JSONArray remove cannot find symbol error in JAVA

Question

[Description]
1. Using Java
2. Use org.json.JSONArray and org.json.JSONObject
[Problem]
When I call JSONArray's remove() method, always get "cannot find symbol: method remove(int)" when compile my project, any help for this?

Here is a similar question: How to remove JSONArray element using Java
but the answer seems not correct, because that will just remove the inside JSONObject's key-value pair but not the whole insinde JSONObject.

Example code:

JSONArray test_arr = new JSONArray("[{'id':'1', 'name': 'name1'},{'id':'2', 'name':'name2'}]");
test_arr.remove(1);  // here will cause the "cannot find symbol" error.

Thanks in advance for any help.

Are you using (say) an old version of the lib that doesn't have that particular method ? — Brian Agnew
– Brian Agnew, Commented Jan 31, 2013 at 12:49
[Check this][1] Its may Helpful to You... Remove json array using name-value [1]: stackoverflow.com/questions/6310623/… — Pratik Butani
– Pratik Butani, Commented Jan 31, 2013 at 12:51
[to Brian] I checked the jar file which I use, it do has remove method. [to Pratik] Thanks, but I said I use java, not javascript. — ZZ Shao
– ZZ Shao, Commented Jan 31, 2013 at 13:01
Hmmm, the remove(int) method has been in the codebase since the very first commit. This has to be an error in how you included the code into your project. — Perception
– Perception, Commented Jan 31, 2013 at 13:02
[to Perception] I use java, so ==> include "org.json.jar" in library path, and "import org.json.JSONArray;" in code. Other functions of this class works well in my project, but only this remove() function. — ZZ Shao
– ZZ Shao, Commented Jan 31, 2013 at 13:03

Perception · Accepted Answer · 2013-01-31 14:36:29Z

2

Well, interestingly, the latest org.json JAR in Maven central indeed contains a JSONArray class that does not have a remove method. This is an extract of javap on the class, as extracted from json-20090211.jar:

public org.json.JSONArray put(int, long) throws org.json.JSONException;
public org.json.JSONArray put(int, java.util.Map) throws org.json.JSONException;
public org.json.JSONArray put(int, java.lang.Object) throws org.json.JSONException;
public org.json.JSONObject toJSONObject(org.json.JSONArray) throws org.json.JSONException;
public java.lang.String toString();
public java.lang.String toString(int) throws org.json.JSONException;
java.lang.String toString(int, int) throws org.json.JSONException;
public java.io.Writer write(java.io.Writer) throws org.json.JSONException;

This compiled code is inconsistent with the source code available from the official JSON.org site, so I would not use it. The library is so dead simple, I would recommend simply grabbing the source yourself and either:

compiling it into a JAR
including it directly into your project.

answered Jan 31, 2013 at 14:36

Perception

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ZZ Shao Over a year ago

Thanks Perception. In my project, i decompile the org.json.jar, it DO has a remove() method. Have no idea about why got this "cannot find symbol" error. Now I use ArrayList<JSONObject> instead of JSONArray, then I can use ArrayList's remove() method. Thanks again for your help and advice.

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