Java -- rewrite and reload, Java -- rewrite and reload

Java -- rewrite and reload, Java -- rewrite and reload

Overload:

First, it must be in the same class or derived class.

The function names must be the same.

The parameter list must be different. The parameter list includes the parameter type, number of parameters, and Parameter order.

The return value type can be the same or different.

1 public void func () {} 2 public int func (int a, int B) {return 0;} 3 public void func (int a, String B) {} 4 public void func (String B, int ){}

Rewrite:

It must occur in a derived class and is used to override the parent class method by subclass.

The function names must be the same.

The parameter list must be the same.

The return value must be the same.

The access permission is not lower than the parent class and is not private or static.

The overwritten parent class method cannot be final.