I need help translating object code from JavaScript to Java

Question

The code of the javascript is this:

var Player = {name: "Player", health: 100};

function getValue(propName){ //propName is a string.
    return player[propName];
}

How would I implement this in Java by using classes rather than creating an object?

like I have some java code that looks like this:

public class Player(){
    public String name = "Player"
    public int health = 100;
}

and in another class, I would like to access those values by using strings like in javascript, so by doing Player["health"]

In java, you could use a Map<String, Object> to store player's properties. — Drogba
– Drogba, Commented Feb 24, 2014 at 8:24

radai · Accepted Answer · 2014-02-24 08:29:18Z

1

if you know in advance that name and health are the only attributes you want:

public class Player {
   private String name;
   private int health;

   public Player(String name, int health) {
      this.name = name;
      this.health = health;
   }

   public String getName() { return name; }

   public int getHealth() { return health; }
}

and then you can use this in code:

Player p = new Player ("john", 42);
System.out.println(p.getName() +"'s health is " + p.getHealth());

if you want to retain javascript's flexibility in defining extra attributes at runtime (note - this is considered bad practice in java, where type safety is a feature):

public class Player {
   private Map<String,Object> attributes = new HashMap<>();

   public void setAttribute(String name, Object value) {
      attributes.put(name,value);
   }

   public Object getAttribute(String name) {
      return attributes.get(name);
   }
}

and then:

Player p = new Player();
p.set("name","john");
p.set("health",42);
System.out.println(p.getAttribute("name") +"'s health is " + p.getAttribute("health"));

answered Feb 24, 2014 at 8:29

radai

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2 Comments

Corbbin Goldsmith Over a year ago

That looks feasible. Thank you so much for your quick response!

Corbbin Goldsmith Over a year ago

I think I'll be using the getHealth() method instead.

Saif Asif · Accepted Answer · 2014-02-24 08:25:47Z

0

How would I implement this in Java by using classes rather than creating an object?

Don't know what you mean by this?

I would like to access those values by using strings like in javascript, so by doing Player["health"]

This mostly means you want the Map notation. Take a look into Java maps, in particular this example here ...

answered Feb 24, 2014 at 8:25

Saif Asif

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Comments

Torben Rasmussen · Accepted Answer · 2014-02-24 08:27:45Z

0

You should implement Player as a POJO like this:

public class Player {
    private String name;
    private int health;

    public Player() {}
    public Player(String name, int health) {
        this.name = name;
        this.health = health;
    }
    public String getName() {
        return this.name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getHealth() {
        return this.health;
    }
    public void setHealth(int health) {
        this.health = health;
    }
}

answered Feb 24, 2014 at 8:27

Torben Rasmussen

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2 Comments

Corbbin Goldsmith Over a year ago

okay, but what I want is to be able to access the values no matter what type they are, be it a string or an int.

Torben Rasmussen Over a year ago

But that is not possible in Java because it is typesafe

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