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HiThereSally.java because the file name must exactly match the public class name (excepting the .java extension).
Only one public class
No other class can extend it.
Public and Abstract
Answer:
No other class can extend it.
EnumName.VALUE;
32 bits.
It prevents the field from being serialized as the JVM will skip it.
It indicates that a method can only be accessed by one thread at a time.
Answer:
It prevents the field from being serialized as the JVM will skip it.