Quick page lookup
×
JN1525-Strings
We can use either single- or double-quotes around strings:
Backslashes can escape other characters in Strings. We can use letter codes (eg '\b') or octal codes (eg '\010'):
To span multiple lines, use either triple quotes or a backslash at the end of the continuing lines to join them with the next:
We can also use three double-quotes.
When using double-quotes, either one or three, we can embed code within them using $. Here, they're called GStrings:
Anything more complex than a variable name must be surrounded by curlies:
We can change the variable's value in the GString:
String methods
We can convert other objects in Groovy to their string representation in different ways:
To find the size and substrings:
There's different ways to construct a string:
We can pad and center strings:
We can split a string into tokens:
Some additional methods:
We can use operators on strings:
We can subscript strings just as we can lists, except of course strings are read-only:
We can format values into a string, using format():
StringBuffers
A StringBuffer is a mutable string. (But from Java 5.0 onwards, we should use a StringBuilder instead, because StringBuffers are normally reserved for multi-threaded processing.)
To find the size and substrings:
To append to a StringBuffer:
If we append to a String, a StringBuffer is returned:
As with strings, we can subscript a StringBuffer, returning a string:
We can insert into, replace within, and delete from StringBuffers using methods:
We can find the index of substrings:
Some miscellaneous methods:
We can enquire of code points in a String or StringBuffer using methods on them, just as we can with methods on Character:
We can manipulate the implementation of a StringBuffer:
