private final val aaa: AtomicBoolean = new AtomicBoolean(false) final def setaaa(completed: Boolean): Unit = { aaa.set(completed) }

This code declares a private final variable named "aaa" of type AtomicBoolean and initializes it with a value of false. It also defines a final method named "setaaa" that takes a boolean parameter "completed" and sets the value of "aaa" to the value of "completed". The AtomicBoolean class is used to provide atomic operations on a boolean variable, ensuring thread safety.

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private final val aaa: AtomicBoolean = new AtomicBoolean(false)

This line of code declares a private final variable named "aaa" of type AtomicBoolean and initializes it to false. AtomicBoolean is a concurrency utility class that provides atomic operations on a boolean value. This means that multiple threads can safely read and modify the value of "aaa" without causing race conditions or other synchronization issues. The use of "private final" ensures that the variable can only be accessed within the current class and that its value cannot be changed once it has been initialized.