Array notation with Salesforce Apex

Question

In Salesforce Apex, I'm trying to create a multi-dimensional array that I can later serialize into JSON.

In PHP I would do it as such:

$form['fields'][$element[1]][$element[2]] = $data;

But I can't seem to find a way to easily do this with Apex...can anyone guide me in the right direction?

Daniel Ballinger · Accepted Answer · 2015-03-20 07:24:08Z

1

You can have a List of Lists in Apex. This allows you to create jagged arrays (as you need to ensure the each sub list is of the required size).

List<List<String>> fruit = new List<List<String>> {
    new List<String>{'banana', 'apple', 'pear'},
    new List<String>{'grape', 'tomato', 'orange'},
    new List<String>{'peach', 'plum', 'strawberry'}
};

System.debug(fruit[1][2]);

You may also want to consider a Map<String, List<String>> if you want to find sub lists by key.

answered Mar 20, 2015 at 7:24

Daniel Ballinger

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1 Comment

Alix Ohrt Over a year ago

So in my case I am looping through form input in the apex controller and compiling these arrays. So I need to be able to add key/value pairs based on a label. So how do I had directly onto a list in the map you provided given a string for the parameter?

Alix Ohrt · Accepted Answer · 2015-03-20 16:55:57Z

1

Thing I got it sorted after using the following code:

Map<String, Map <String, String>> fieldsMap = new Map<String, Map <String, String>>();

if(fieldsMap.containsKey(keyArray[1])){
    fieldsMap.get(keyArray[1]).put(keyArray[2], m.get(key));
}

else {
     Map<String,String> newMap = New Map<String,String>();
     newMap.put(keyArray[2], m.get(key));

     fieldsMap.put(keyArray[1], newMap);
}

Thanks for pointing me in the right direction Daniel!

answered Mar 20, 2015 at 16:55

Alix Ohrt

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