Android: JSON string data compare with other string

Question

I would like to compare string from mysql database using JSON with my string. I recieved data from database and Log shows that I have all data.

try{
     JSONArray jArray = new JSONArray(result);
     for(int i=0;i<jArray.length();i++){
         json_data = jArray.getJSONObject(i);
         Log.i("mylog","TABLE_NAME: "+json_data.getString("table_name"));//returns cars

         if (  json_data.getString("table_name") == "cars" ) { //dosent work
              .... 
         }
     }
} catch(JSONException e){
         Log.e("mylog", "Error parsing data "+e.toString());
     return false;
}

and in this example in Log I recieved name of table: cars And below IF condition doesnt work and I have no idea WHY. It is strange. I've tried many ways.

Do you know what is the reason why I cannot compare table_name from JSON with simple String?

Samir Mangroliya · Accepted Answer · 2012-05-06 14:36:43Z

8

Use .equals() for compare two strings in java/android.

if (json_data.getString("table_name").equals("cars")) {  

         }

it compare Strings refrence so cant work...

when You use String literal then use ==

and == only for primitive data types and here String is Object So use .equals

answered May 6, 2012 at 14:36

Samir Mangroliya

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2 Comments

Tom B Over a year ago

Thank you :) I just figure out this solution on other thread :)

Samir Mangroliya Over a year ago

what happens ? whats problem now?

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