Hash Maps

public class tester {

    public static void main(String[] args) {
        System.out.println("Tester");
    }
}

import java.util.HashMap; // import the built-in hashMap for java 

public class HashMaps {
    
    public static void main(String[] args) {

        // instatiate "firstHash" object from the class "HashMap"
        // putting <dataType1, dataType2, etc...> explicitly tells the program what each value will be
        HashMap<String, Integer> firstHash = new HashMap<String, Integer>(); 

        // syntax: hashMapObject.put(key, value);
        // the "put(k, v)" method allows us to insert a specific key and its value in a map\
        // the key is just a name. value is the value of said name
        firstHash.put("a", 10);
        firstHash.put("b", 33);
        firstHash.put("c", 59);

        System.out.println(firstHash.get("c"));
    }
}

HashMaps.main(null);

59

import java.util.HashMap;

public class advancedHashMap {

        public static void main(String[] args) {

                // construct new "advancedHashMap" object from "HashMap" class
                HashMap<String, String> advancedHashMap = new HashMap<String, String>();

                advancedHashMap.put("Evan", "Password123");
                advancedHashMap.put("Calissa", "P@55w0rd123!");
                advancedHashMap.put("Kian", "myPassword");
                advancedHashMap.put("Samuel", "m13_p@55w0rd?!?");

                advancedHashMap.forEach((key, value) -> {
                        System.out.println("Username: " + key);
                        System.out.println("Password: " + value);
                        System.out.println();
                });

                System.out.println(advancedHashMap);
        }
}

advancedHashMap.main(null);

Username: Samuel
Password: m13_p@55w0rd?!?

Username: Kian
Password: myPassword

Username: Calissa
Password: P@55w0rd123!

Username: Evan
Password: Password123

{Samuel=m13_p@55w0rd?!?, Kian=myPassword, Calissa=P@55w0rd123!, Evan=Password123}

public class temp {

    public static void main(String[] args) {
        System.out.println("Test");
    }
}

Test