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Exercism exercises in Java.

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I noticed in the `squeaky-clean` problem, there's a test as follows: ```java // test/java/SqueakyCleanTest.java @Test public void string_with_no_letters() { assertThat(SqueakyClean.clean("\uD83D\uDE00\uD83D\uDE00\uD83D\uDE00")).isEmpty(); } ``` However, there's no corresponding [instruction](https://exercism.org/tracks/java/exercises/squeaky-clean) to remove "non-standard"...

good first issue
x:action/improve
x:knowledge/elementary
x:module/concept-exercise
x:type/content
x:size/small
action/stale

Would it be okay to add JavaDoc comments for the methods for the problems, like the JavaScript track has?

action/stale

I completed the bowling exercise but I found it a lot harder than all the previous exercises in the track. I can't imagine how it is for someone starting with...

good first issue
action/stale

_This issue is part of the migration to v3. You can read full details about the various changes [here](https://github.com/exercism/v3-launch/)._ Exercism v3 introduces a new type of exercise: [Concept Exercises](https://github.com/exercism/v3-docs/blob/main/product/concept-exercises.md). All...

v3-launch
x:action/improve
x:knowledge/intermediate
x:module/practice-exercise
x:type/content
x:size/large
action/stale

The exercise **react** has not been implemented yet for the Java track. The description of the exercise can be found in the [problem specification repository](https://github.com/exercism/problem-specifications/tree/master/exercises/react). How to implement a new...

enhancement
help wanted
implement exercise
action/stale

The exercise **dot-dsl** has not been implemented yet for the Java track. The description of the exercise can be found in the [problem specification repository](https://github.com/exercism/problem-specifications/tree/main/exercises/dot-dsl). How to implement a new...

help wanted
implement exercise
x:action/create
x:knowledge/intermediate
x:module/practice-exercise
x:type/content
x:size/medium

The exercise **ledger** has not been implemented yet for the Java track. The description of the exercise can be found in the [problem specification repository](https://github.com/exercism/problem-specifications/tree/master/exercises/ledger). How to implement a new...

enhancement
help wanted
implement exercise
action/stale

The exercise **lens-person** has not been implemented yet for the Java track. The description of the exercise can be found in the [problem specification repository](https://github.com/exercism/problem-specifications/tree/master/exercises/lens-person). How to implement a new...

enhancement
help wanted
implement exercise
action/stale

The exercise **pov** has not been implemented yet for the Java track. The description of the exercise can be found in the [problem specification repository](https://github.com/exercism/problem-specifications/tree/master/exercises/pov). How to implement a new...

enhancement
help wanted
implement exercise
action/stale

In the AffineCipher `README.md`, it states the value of `y` is the numeric value of an encrypted letter, ie. `y = E(x)`. Should `y = x`, where `x` is the...

action/stale