Method overriding in Java
Method overriding is re-writing the implementation of a existing method of a parent class in subclass.
It provides specific implementation of a method in subclass which is already defined in super class.
Example
class Book{
void numberofpages(){
System.out.println("Book covers 250 pages.");
}
}
class Chapter extends Book{
void numberofpages(){
System.out.println("This Chapter covers 30 pages.");
}
public static void main(String args[]){
Chapter firstchap= new Chapter();
firstchap.numberofpages();
}
}
Try In EditorOutput
This Chapter covers 30 pages.
Rules for overriding a method
- Method name of subclass should be same as in superclass.
- Number of parameters of the overridden method in subclass should be same as its method in superclass
- datatype of the parameters of the overridden method in subclass should be same as its method in superclass.
- This is applicable only when it follows parent-child relationship i.e inherited