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src/main/java/de/jakob48/restartcountdown.java

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+package de.jakob48;
+
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.bukkit.scheduler.BukkitRunnable;
+
+public class restartcountdown extends JavaPlugin {
+
+    private BukkitRunnable countdownTask = null; // Referenz auf aktuellen Countdown
+
+    @Override
+    public void onEnable() {
+        getLogger().info("RestartCountdown Plugin aktiviert!");
+    }
+
+    @Override
+    public void onDisable() {
+        getLogger().info("RestartCountdown Plugin deaktiviert!");
+        if (countdownTask != null) countdownTask.cancel();
+    }
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        if (!command.getName().equalsIgnoreCase("restartserver")) return false;
+
+        if (args.length == 0) {
+            sender.sendMessage("§cVerwendung: /restartserver <Zeit> oder /restartserver stop");
+            return false;
+        }
+
+        if (args[0].equalsIgnoreCase("stop")) {
+            if (countdownTask != null) {
+                countdownTask.cancel();
+                countdownTask = null;
+                Bukkit.broadcastMessage("§cCountdown wurde gestoppt!");
+            } else {
+                sender.sendMessage("§cEs läuft kein Countdown!");
+            }
+            return true;
+        }
+
+        long seconds = parseTime(args[0]);
+        if (seconds <= 0) {
+            sender.sendMessage("§cUngültige Zeitangabe!");
+            return false;
+        }
+
+        sender.sendMessage("§aServerneustart in " + formatTime(seconds) + " gestartet!");
+        startCountdown(seconds);
+        return true;
+    }
+
+    private long parseTime(String input) {
+        try {
+            if (input.endsWith("s")) return Long.parseLong(input.replace("s", ""));
+            if (input.endsWith("m")) return Long.parseLong(input.replace("m", "")) * 60;
+            if (input.endsWith("h")) return Long.parseLong(input.replace("h", "")) * 3600;
+        } catch (NumberFormatException e) {
+            return -1;
+        }
+        return -1;
+    }
+
+    private void startCountdown(long seconds) {
+        if (countdownTask != null) countdownTask.cancel();
+
+        countdownTask = new BukkitRunnable() {
+            long timeLeft = seconds;
+
+            @Override
+            public void run() {
+                if (timeLeft <= 0) {
+                    Bukkit.broadcastMessage("§cServer wird jetzt neu gestartet!");
+                    Bukkit.shutdown();
+                    cancel();
+                    countdownTask = null;
+                    return;
+                }
+
+                if (timeLeft == seconds) {
+                    Bukkit.broadcastMessage("§eServerneustart in " + formatTime(timeLeft) + "!");
+                }
+                else if (timeLeft > 600 && timeLeft % 600 == 0) {
+                    Bukkit.broadcastMessage("§eServerneustart in " + formatTime(timeLeft) + "!");
+                }
+                else if (timeLeft <= 600 && timeLeft >= 60 && timeLeft % 60 == 0) {
+                    Bukkit.broadcastMessage("§eServerneustart in " + formatTime(timeLeft) + "!");
+                }
+                else if (timeLeft == 20) {
+                    Bukkit.broadcastMessage("§cServerneustart in 20 Sekunden!");
+                }
+                else if (timeLeft <= 10) {
+                    Bukkit.broadcastMessage("§cServerneustart in " + timeLeft + " Sekunden!");
+                }
+
+                timeLeft--;
+            }
+        };
+
+        countdownTask.runTaskTimer(this, 0, 20); // 20 Ticks = 1 Sekunde
+    }
+
+    private String formatTime(long seconds) {
+        long hours = seconds / 3600;
+        long minutes = (seconds % 3600) / 60;
+        long secs = seconds % 60;
+        StringBuilder sb = new StringBuilder();
+        if (hours > 0) sb.append(hours).append("h ");
+        if (minutes > 0) sb.append(minutes).append("m ");
+        if (secs > 0) sb.append(secs).append("s");
+        return sb.toString().trim();
+    }
+}

src/main/resources/plugin.yml

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+name: RestartCountdown
+version: 1.0
+main: de.jakob48.restartcountdown
+api-version: 1.20
+commands:
+  restartserver:
+    description: Startet einen Server-Neustart nach Countdown
+    usage: /restartserver <Zeit>
+    permission: restartserver.use
+permissions:
+  restartserver.use:
+    default: op