How to understand the concept of rewriting in java

Rewriting concept:

Rewriting means that there are two names and parameter lists in the Java subclass and the parent class. same method. Since they have the same method signature, the new method in the subclass will override the original method in the parent class.

Rewriting conditions:

1. The parameter list of the overridden method must be completely the same as the parameter list of the overridden method. ;

2. The return type must be exactly the same as the return type of the overridden method;

3. The access level must not be more restrictive than that of the overridden method;

4. The access level can be less restrictive than that of the overridden method;

5. The overridden method must not throw a new checked exception or be broader than the checked exception declared by the overridden method. Checked exceptions;

6. Overridden methods can throw fewer or more limited exceptions (that is, the overridden method declares exceptions, but the overridden method can declare nothing );

7. Methods marked as final cannot be overridden;

8. If a method cannot be inherited, this method cannot be overridden.

Rewriting example:

Recommended tutorial: java tutorial

The above is the detailed content of How to understand the concept of rewriting in java. For more information, please follow other related articles on the PHP Chinese website!