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Recap - Validation Function

Part of the Fundamentals section of Coddy's Java journey — lesson 56 of 73.

Challenge

Easy

Write a method named is_valid that gets two strings arguments, username and password.

The method will return true if the username and password are valid in the system, otherwise false.

Our system contains only two valid usernames - "admin" and "user".

The valid password for username "user" is "qweasd".

For username "admin" any password is valid!

Try it yourself

import java.util.Scanner;

public class Main {
    public static boolean is_valid(String username, String password) {
        // Write your code below
        
    }
    
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String user = scanner.nextLine();
        String pass = scanner.nextLine();
        boolean res = is_valid(user, pass);
        System.out.println(res);
    }
}

All lessons in Fundamentals

1Introduction

Java Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Modulo Operator Increment/Decrement Post Increment/Decrement Arithmetic Shortcuts Comparison Operators String Comparison

7Basic IO

System.out Methods Formatting Output Scanner Class Recap - Till 120 Recap - True or False

10Methods (Functions)

Declaring Methods Method Parameters Return Types Method Overloading Recap - Sigma FunctionRecap - Validation FunctionVoid Methods

13String Operations

String Methods Part 1 String Methods Part 2 String Formatting String Comparison

2Variables Part 1

Numbers String Boolean char Type Declaration

5Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Logical Operators Part 4

8Calculator App

Welcome Message Getting Numbers

Project lesson

Basic Operations

Project lesson

Formatted Output

Project lesson

11Arrays Basics

Declaring Arrays Accessing Elements Modifying Arrays Array Methods Recap - Product Array Recap - Reversed Array

14Final Challenges

Number Pattern Pattern Finder Student Grade Calculator

3Variables Part 2

Constants Naming Conventions Recap - Initialize Variables Type Casting Part 1 Type Casting Part 2

6Decision Making

If Statement If - Else Switch Statement Ternary Operator Recap - If Else Nested If - Else

9Loops

For Loop Part 1 While Loop Do While Loop Break Continue For Loop Part 2 Nested Loop Infinite Loop Recap - Dynamic Input

12Iterating Over Arrays

Using For Loop Enhanced For Loop Common Array Operations