I stumbled across this awesome resource by @RichardB122, and it just needed a small change to work without a deprication warning in Java 9+. I also fixed a bug that @Jmbeard96 pointed out in the comments of the original Gist that the class cannot set the value of 351 XP due to an unhandled case in the if statements. I hope this is useful to someone - it's definitely been useful to me in my personal plugin!
-Ash
| /* | |
| AUTHOR: Dev_Richard (https://www.spigotmc.org/members/dev_richard.38792/) | |
| DESC: A simple and easy to use class that can get and set a player's total experience points. | |
| Feel free to use this class in both public and private plugins, however if you release your | |
| plugin please link to this gist publicly so that others can contribute and benefit from it. | |
| Updated by Asheiou (https://github.com/Asheiou) the 26th May 2025 to: | |
| - Remove deprecated functions in Java 9+ | |
| - Fix a bug where 351 XP was not a valid value to set | |
| */ | |
| import java.math.BigDecimal; | |
| import java.math.RoundingMode; | |
| import org.bukkit.entity.Player; | |
| public class ExperienceManager { | |
| private Player player; | |
| public ExperienceManager(Player player) { | |
| this.player = player; | |
| } | |
| public int getTotalExperience() { | |
| int experience = 0; | |
| int level = player.getLevel(); | |
| if(level >= 0 && level <= 15) { | |
| experience = (int) Math.ceil(Math.pow(level, 2) + (6 * level)); | |
| int requiredExperience = 2 * level + 7; | |
| double currentExp = Double.parseDouble(Float.toString(player.getExp())); | |
| experience += Math.ceil(currentExp * requiredExperience); | |
| return experience; | |
| } else if(level > 15 && level <= 30) { | |
| experience = (int) Math.ceil((2.5 * Math.pow(level, 2) - (40.5 * level) + 360)); | |
| int requiredExperience = 5 * level - 38; | |
| double currentExp = Double.parseDouble(Float.toString(player.getExp())); | |
| experience += Math.ceil(currentExp * requiredExperience); | |
| return experience; | |
| } else { | |
| experience = (int) Math.ceil(((4.5 * Math.pow(level, 2) - (162.5 * level) + 2220))); | |
| int requiredExperience = 9 * level - 158; | |
| double currentExp = Double.parseDouble(Float.toString(player.getExp())); | |
| experience += Math.ceil(currentExp * requiredExperience); | |
| return experience; | |
| } | |
| } | |
| public void setTotalExperience(int xp) { | |
| //Levels 0 through 15 | |
| if(xp >= 0 && xp < 352) { | |
| //Calculate Everything | |
| int a = 1; int b = 6; int c = -xp; | |
| int level = (int) (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a); | |
| int xpForLevel = (int) (Math.pow(level, 2) + (6 * level)); | |
| int remainder = xp - xpForLevel; | |
| int experienceNeeded = (2 * level) + 7; | |
| float experience = (float) remainder / (float) experienceNeeded; | |
| experience = round(experience, 2); | |
| System.out.println("xpForLevel: " + xpForLevel); | |
| System.out.println(experience); | |
| //Set Everything | |
| player.setLevel(level); | |
| player.setExp(experience); | |
| //Levels 16 through 30 | |
| } else if(xp >= 352 && xp < 1507) { | |
| //Calculate Everything | |
| double a = 2.5; double b = -40.5; int c = -xp + 360; | |
| double dLevel = (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a); | |
| int level = (int) Math.floor(dLevel); | |
| int xpForLevel = (int) (2.5 * Math.pow(level, 2) - (40.5 * level) + 360); | |
| int remainder = xp - xpForLevel; | |
| int experienceNeeded = (5 * level) - 38; | |
| float experience = (float) remainder / (float) experienceNeeded; | |
| experience = round(experience, 2); | |
| System.out.println("xpForLevel: " + xpForLevel); | |
| System.out.println(experience); | |
| //Set Everything | |
| player.setLevel(level); | |
| player.setExp(experience); | |
| //Level 31 and greater | |
| } else { | |
| //Calculate Everything | |
| double a = 4.5; double b = -162.5; int c = -xp + 2220; | |
| double dLevel = (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a); | |
| int level = (int) Math.floor(dLevel); | |
| int xpForLevel = (int) (4.5 * Math.pow(level, 2) - (162.5 * level) + 2220); | |
| int remainder = xp - xpForLevel; | |
| int experienceNeeded = (9 * level) - 158; | |
| float experience = (float) remainder / (float) experienceNeeded; | |
| experience = round(experience, 2); | |
| System.out.println("xpForLevel: " + xpForLevel); | |
| System.out.println(experience); | |
| //Set Everything | |
| player.setLevel(level); | |
| player.setExp(experience); | |
| } | |
| } | |
| private float round(float d, int decimalPlace) { | |
| BigDecimal bd = new BigDecimal(Float.toString(d)); | |
| bd = bd.setScale(decimalPlace, RoundingMode.HALF_DOWN); | |
| return bd.floatValue(); | |
| } | |
| } |