Sorted:

What is the method for assigning values to a C language double pointer?

How to convert a map to JSON in Android?

How to change the IP address and gateway in Ubuntu?

How can file read and write operations be performed in Python?

How to apply for a second-level pointer in the C language?

How to set up JDK environment variables on CentOS?

How to resolve the issue of not being able to obtain an IP address via DHCP in Ubuntu?

What is the method for traversing a JSONObject in Android?

How to import and use modules and packages in Python?

What is the operation for string formatting in Python?