Java getting string from list with integers and strings

Question

I am trying to save the location of a player in minecraft to a list this works good but now how do I get my location back by searching trought the list on playerName?

Piece of code where the list class is created and the list

public static class Character {

    private String name;

    private Location location;
    public Character(String name, Location location) {
        this.name = name;
        this.location = location;
    }
}

public static class Location {
    private int x;
    private int y;
    private int z;

    public Location(int x, int y, int z) {
        this.x = x;
        this.y = y;
        this.z = z;
    }
}

List<Character> rawInput = new ArrayList<Character>();

piece of code where I add an item to the list :

else if (args[0].equalsIgnoreCase("select"))
{
    int tmpX = (int)player.getLocation().getX();
    int tmpY = (int)player.getLocation().getY();
    int tmpZ = (int)player.getLocation().getZ();
    rawInput.add(
        new Character( player.getName(), new Location( tmpX, tmpY, tmpZ )));
    player.sendMessage(
        ChatColor.GOLD + "[PlusCommands] " + ChatColor.GREEN
      + "selected location set to player location!");
}

This works all fine but how do I get the the data back for example :

This is a list with locations : Playername XYZ :

PlayerThree 32 13 46

PlayerTwo 12 60 212

PlayerOne 43 62 523

So I want to search for the right player in this example case I am PlayerOne So I want to get the data from the playerList where the string says PlayerOne

In this case thats this one : PlayerOne 43 62 523

How do I do this???

I hope I am clear enough sorry for it if not.

Answer 1

In place of List<Character> rawInput = new ArrayList<Character>(); use a Map<String,Character> rawInput = new LinkedHashMap<>();

To add a player:

rawInput.put( aNewCharacter.getName(), aNewCharacter );

You should check the returned value of put: if non null, the name is already used. Read the Javadoc of java.util.Map

To find a player:

Character c = rawInput.get( "PlayerOne" ); // returns PlayerOne 43 62 523

Answer 2

You need to add getters to these classes like so:

package com.sandbox;

public class Sandbox {

    public static void main(String[] args) {
        Character player = new Character("Foo", new Location(1, 2, 3));

        int tmpX = player.getLocation().getX();
        int tmpY = player.getLocation().getY();
        int tmpZ = player.getLocation().getZ();
    }

    public static class Character {

        private String name;
        private Location location;

        public Character(String name, Location location) {
            this.name = name;
            this.location = location;
        }

        public String getName() {
            return name;
        }


        public Location getLocation() {
            return location;
        }


    }

    public static class Location {
        private int x;
        private int y;
        private int z;

        public Location(int x, int y, int z) {
            this.x = x;
            this.y = y;
            this.z = z;
        }

        public int getX() {
            return x;
        }

        public int getY() {
            return y;
        }

        public int getZ() {
            return z;
        }
    }

}

Take note of my main . It shows that you don't need to cast to (int) .

Answer 3

static Map<String,Location> nameAndLocation = new HashMap<String, Location>();    

public Character(String name, Location location) {
            this.name = name;
            this.location = location;
            addToMap(this.name, this.location);
        }

public static void addToMap(String name, Location location) {
  nameAndLocation.put(name,location);
}

public static Location getLocation(String name) {
  return nameAndLocation.get(name);
}

Answer 4

This is some pretty messy code.

You shouldn't be creating your own Location or Player class, as Bukkit already includes one of each. Instead of making your own, use org.bukkit.util.Location + org.bukkit.entity.Player and you shouldn't have a problem!