Stringutils and collectionutils

1. String judgment tool （StringUtils）

// Determine if the string is null, or "". Be careful , String containing whitespace is not empty
boolean isEmpty(Object str)
// Determine whether the string ends with the specified content . Ignore case
boolean endsWithIgnoreCase(String str, String suffix)
// Determine whether the string has been specified at the beginning of the content . Ignore case
boolean startsWithIgnoreCase(String str, String prefix) 
// Whether to include blanks
boolean containsWhitespace(String str)
// Judge that the string is not empty and the length is not 0, namely ,Not Empty
boolean hasLength(CharSequence str)
// Determine whether the string contains the actual content , That is, not only white space characters , That is to say Not Blank
boolean hasText(CharSequence str)
// Determines whether a string contains a substring at the specified index .
boolean substringMatch(CharSequence str, int index, CharSequence substring)
// Calculate the number of occurrences of the stator string in a string
int countOccurrencesOf(String str, String sub)

2. Set judgment tool （CollectionUtils）

// Judge List/Set Is it empty
boolean isEmpty(Collection<?> collection)
// Judge Map Is it empty
boolean isEmpty(Map<?,?> map)
// Judge List/Set Whether there is an object in
boolean containsInstance(Collection<?> collection, Object element)
// In the form of iterators , Judge List/Set Whether there is an object in
boolean contains(Iterator<?> iterator, Object element)
// Judge List/Set Whether to include any one of some objects
boolean containsAny(Collection<?> source, Collection<?> candidates)
// Judge List/Set Whether each element in the is unique . namely List/Set There are no repeating elements in
boolean hasUniqueObject(Collection<?> collection)