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	public static void main(final String[] args) {
		final List<String> plateNumber = new ArrayList<String>(10);
		plateNumber.add("123");
 
		System.out.println("Plate Numbers to begin with: " + plateNumber.toString());
 
		while(true) {
			System.out.println("Enter your Plate Number : ");
			final Scanner pn = new Scanner(System.in);
			final String plateNumberxx = pn.nextLine();
 
			System.out.println("Log in / Log out: ");
			final Scanner YoN = new Scanner(System.in);
			final String des = YoN.nextLine();
 
			if(des.equals("log in")) {
				plateNumber.add(plateNumberxx);
				System.out.println("Plate Numbers after addition: " + plateNumber.toString()); //Added this to keep you updated.
			}
 
			if(des.equals("log out")){
				plateNumber.remove(plateNumberxx);
				System.out.println("Time log out : " + plateNumberxx + " ");
				System.out.println("Plate Numbers after removal: " + plateNumber.toString());
				break; //Only allows you to remove one plate number before the application stops.
			}
		}
	}

Main.java:1: error: class, interface, or enum expected
	public static void main(final String[] args) {
	              ^
Main.java:1: error: class, interface, or enum expected
	public static void main(final String[] args) {
	                              ^
Main.java:2: error: class, interface, or enum expected
		final List<String> plateNumber = new ArrayList<String>(10);
		      ^
Main.java:3: error: class, interface, or enum expected
		plateNumber.add("123");
		^
Main.java:5: error: class, interface, or enum expected
		System.out.println("Plate Numbers to begin with: " + plateNumber.toString());
		^
Main.java:7: error: class, interface, or enum expected
		while(true) {
		^
Main.java:9: error: class, interface, or enum expected
			final Scanner pn = new Scanner(System.in);
			      ^
Main.java:10: error: class, interface, or enum expected
			final String plateNumberxx = pn.nextLine();
			      ^
Main.java:12: error: class, interface, or enum expected
			System.out.println("Log in / Log out: ");
			^
Main.java:13: error: class, interface, or enum expected
			final Scanner YoN = new Scanner(System.in);
			      ^
Main.java:14: error: class, interface, or enum expected
			final String des = YoN.nextLine();
			      ^
Main.java:16: error: class, interface, or enum expected
			if(des.equals("log in")) {
			^
Main.java:18: error: class, interface, or enum expected
				System.out.println("Plate Numbers after addition: " + plateNumber.toString()); //Added this to keep you updated.
				^
Main.java:19: error: class, interface, or enum expected
			}
			^
Main.java:23: error: class, interface, or enum expected
				System.out.println("Time log out : " + plateNumberxx + " ");
				^
Main.java:24: error: class, interface, or enum expected
				System.out.println("Plate Numbers after removal: " + plateNumber.toString());
				^
Main.java:25: error: class, interface, or enum expected
				break; //Only allows you to remove one plate number before the application stops.
				^
Main.java:26: error: class, interface, or enum expected
			}
			^
18 errors

Standard output is empty