How can a multi-dimensional object in JavaScript be translated into Java?

I'm working on an Android game and I need to store levels as a static Java class. Can anyone help me convert this Javascript object into Java code?

var Levels = {
Level1:{
    shapes:[
    {
        bodytype : "dynamic",
        h : "50.0000",
        nameid : "hofN7-1",
        props : {
            id : "properties"
        },
        rotation : "0.0000",
        type : "square",
        uid : "Av2EZQh",
        w : "50.0000",
        x : "20.0000",
        y : "20.0000"
    },
    {
        bodytype : "dynamic",
        h : "50.0000",
        nameid : "hofN7-2",
        props : {
            gravMassScale : "2",
            id : "properties",
            inertia : "2",
            isBullet : true,
            torque : "2",
            velocity : {
                x : "2",
                y : "2"
            }
        }
    }
...
javajavascriptandroid

Answer №1

For those seeking a structure similar to how JavaScript stores objects, consider using the JSONObject class:

Explore this link for more information: http://json.org/javadoc/org/json/JSONObject.html

Instead of focusing solely on syntax mapping, from an engineering standpoint, it may be beneficial to organize levels within a map of Levels like this:

HashMap<String, Level> myLevels = new HashMap<String, Level>();

Answer №2

One suggestion from the commenters is to utilize a Map in Java to create an object with different types of values. These values could range from Strings to arrays of objects or even nested Maps.

The drawback, however, is that you would need to use a Map<String, Object>, leading to cumbersome instanceof checks every time you interact with it.

An alternative approach is to leverage a JSON binding library like Jackson. By defining a class such as Levels and annotating its variables, Jackson can handle the conversion of instances to JSON and vice versa. This method requires knowledge of your class structure. Jackson also offers a mode using untyped maps.

Another option is to conceptualize Levels as a tree structure and implement the Composite pattern. This involves creating an abstract class like Node holding a name, with concrete subclasses including IntegerNode, StringNode, DoubleNode, MapNode, and ArrayNode.

Answer №3

Utilize this modified JSON structure to generate the corresponding classes by utilizing jsonschema2pojo:

{
  "Levels":{
    "shapes":[
    {
      "bodytype" : "dynamic",
      "h" : "50.0000",
      "nameid" : "hofN7-1",
      "props" : {
          "id" : "properties"
      },
      "rotation" : "0.0000",
      "type" : "square",
      "uid" : "Av2EZQh",
      "w" : "50.0000",
      "x" : "20.0000",
      "y" : "20.0000"
    },
    {
      "bodytype" : "dynamic",
      "h" : "50.0000",
      "nameid" : "hofN7-2",
      "props" : {
        "gravMassScale" : "2",
        "id" : "properties",
        "inertia" : "2",
        "isBullet" : "true",
        "torque" : "2",
        "velocity" : {
          "x" : "2",
          "y" : "2"
        }
      }
    }]
  }
}

Verify the conversion of the JSON and customize additional options according to your requirements. Feel free to download and incorporate the generated classes in your Java project.

Hopefully, this information proves beneficial for you. Cheers!

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