Thread: METHODS!!! HELP

Hi I'm new here I have a project due midnight and it'll be greatly appreciated if someone can help me with my code. For my code I have to make a game the game I'm making is war the project MUST be organized using method but everytime I try to make a method I get the follow errors on each of my methods except my main

HTML Code:

import java.util.ArrayList;
import java.util.Scanner;
import java.util.Random;
 
class warcardGame {
 
 public static void main(String[] args) {

   
   String line = "Welcome to my game of war. " + 
      "The rules of the game are simple " + 
      "Each player turns up a card at the same time and the player with the higher card takes both cards and puts them in their " +
      "respective decks"+
     " If the car1ds are the same rank , then another draw happens"+
      "The game is won when someone has ALL of the cards" + 
       "!!Aces are 14!!";
        
    
    System.out.println(line);
    
   
   Random generator = new Random();
  Scanner reader = new Scanner(System.in);
 
  ArrayList<String> deck = new ArrayList<String>();
  ArrayList<String> userhand = new ArrayList<String>();
  ArrayList<String> computerhand = new ArrayList<String>();
 
 
  public void randNum(){
  ArrayList<Integer> numbers = new ArrayList<Integer>();   
  Random randomGenerator = new Random();
  while (numbers.size() < 52) {
 
      int random = randomGenerator .nextInt(52);
      if (!numbers.contains(random)) {
          numbers.add(random);
      }
  }
 
  public void deckCards(){
  
  deck.add("Ace Of Hearts");
  deck.add("Ace Of Clubs");
  deck.add("Ace Of Spades");
  deck.add("Ace Of Diamonds");
  deck.add("2 of Hearts");
  deck.add("3 of Hearts");
  deck.add("4 of Hearts");
  deck.add("5 of Hearts");
  deck.add("6 of Hearts");
  deck.add("7 of Hearts");
  deck.add("8 of Hearts");
  deck.add("9 of Hearts");
  deck.add("10 of Hearts");
  deck.add("Jack of Hearts");
  deck.add("Queen of Hearts");
  deck.add("King of Hearts");
  deck.add("2 of Diamonds");
  deck.add("3 of Diamonds");
  deck.add("4 of Diamonds");
  deck.add("5 of Diamonds");
  deck.add("6 ofDiamonds");
  deck.add("7 ofDiamonds");
  deck.add("8 ofDiamonds");
  deck.add("9 ofDiamonds");
  deck.add("10 ofDiamonds");
  deck.add("Jack ofDiamonds");
  deck.add("Queen ofDiamonds");
  deck.add("King ofDiamonds");
  deck.add("2 of Clubs");
  deck.add("3 of Clubs");
  deck.add("4 of Clubs");
  deck.add("5 of Clubs");
  deck.add("6 of Clubs");
  deck.add("7 of Clubs");
  deck.add("8 of Clubs");
  deck.add("9 of Clubs");
  deck.add("10 of Clubs"); 
  deck.add("Jack of Clubs");
  deck.add("Queen of Clubs");
  deck.add("King of Clubs");
  deck.add("2 of Spades");
  deck.add("3 of Spades");
  deck.add("4 of Spades");
  deck.add("5 of Spades");
  deck.add("6 of Spades");
  deck.add("7 of Spades");
  deck.add("8 of Spades");
  deck.add("9 of Spades");
  deck.add("10 of Spades");
  deck.add("Jack of Spades");
  deck.add("Queen of Spades");
  deck.add("King of Spades");
 
  
     }
  }
public void dealCards(){
  for(int i = 0; i<deck.size()/2; i++){
   int firstnumber = numbers.get(i);
   String set = deck.get(firstnumber);
   userhand.add(set);
   }
}
 
 
  public void dealCardscpu(){
    for(int a = 0; a<deck.size(); a++){
     String checkword = deck.get(a);
     if(userhand.contains(checkword) == false)
      computerhand.add(checkword);
   }
  }
 
  public void warGamecards(){
  while(userhand.size()>0 && computerhand.size()>0){
 
   int l = generator.nextInt(userhand.size()-0);
   int p = generator.nextInt(computerhand.size()-0);
   String cardone = userhand.get(l);
   String cardtwo = computerhand.get(p);
 
   System.out.println("----------------------------------------------------------------------------------------------------------");
   System.out.println("Your : " + cardone);
   System.out.println("Computer Card: " + cardtwo);
   System.out.println("");
   System.out.println("You have " + userhand.size() + " cards.");
   System.out.println("The computer has " + computerhand.size() + " cards.");
   System.out.println("");
 
   System.out.println("If your card is bigger please enter 1.");
   System.out.println("If the computer card is bigger please enter 2.");
   System.out.println("If there is a tie enter 3.");
 
   System.out.print("Enter winner: ");
   int winner = reader.nextInt();
 
   if(winner == 1){
    userhand.add(cardtwo);
    computerhand.remove(p);
   }
 
   if(winner == 2){
    computerhand.add(cardone);
    userhand.remove(l);
   }
 
  }
 
 if(userhand.size() == 0){
   System.out.println("The computer has won the game.");
    System.out.println("THANKS FOR PLAYING");
      System.exit(0);
 }
 if(computerhand.size() == 0){
  System.out.println("You have won the game!!!! :)");
  System.out.println("THANKS FOR PLAYING");
  System.exit(0);
 
   }
 
 }
 
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