Quote from the software library attributable to Michael A Jackson?

While discussing modular software, a colleague recently suggested that the following quote (or similar words) is attributable to computer scientist Michael A Jackson. However, I can not find any reference to him on the Internet and I was wondering if anyone could point me to any of Jackson's works that contain it.

A library of software modules is the only type of library in which
Everyone wants to put something, and nobody wants to take something.
outside.

java – How to create a list of different classes in JACKSON

Good afternoon. I have been presented with the following incombeniente. I have a json structure which process in java with Jackson.

{
  "conditions": [
{
“operator”: “AND”,
“conditions”: [
{
“operator”: “IS_DESCENDANT”,
“value”: “a”
},
{
“operator”: “AND”,
“conditions” [
{}
]
}
      ]}
  ]}

On the one hand I have a conditions class and on the other a comparison. The problem arises when in a list I want to represent two different classes, as in the following case:

"conditions": [
{
“operator”: “IS_DESCENDANT”,
“value”: “a”
},
{
“operator”: “AND”,
“conditions” [
{}
]
}
]

How did I tell Jackson to put together a list with the two different classes? Thank you

If Samuel L. Jackson is in almost every movie, who would you say is the white version of Samuel L. Jackson?

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