Why do I use object1.optInt, object1.optString, and jsonobject1.optint during Json parsing?

Why do I use object1.optInt, object1.optString, and jsonobject1.optint during Json parsing?

When I was doing Json parsing today, a piece of code was not executed, so I found the cause:

1. The original code is:

A red sentence was not executed. An exception was found on the console.

 

2. Fix the bug. The correct code is

 

3. Summary

1. Our Parsing Method getString ("") is because this value does not exist in JSON, and an exception is reported, resulting in the following code not being executed.

2. I usually use the optString Method for security reasons. This method will not report exceptions.

3. If object1.optInt ("id") does not exist, 0 is returned.

Object1.optString ("mobile ")This value does not exist, and null is returned.