What am I doing wrong in this program $??$

$//$ShipDemo$.$java

package daway.s;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

public class ShipDemo

$\{$private static List ships $=$ new ArrayList$<>()$;

public static void main$($String$[]$ args$)$

$\{$Scanner input $=$ new Scanner$($System$.$in$)$;

int choice;

do

$\{$choice $=$ menu$($input$)$;

switch $($choice$)$

$\{$case $1$:

addShip$($input$)$;

break;

case $2$:

addCruiseShip$($input$)$;

break;

case $3$:

addCargoShip$($input$)$;

break;

case $-1$:

printShips$()$;

break;

default:

System.out.println$("$Invalid option. Please try again."$)$;$\}\}$

while $($choice $!=-1)$;$\}$

private static int menu$($Scanner input$)$

$\{$System$.$out.println$("**********$Menu$**********")$;

System.out.println$("$Enter $1$ for a Ship"$)$;

System.out.println$("$Enter $2$ for a Cruise Ship"$)$;

System.out.println$("$Enter $3$ for a Cargo Ship"$)$;

System.out.println$("$Enter $-1$ to exit"$)$;

System.out.print$("$Please enter your choice: $")$;

return input.nextInt$()$;$\}$

private static void addShip$($Scanner input$)$

$\{$System$.$out.print$("$Enter the name of the ship: $")$;

String name $=$ input.next$()$;

System.out.print$("$Enter the year the ship was built: $")$;

String year $=$ input.next$()$;

ships.add$($new Ship$($name$,$ year$))$;$\}$

private static void addCruiseShip$($Scanner input$)$

$\{$System$.$out.print$("$Enter the name of the cruise ship: $")$;

String name $=$ input.next$()$;

System.out.print$("$Enter the year the ship was built: $")$;

String year $=$ input.next$()$;

System.out.print$("$Enter the maximum number of passengers: $")$;

int passengers $=$ input.nextInt$()$;

ships.add$($new CruiseShip$($name$,$ year, passengers$))$;$\}$

private static void addCargoShip$($Scanner input$)$

$\{$System$.$out.print$("$Enter the name of the cargo ship: $")$;

String name $=$ input.next$()$;

System.out.print$("$Enter the year the ship was built: $")$;

String year $=$ input.next$()$;

System.out.print$("$Enter the cargo capacity in tons: $")$;

int tons $=$ input.nextInt$()$;

ships.add$($new CargoShip$($name$,$ year, tons$))$;$\}$

private static void printShips$()$

$\{$for $($Ship ship : ships$)$

$\{$System$.$out.println$($ship$)$;$\}\}$

$\}$

$\}$

$\}$

$//$CargoShip$.$java

package daway.s;

public class CargoShip

$\{$

public class CargoShip extends Ship

$\{$private int tons;

public CargoShip$($String name, String year, int tons$)$

$\{$super$($name$,$ year$)$;

this.tons $=$ tons;$\}$

public int getTons$()$

$\{$return tons;$\}$

public void setTons$($int tons$)$ C

$\{$this$.$tons $=$ tons;$\}$

@Override

public String toString$()$

$\{$return "Cargo Ship Name: $"+$ getName$()+",$ Cargo Capacity: $"+$ tons $+"$ tons";$\}$

$\}$

$//$CruiseShip$.$java

package daway.s;

public class CruiseShip

$\{$

public class CruiseShip extends Ship

$\{$private int passengers;

public CruiseShip$($String name, String year, int passengers$)$

$\{$super$($name$,$ year$)$;

this.passengers $=$ passengers;$\}$

public int getPassengers$()$

$\{$return passengers;$\}$

public void setPassengers$($int passengers$)$

$\{$this$.$passengers $=$ passengers;$\}$

@Override

public String toString$()$

$\{$return "Cruise Ship Name: $"+$ getName$()+",$ Passengers: $"+$ passengers;$\}$

$\}$

$//$Ship$.$java

package daway.s;

public class Ship

$\{$

public class Ship

$\{$private String name;

private String year;

public Ship$($String name, String year$)$

$\{$this$.$name $=$ name;

this.year $=$ year;$\}$

public String getName$()$

$\{$return name;$\}$

public void setName$($String name$)$

$\{$this$.$name $=$ name;$\}$

public String getYear$()$

$\{$return year;$\}$

public void setYear$($String year$)$

$\{$this$.$year $=$ year;$\}$

@Override

public String toString$()$

$\{$return "Ship Name: $"+$ name $+",$ Year: $"+$ year;$\}$

$\}$