Help me fix this code to run in java ONLY. This is a ecosystem game I created

public class Game $\{$

private boolean running;

private int water;

private int soilHealth;

private int biodiversity;

private int pollution;

private String currentScene;

$/**$

$*$ Constructor to initialize game state.

$*/$

public Game$()\{$

this.running $=$ true;

this.water $=100$;

this.soilHealth $=100$;

this.biodiversity $=100$;

this.pollution $=0$;

this.currentScene $=$ "MainMenu";

$\}$

$/**$

$*$ Starts the game loop.

$*/$

public void start$()\{$

Scanner scanner $=$ new Scanner$($System$.$in$)$;

while $($running$)\{$

switch $($currentScene$)\{$

case "MainMenu":

showMainMenu$()$;

break;

case "ResourceManagement":

showResourceManagement$()$;

break;

case "EcosystemStatus":

showEcosystemStatus$()$;

break;

case "Exit":

exit$()$;

return;

default:

System.out.println$("$Unknown scene: $"+$ currentScene$)$;

running $=$ false;

return;

$\}$

int choice $=$ scanner.nextInt$()$;

handleChoice$($choice$)$;

$\}$

scanner.close$()$;

$\}$

$/**$

$*$ Displays the main menu.

$*/$

private void showMainMenu$()\{$

System.out.println$("$Welcome to EcoGame"$)$;

System.out.println$("1.$ Manage Resources"$)$;

System.out.println$("2.$ Check Ecosystem Status"$)$;

System.out.println$("3.$ Exit"$)$;

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

$\}$

$/**$

$*$ Handles the user's choice at the main menu.

$*$

$*$ @param choice the user's menu choice

$*/$

private void handleChoice$($int choice$)\{$

switch $($currentScene$)\{$

case "MainMenu":

switch $($choice$)\{$

case $1$:

currentScene $=$ "ResourceManagement";

break;

case $2$:

currentScene $=$ "EcosystemStatus";

break;

case $3$:

currentScene $=$ "Exit";

break;

default:

System.out.println$("$Invalid choice. Please try again."$)$;

$\}$

break;

case "ResourceManagement":

manageResources$($choice$)$;

break;

case "EcosystemStatus":

currentScene $=$ "MainMenu";

break;

$\}$

$\}$

$/**$

$*$ Displays the resource management scene.

$*/$

private void showResourceManagement$()\{$

System.out.println$("$Manage Resources:"$)$;

System.out.println$("1.$ Add Water"$)$;

System.out.println$("2.$ Improve Soil Health"$)$;

System.out.println$("3.$ Promote Biodiversity"$)$;

System.out.println$("4.$ Reduce Pollution"$)$;

System.out.println$("5.$ Return to Main Menu"$)$;

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

$\}$

$/**$

$*$ Manages resources based on the user's choice.

$*$

$*$ @param action the user's resource management choice

$*/$

private void manageResources$($int action$)\{$

switch $($action$)\{$

case $1$:

water $+=10$;

System.out.println$("$You added water. Water level increased by $10.")$;

break;

case $2$:

soilHealth $+=10$;

System.out.println$("$You improved soil health. Soil health increased by $10.")$;

break;

case $3$:

biodiversity $+=10$;

System.out.println$("$You promoted biodiversity. Biodiversity increased by $10.")$;

break;

case $4$:

pollution $-=10$;

System.out.println$("$You reduced pollution. Pollution decreased by $10.")$;

break;

case $5$:

currentScene $=$ "MainMenu";

return;

default:

System.out.println$("$Invalid action. Please try again."$)$;

$\}$

System.out.println$("$Resource management complete."$)$;

$\}$

$/**$

$*$ Displays the ecosystem status.

$*/$

private void showEcosystemStatus$()\{$

System.out.println$("$Ecosystem Status:"$)$;

System.out.println$("$Water: $"+$ water$)$;

System.out.println$("$Soil Health: $"+$ soilHealth$)$;

System.out.println$("$Biodiversity: $"+$ biodiversity$)$;

System.out.println$("$Pollution: $"+$ pollution$)$;

System.out.println$("$Press any key to return to the main menu."$)$;

$\}$

$/**$

$*$ Handles game events $($placeholder for future event logic$).$

$*/$

private void handleEvents$()\{$

$//$ Placehold