Java StringJoiner Java added a new final class StringJoiner in java.util package. It is used to construct a sequence of characters separated by a delimiter. Now, you can create string by passing delimiters like comma(,), hyphen(-) etc. You can also pass prefix and suffix to the char sequence. StringJoiner Constructors
| Constructor |
Description |
| Public StringJoiner(CharSequence delimiter) |
It constructs a StringJoiner with no characters in it, with no prefix or suffix, and a copy of the supplied delimiter. It throws NullPointerException if delimiter is null. |
| Public StringJoiner(CharSequence delimiter,CharSequence prefix,CharSequence suffix) |
It constructs a StringJoiner with no characters in it using copies of the supplied prefix, delimiter and suffix. It throws NullPointerException if prefix, delimiter, or suffix is null. |
StringJoiner Methods
| Method |
Description |
| Public StringJoiner add(CharSequence newElement) |
It adds a copy of the given CharSequence value as the next element of the StringJoiner value. If newElement is null,"null" is added. |
| Public StringJoiner merge(StringJoiner other) |
It adds the contents of the given StringJoiner without prefix and suffix as the next element if it is non-empty. If the given StringJoiner is empty, the call has no effect. |
| Public int length() |
It returns the length of the String representation of this StringJoiner. |
| Public StringJoiner setEmptyValue(CharSequence emptyValue) |
It sets the sequence of characters to be used when determining the string representation of this StringJoiner and no elements have been added yet, that is, when it is empty. |
Java StringJoiner Example
Output:
Java StringJoiner Example: adding prefix and suffix
Output:
[Rahul,Raju,Peter,Raheem]
StringJoiner Example: Merge Two StringJoiner The merge() method merges two StringJoiner objects excluding of prefix and suffix of second StringJoiner object.
Output:
[Rahul,Raju,Peter:Raheem]
StringJoiner Example: StringJoiner Methods
Output:
It is empty
Rahul,Raju
Length: 10
Rahul,Raju
Character at index 3: u
Rahul,Raju,Sorabh
New Length: 17
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