JavaScript String Manipulation Quiz

9 Questions

fruit.substring(2, 5)

raw

fruit.substring(0, 3)

str

fruit.substring(5, 10)

berries

fruit.substring(2, 5)

raw

Which of the following substrings would fruit.substring(3, 6) return from the string 'strawberries'?

wber

What would fruit.substring(0, 9) return from the string 'strawberries'?

strawberr

Which one of the following methods allows you to achieve runtime polymorphism in Java?

Method overriding

What is the purpose of method overloading in Java?

To create multiple methods with the same name but different parameters

What is the difference between method overloading and method overriding in Java?

Method overloading allows you to create multiple methods with the same name but different parameters, while method overriding allows you to provide a different implementation of a method in a subclass that is already defined in its superclass.

Study Notes

String Substring Method

fruit.substring(2, 5) would return a substring from index 2 to 4 (exclusive) of the string 'strawberries'.
fruit.substring(0, 3) would return a substring from index 0 to 2 (exclusive) of the string 'strawberries'.
fruit.substring(5, 10) would return a substring from index 5 to 9 (exclusive) of the string 'strawberries'.
fruit.substring(2, 5) would return a substring from index 2 to 4 (exclusive) of the string 'strawberries'.

Substring Method Examples

fruit.substring(3, 6) would return 'raw' from the string 'strawberries'.
fruit.substring(0, 9) would return 'strawber' from the string 'strawberries'.

Java Method Polymorphism

Runtime polymorphism in Java can be achieved using method overriding.
Method overloading allows multiple methods with the same name to be defined, as long as they have different parameter lists.
Method overriding is a feature that allows a subclass to provide a specific implementation for a method that is already defined in its superclass.
The main difference between method overloading and method overriding is that overloading is used to provide multiple definitions for a method with the same name, whereas overriding is used to provide a specific implementation for a method that is already defined in a superclass.