Java Language Tutorial => optXXX vs getXXX methods

Example

JSONObject and JSONArray have a few methods that are very useful while dealing with a possibility that a value your are trying to get does not exist or is of another type.

JSONObject obj = new JSONObject();
obj.putString("foo", "bar");

// For existing properties of the correct type, there is no difference
obj.getString("foo");        // returns "bar"
obj.optString("foo");        // returns "bar"
obj.optString("foo", "tux"); // returns "bar"

// However, if a value cannot be coerced to the required type, the behavior differs
obj.getInt("foo");      // throws JSONException
obj.optInt("foo");      // returns 0
obj.optInt("foo", 123); // returns 123

// Same if a property does not exist
obj.getString("undefined");        // throws JSONException
obj.optString("undefined");        // returns ""
obj.optString("undefined", "tux"); // returns "tux"

The same rules apply to the getXXX / optXXX methods of JSONArray.

PDF - Download Java Language for free

Previous Next

Java Language

Fastest Entity Framework Extensions

Example

Got any Java Language Question?

Java Language

Java Language JSON in Java optXXX vs getXXX methods

Fastest Entity Framework Extensions

Example

Got any Java Language Question?