Core - Dablakbandit

public class Example{

    // Firstly i recommend creating a method to send the JSONFormatter
    protected void send(JSONFormatter jf, Player player){
        // This allows the packets to go through
        PacketListener.getInstance().allow(player, jf.getSize());
        // This sends the packets
        jf.send(player);
    }

    // Another good method to have is one that stops chat packets from being
    // sent to the player
    protected void pause(Player player){
        PacketListener.getInstance().getListener().pause(player);
    }

    // And also one that restores the players chat after they have finished with
    // the gui
    protected void play(Player player){
        // This will resend the last 100 chat packets to player, if there is
        // only 50 to send,
        // then it will first send 50 blank packets
        PacketListener.getInstance().getListener().play(player);
    }

    // Basic send method
    public void send(Player player){
        // Whether newlines are enabled or not
        // Some minecraft version do not support new lines "\n"
        // It is best to have a setting in the config file to enable/disable this
        boolean newlines = false;
        JSONFormatter jf = new JSONFormatter(newlines);
 
        // Append a string
        // Some nice header
        jf.append("--------------");
        // This adds a new line
        jf.newLine();
        jf.append(" ");
 
        // Append a message with a click event
        // A click event is what happens when the player clicks it in their chat
        // There is RunCommandEvent or SuggestCommandEvent
        jf.appendClick(ChatColor.GREEN + "< Back", new RunCommandEvent("<command>" + " back"));
        jf.newLine();
        jf.newLine();
        jf.append(" " + ChatColor.RED + "Unsupported file");
 
        // There is also a hover event
        // There is ShowAchievementEvent, ShowItemEvent and ShowTextEvent
        jf.appendHover("Example", new ShowTextEvent("Hover"));
 
        // Resets just chat colors
        jf.resetColors();
        // Resets modifiers (italic, bold etc;)
        jf.resetModifiers();
        // Resets both, calling .newLine also resets all
        jf.resetAll();
 
        // Adds 15 blank lines
        // The Chat GUI can only be 20 lines high and you want it to be flush as to look nice
        jf.newLine(15);
        jf.append("--------------");
 
        // Calls the send method created earlier
        send(jf, player);
 
        // The JSONFormatter allows chaining which allows for very compact code
        jf.append("--------------").newLine()
        .append(" ").appendClick(ChatColor.GREEN + "< Back", new RunCommandEvent("<command>" + " back")).newLine().newLine()
        .append(" " + ChatColor.RED + "Unsupported file")
        .newLine(15)
        .append("--------------");
    }

}

This produces something like:

Example video: