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Questions - mutable

Why lower bound(<? super T>) is mutable and upper bound not (<? extends T>) in Java

I'm trying to understand Java Generic so I ended up with not able to understand why lower bound type can be mutable and upper bound types not. The example I have: List<? extends String> upperBou...
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Ahmad Alhaj-Karim

java

generics

immutability

mutable

Votes: 0

Answers: 0

Converting immutable to mutable map java

I have an immutable map that I get from the method in another part. And when processing I want to delete a key from it and then use it further, the key is always on the map. ImmutableMap<String...
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oescc

java

spring-boot

dictionary

immutability

mutable

Votes: 0

Answers: 1

Latest Answer

You can simply create a new HashMap from the existing Map using the copy constructor. HashMap<String, Object> = new HashMap<>(immutableMap); Note that this is a brand new object. There ...
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Stephen C

Are there caveats of using mutable types as default parameters in functions in Python?

I have recently read about mutable default parameters in Python. For some reason, I came up with an idea of using it like this: data = [3, 4, 1, 8, 5, 9, 2, 6, 7] def get_min(checked=[]): global...
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Oleksandr Novik

python

function

mutable

default-parameters

Votes: 0

Answers: 1

Latest Answer

The main caveat is that someone reading your code later, unless they're familiar with this particular gotcha, might not understand that checked persists, or that the caller isn't actually intended to ...
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Samwise

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