All Questions

I am having problems with this part of the code in which I have to delete an Arraylist line by entering a song using the keyboard and then search the Arraylist and if it finds said song then it deletes it. I'll pass you the main and the Playlist class so that you can take a look at it and you can help me to solve it, since personally I have been trying it by myself but there is no way to get it out

Playlist class

import java.util.ArrayList;
import java.util.Scanner;


public class Playlist {
    Scanner sc = new Scanner(System.in);
    private String nombrecancion;
    private String Artist;
    private String Genre;
    private int Year;


    /**
     * @param songName
     * @param artist
     * @param genre
     * @param year
     */

    private static ArrayList<Playlist> songs = new ArrayList<>();
    public Playlist(String nombrecancion, String Artist, String genre, int year) {
        this.nombrecancion = nombrecancion;
        this.Artist = Artist;
        this.Genre = genre;
        this.Year = year;

    }
    public Playlist(){

    }

     public static void addSong(String SongName, String Artist, String Genre, int Year) {
        songs.add(new Playlist(SongName, Artist, Genre, Year));
    }

    public  void deleteSong(String SongName, String Artist, String Genre, int Year){
        String cancion;
        System.out.println("Entra canción");
        cancion=sc.nextLine();

        boolean busqueda=songs.contains(cancion);

        songs.remove(SongName);


    }

    public static void listSong() {


            for (int i=0;i<songs.size();i++){
                System.out.println(songs.get(i));
            }
        }

    @Override
    public String toString() {
        return "Nombre de la cancion : " + nombrecancion + " Artista : " + Artist + " Género: " + Genre + " Año :"
                + Year + "";
    }

    public String getArtist() {
        return Artist;
    }

    public static void listmenu(){
        System.out.println("1.Add a new song to Playlist");
        System.out.println("2.Delete song from Playlist");
        System.out.println("3.List songs by artist");
        System.out.println("4.List top 5 songs with a specific hastag");
        System.out.println("5.Exit");
    }
}




Main

import java.util.InputMismatchException; import java.util.Scanner;

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

    boolean salida = false;
    int option;
    Scanner sc = new Scanner(System.in);
    Playlist playlist=new Playlist();
    String nombrecancion = null;
    String Artista = null;
    String Genero = null;
    int popular = 0;
    int Any = 0;
    String hastags = null;

    do {
        Playlist.listmenu();
        try {
            System.out.print("Please choose an option:");
            option = sc.nextInt();

            switch (option) {
                case 1:
                    System.out.print("SongName?:");
                    sc.nextLine();
                    nombrecancion = sc.nextLine();

                    System.out.print("Artist?:");
                    Artista = sc.nextLine();

                    System.out.print("Genre?:");
                    Genero = sc.nextLine();

                    System.out.print("Year?:");
                    Any = sc.nextInt();

                    Playlist.addSong(nombrecancion, Artista, Genero, Any);

                    System.out.println("How popular is this?[1-10]");
                    popular = sc.nextInt();

                    System.out.println("Add some hastags to the song: #w,#y : ");
                    sc.nextLine();
                    hastags = sc.nextLine();

                    System.out.println("You range is " + " " + popular + " And your hastags is " + " " + hastags);

                    break;
                case 2:
                    System.out.println("You choose delete song");
                    playlist.deleteSong();
                    break;
                case 3:
                    System.out.println("You choose List songs by artist");

                    String Artistas;

                    System.out.println("Enter an Artist");
                    Artistas=sc.nextLine();


                    Playlist.listSong();

                    break;
                case 4:
                    System.out.println("You choose List top 5 songs with a specific hastag");
                    break;
                case 5:
                    salida = true;
                    System.out.println("May the Music be with you");
                    break;
                default:
                    System.out.println("Only numbers from 1 to 5");
            }

        } catch (InputMismatchException e) {
            System.out.println("You need to enter an input");
            sc.next(); // Evitamos que entre en bucle
        }

    } while (!salida);
}}

One question, I want the css animation of this code to be made a thumbnail also when the mouse is removed from it, any suggestions?

