What is a faster method of checking to see if a new element already exists in a collection than using the equals() method on each element?
Answer: Use the hashCode() element on all members of the collection, sorting all elements with equal hashes in a single bucket. If the hash of a new element matches that of an existing bucket, the equals() method can be used on all the contents of the bucket.
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Data Structures
- What is the general function of the Period and Duration classes?
- What is the general function of the LocalDateTime class?
- What is the general function of the LocalTime class?
- What is the output of the following code?
- What is the function of the of() methods and the ofYearDay() method of the LocalDate class?
- What is the function of the parse(CharSequence text) and parse(CharSequence text, DateTimeFormatter formatter) methods of the LocalDate class?
- What is the general purpose of the LocalDate class?
- What is the function of the max(), min(), median(), and mode() methods of the ObjectUtils class?
- What is the function of the firstNotNull() and defaultIfNull() methods of the ObjectUtils class?
- What is the function of the allNotNull() and anyNotNull() methods of the ObjectUtils class?
- What is the function of the identityToString() series of methods of the ObjectUtils class?
- What is the function of the notNull() method of the ObjectUtils class?
- What is the function of the toString(Object o) and toString(Object o, String nullDefault) methods of the Objects class?
- What is the function of the compare(T a, T b, Comparator c) method of the Objects class?
- What is the output of the following code segment?
- What two classes are useful resources for Object Utilities.
- What is the function of the stream() method from the java.util.Arrays class?
- What is the function of the splitIterator() method from the java.util.Arrays class?
- What is the function of the sort() and parallelSort() methods from the java.util.Arrays class?
- What is the function of the fill(), setAll(), parallelPrefix(), and parallelSetAll() methods from the java.util.Arrays class?
- What is the function of the toString() and deepToString() methods from the java.util.Arrays class?
- What is the function of the hashCode() and deepHashCode() methods from the java.util.Arrays class?
- What is the function of the copyOf() and copyOfRange() methods from the java.utils.Arrays class?
- What is the function of the compare(), mismatch(), equals() and deepEquals() methods from the java.util.Arrays class?
- What is the function of the binarySearch() method from the java.util.Arrays class?
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