How to convert String to Json

Question

I have a servlet in Java and I would like to know how I can do the following.

I have a String variable with the value of a name and want to create a Json with the v

Answer 1

The json library based on Map. So, put basically returns the previous value associated with this key, which is null, so null pointer exception.( http://docs.oracle.com/javase/1.4.2/docs/api/java/util/HashMap.html#put%28java.lang.Object,%20java.lang.Object%29)

You can rewrite the code as follows to resolve the issue.

JSONObject jsonObject1 = new JSONObject();
jsonObject1.put("name", "Hello, World");
String myString = jsonObject1.toString();