Code:

  #projects img{
    height: 200px;
    width: 300px;
    margin: 0;
    border-radius: 5px;
}
    #projects img:hover{
        animation-name: animation;
        animation-duration: 1s;
        animation-timing-function: ease-in-out;
        animation-fill-mode:both;
}

@keyframes animation{
    10%{height: 200px;
        width: 300px;}
    50%{height: 300px; width:400px ; }
    100%{height: 300px; width:400px ;}
}

Hello good, I have a problem of black and white knights on how to move them in L position, in this code in each function it makes a turn of about 45° until the black and white pieces make a complete turn to the position in which they started , but using the way knights move in chess. This is the code I am using:

chessBoard = [["N", "▢", "N"], ["▢", "▢", "▢"], ["B", "▢", "B"]]

# def printBoard(columnList):
#    fila = len(columnList)
#    columna = len(columnList[0])
#    for i in range(fila):
#            for j in range(columna):
#                print(" {0} ".format(columnList[i][j]), sep=',', end='')
#            print('')


def rotar_matriz(matriz):
    rotada = []
    for i in range(len(matriz[0])):
        rotada.append([])
        for j in range(len(matriz)):
            rotada[i].append(matriz[len(matriz) - 1 - j][i])
    return rotada


print("\n-----------------------\n")
for fila in chessBoard:
    for e in fila:
        print(e, sep=",", end=" ")
print()
print("\n-----------------------\n")

rotada_1 = rotar_matriz(chessBoard)
for fila in rotada_1:
    for e in fila:
        print(e, sep=",", end=" ")
print()
print("\n-----------------------\n")

rotada_2 = rotar_matriz(rotada_1)
for fila in rotada_2:
    for e in fila:
        print(e, sep=",", end=" ")
print()
print("\n-----------------------\n")

rotada_3 = rotar_matriz(rotada_2)
for fila in rotada_3:
    for e in fila:
        print(e, sep=",", end=" ")
print()
print("\n-----------------------\n")

rotada_4 = rotar_matriz(rotada_3)
for fila in rotada_4:
    for e in fila:
        print(e, sep=",", end=" ")
print()
print("\n-----------------------\n")
print("\n***********************\n")
# printBoard(chessBoard)
print("\n***********************\n")

From this code you have the first N to move to the right 2 times then go down a 1 that would give in the L position, just as the white below the first black has to go up 2 times then go to the right in 1 that each piece is move in L to the right but don't be too close to the other glued together, like a square you turn it, a square rhombus appears, then you turn it again it's square again, you turn it again, a rhombus comes out, you turn it about 4 to 6 times in L each one without touching until they turn around

I try to do it this way but the date change does not work for me, if someone can help me

$originalDate = "19/10/2022";
$timestamp = strtotime($originalDate); 
$newDate = date("Y-m-d", $timestamp );
echo  $newDate;

I have this input that is to enter postal code but it is written in a way that only allows the entry of numbers and if you write letters it does not work, the problem is that it is written in the html and it looks horrible, I am trying to place the events on the side of the Js but I can't get them to work. What happens to them?

function alpha(e) {
    var k;
    document.all ? k = e.key : k = e.which;
    return (k == 189 || (k >= 48 && k <= 57));
}

<input type="tel" name="zipcode" id="zipcode" class="form-control" placeholder="Zip Code" required  onkeypress="return alpha(event);" oninput="javascript:
                            if(this.value.length>5){
                            var num_sf=this.value;
                            var num_cf=''
                            num_cf=num_sf.substring(0,5)
                            this.value=num_cf;
                            }" ontouchstart="this.removeAttribute('readonly');" onfocus="this.removeAttribute('readonly');" inputmode="tel" maxlength="5">

The code that I am using is this.

function alpha(e) {
    var k;
    document.all ? k = e.key : k = e.which;
    return (k == 189 || (k >= 48 && k <= 57));
}

const INPUT_ZIPCODE = document.getElementById('zipcode');
if (INPUT_ZIPCODE) {
    INPUT_ZIPCODE.addEventListener('touchstart', (e) => {
        e.target.removeAttribute('readonly');
    });
    INPUT_ZIPCODE.addEventListener('focus', (e) => {
        e.target.removeAttribute('readonly');
    });
    INPUT_ZIPCODE.addEventListener('input', (e) => {
        if(e.target.value.length>5){
            var num_sf=e.target.value;
            var num_cf=''
            num_cf=num_sf.substring(0,5)
            e.target.value=num_cf;
        }
    });
    INPUT_ZIPCODE.addEventListener('keypress', (e) => {
        return alpha(e);
    });
}

<input type="tel" name="zipcode" id="zipcode" class="form-control" placeholder="Zip Code" required inputmode="tel" maxlength="5">