Minecraft-Server-Launcher/src/Main.java

import net.knarcraft.serverlauncher.server.*;

import java.io.FileNotFoundException;
import java.lang.Runtime;
import java.util.ArrayList;
import java.io.IOException;
//Java 9 required.

/**
 * A software for managing Minecraft servers.
 * @author Kristian Knarvik
 */
public class Main {
	private static ArrayList<Server> servers = new ArrayList<>();
	private static ArrayList<ServerType> serverTypes = new ArrayList<>();

	public static void main(String[] args) {
		addServerTypes();
	}

	// TODO: Add gui

	/**
	 * Adds all the valid server types and versions.
	 */
	private static void addServerTypes() {
		//This could be changed to read from a list which is downloaded to the user's computer.
		serverTypes.add(new ServerType("Vanilla", new String[]{"Latest", "1.12", "1.11.2", "1.10.2", "1.9.4", "1.8.9", "1.7.10", "1.6.4", "1.5.2", "1.4.7", "1.3.2", "1.2.5"}));
		serverTypes.add(new ServerType("Snapshot", new String[]{"Latest"}));
		serverTypes.add(new AdvancedServerType("SpongeVanilla", new String[]{"1.11.2", "1.10.2", "1.8.9"}, "https://dl-api.spongepowered.org/v1/org.spongepowered/spongevanilla/downloads?type=stable&minecraft=", "\"version\":\"", "\",", "https://repo.spongepowered.org/maven/org/spongepowered/spongevanilla/", "/spongevanilla-"));
		serverTypes.add(new ServerType("Spigot", new String[]{"1.12", "1.11.2", "1.10.2", "1.9.4", "1.9", "1.8.8", "1.7.10", "1.6.4", "1.5.2", "1.4.7"}));
		serverTypes.add(new ServerType("MCPCplus", new String[]{"1.6.4", "1.6.2", "1.5.2", "1.4.7"}));
		serverTypes.add(new ServerType("Craftbukkit", new String[]{"1.12", "1.11.2", "1.10.2", "1.9.4", "1.8.8", "1.7.10", "1.6.4", "1.5.2", "1.4.6", "1.3.2", "1.2.5", "1.1", "1.0"}));
		serverTypes.add(new ServerType("Custom", new String[]{""}));
	}

	/**
	 * Runs all enabled servers with their settings.
	 */
	public static void startServers() {
		//This should update the server status to running. The output should display in a custom commandline interface.
		for (Server server : servers) {
			if (server.isEnabled()) {
				String path = server.getPath();
				String type = server.getType();
				try {
                    server.downloadJar();
                } catch (FileNotFoundException e) {
					System.out.println("File was not found.");
					return;
				}
				String ram = server.maxRam();
				Runtime rt = Runtime.getRuntime();
				try {
					Process pr = rt.exec("java -Xmx" + ram + " -Xms512M -jar " + "\"" + path + "\\" + type + "\" nogui");
					long pid = pr.pid();
					server.updatePid(pid);
					System.out.println("Success");
				} catch (IOException e) {
					System.out.println("Error");
				}
			}
		}
	}
}