How do I correctly clone one json object to another .

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I am trying to copy one json say json1 to another json say json2. It seems values get overwrited ie., if am putting value in one key say key1 of json1. key1 value of json2 get overwritted.

What I have tried:

Works :
JSONObject json1 = new JSONObject();
json1.put("a",new JSONObject().put("c",1)).put("b","2");
JSONObject json2 = new JSONObject();
Iterator itr = json1.keys();//copying json from source to destinationJson
while(itr.hasNext()) {
String key = (String) itr.next();
json2.put(key, json1.get(key));
}
json1.put("b",3);
out.print("json1"+json1);
out.print("json2"+json2);

here , value b didnot get overwrite .

but if put value in c. It get overwritted. seems a of two jsons share same memory.

JSONObject subjson = json1.getJSONObject("a");
subjson.put("a",2);
out.print("json1"+json1);
out.print("json2"+json2);

So how can i solve it ? :( ..

Posted 17-May-17 4:31am

moyna coder

Updated 17-May-17 5:32am

v2

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Member 13136157 · Answer 1 · 2017-05-17T05:32:00

You talk about deep and shallow cloning. Here is more information. Understanding Object Cloning in Javascript - Part. I[^]

JavaScript

function naiveShallowCopy( original )  
{
    // First create an empty object
    // that will receive copies of properties
    var clone = {} ;

    var key ;

    for ( key in original )
    {
        // copy each property into the clone
        clone[ key ] = original[ key ] ;
    }

    return clone ;
}