How do I build a def loop in java?

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Java

Python2.7

Dear reader,

I am originally a python programmer, but for reasons I need to learn java. I am still learning and I make a lot of basic mistakes because I confuse myself from time to time with python, sorry for that. Below you are able to find a "text based adventure", I wrote this in python which worked great! but to learn java I am rewriting it in java, however I am having a hard time and I do not understand all the errors. I am used to make a def and let the python program loop through several until there is a break or exit (I call them def loops, but correct me if it is something else). I hope you are able to understand what I tried to do down below.

I am looking forward for a reply

-Sjoerd

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;

public class AppTest {
	
	public static void main(String[] args) {
	
		String[] tekendoos = new String[] {"ckv module"};
	
	
	public void Start(tekendoos) {
		System.out.println("[-De lift van WIM Inc.-]");
		System.out.println("1.) niveau 1 - Wims loerhokje");
		System.out.println("2.) niveau 2 - Juuls onderhoud station");
		System.out.println("3.) niveau 3 - Sjoerds archief");
		System.out.println("4.) niveau 4 - Adries gymzaal");
		System.out.println("5.) niveau 5 - Henks kantoor");
		System.out.println("6.) niveau 6 - Aula");
		
		List<String> cmdlist = Arrays.asList("1", "2", "3", "4", "5", "6");
		cmd = GetCmd(cmdlist);
		
		if (cmd.equals("1")) {
			System.out.println("test");
		}
		else if (cmd.equals("2")) {
			System.out.println("test");
		}
		else if (cmd.equals("3")) {
			System.out.println("test");
		}
		else if (cmd.equals("4")) {
			System.out.println("test");
		}
		else if (cmd.equals("5")) {
			System.out.println("test");
		}
		else if (cmd.equals("6")) {
			System.out.println("test");
		}
			
		
	}
	
	
	public void Onderhoud (tekendoos) {
		
	}
	
	public void GetCmd (cmdlist) {
		Scanner toetsenbord = new Scanner(System.in);
		String Help, Tekendoos, Stop;
		
		System.out.print("Sjoerd:> ");
		cmd = toetsenbord.next();
		
		if (Arrays.asList(cmdlist).contains(cmd)) {
			return cmd;			
		}
		
		else if (cmd.equalsIgnoreCase("help")) {
			System.out.println("typ: 'tekendoos' om te kijken wat je hebt");
			System.out.println("of 'stop' om op te geven, dan ben je echt zwak");
			System.out.println("of 'ckv module' om je geest op andere wezens aan te sluiten");
		}
		else if (cmd.equalsIgnoreCase("tekendoos")) {
			System.out.println("je bekijkt je tekendoos");
			System.out.println(Arrays.toString(tekendoos));
		}
		else if (cmd.equalsIgnoreCase("stop")) {
			System.out.println("Je benaderd het spoor");
			TimeUnit.SECONDS.sleep(2);
			System.out.println("Je ziet het gele licht");
			TimeUnit.SECONDS.sleep(2);
			System.out.println("Je kopt de trein");
			TimeUnit.SECONDS.sleep(2);
			System.out.println("Stef is trots");
			TimeUnit.SECONDS.sleep(2);
			System.exit();
		}
		
	}
	
} 

}

What I have tried:

I have read a lot of documentation but whenever I thought to fix it, I did some pythonic thing which only makes it worse.