int DD;

int xiaodd;

If there is another class in package-Secondclass inherits FirstClass:

Then he will inherit the three variables in FirstClass, respectively:

public int pp;

protected int DD;

int xiaodd;

If a class Thirdclass inherits FirstClass in another package second,

Then he will inherit the two variables in FirstClass:

public int pp;

protected int DD;

From the example above we can see that the access modifiers are inherited by the relationship:

Public can be inherited by any subclass;

Protected although he would block access to classes outside the package, he would not block class inheritance outside of the package;

The default access modifier can only be accessed by classes within the same package, and it can only be inherited by subclasses of the same package;

Private access is limited to the same class and cannot be inherited.