Best Groovy Programming Books to Buy in February 2026
Groovy in Action: Covers Groovy 2.4
Programming Groovy 2: Dynamic Productivity for the Java Developer (Pragmatic Programmers)
Making Java Groovy
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Groovy Programming: An Introduction for Java Developers
Programming Groovy: Dynamic Productivity for the Java Developer (The Pragmatic Programmers)
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Groovy: Grundlagen und fortgeschrittene Techniken (German Edition)
To grab a substring in Groovy, you can use the substring() method on a String. This method takes in two parameters: the start index and the end index of the substring you want to extract. Keep in mind that Groovy uses a zero-based index, meaning the first character in the string is at index 0.
Here is an example of how you can grab a substring in Groovy:
def originalString = "Hello, World!" def startIndex = 7 def endIndex = 12
def substring = originalString.substring(startIndex, endIndex)
println(substring) // Output: World
In this example, we start grabbing the substring from index 7 (inclusive) to index 12 (exclusive) from the original string "Hello, World!". The substring variable will then contain the value "World". You can adjust the start and end indexes as needed to grab different parts of the original string.
What is the behavior of slicing a string to get a substring in Groovy?
In Groovy, you can slice a string to get a substring by using the subscript operator ([]). When slicing a string, you can specify the starting and ending index to extract a part of the original string.
The syntax for slicing a string in Groovy is as follows:
String slicedString = originalString[startIndex..endIndex]
This will extract a substring from the original string starting from the startIndex index up to (but not including) the endIndex index.
For example:
def originalString = "Groovy is awesome!" def slicedString = originalString[0..5] println slicedString
This will output:
Groovy
You can also omit the endIndex to slice the string starting from the startIndex index to the end of the string, like this:
String slicedString = originalString[startIndex..]
Keep in mind that in Groovy, string indices are zero-based.
How to extract a substring between two specified indexes in Groovy?
You can extract a substring between two specified indexes in Groovy using the substring method. Here's an example:
def originalString = "Hello, World!" def startIndex = 7 def endIndex = 12
def extractedString = originalString.substring(startIndex, endIndex)
println(extractedString) // Output: World
In this example, we have a original string "Hello, World!" and we want to extract a substring between indexes 7 and 12. The substring method takes two arguments - the start index and the end index (exclusive) of the substring. The extracted string will be "World" in this case.
What is the technique for extracting a substring based on a specific pattern in Groovy?
In Groovy, you can use regular expressions to extract a substring based on a specific pattern. You can use the find method on a String variable with a regular expression pattern as an argument to extract the substring.
Here's an example:
def text = "The quick brown fox jumps over the lazy dog" def pattern = ~/quick\s\w+\s\w+/
def match = text.find(pattern)
if (match) { println("Match found: ${match}") } else { println("No match found") }
In this example, the regular expression pattern ~/quick\s\w+\s\w+/ matches the substring "quick brown fox" in the text. The find method returns the matched substring.
You can customize the regular expression pattern based on the specific pattern you want to extract from the text.
What is the approach for slicing a string to retrieve a substring in Groovy?
In Groovy, you can use the substring method on a String object to retrieve a substring. The substring method takes either one or two arguments: the starting index of the substring, and optionally the ending index.
Here is the basic syntax for slicing a string in Groovy:
def str = "Hello, World" def substring = str.substring(startIndex, endIndex)
In this example, startIndex is the index where the substring should begin, and endIndex is an optional parameter specifying where the substring should end (not inclusive).
If endIndex is not provided, the substring will extend to the end of the original string.
For example, to retrieve the substring "World" from the string "Hello, World", you can use the following code:
def str = "Hello, World" def substring = str.substring(7)
This will return the substring "World".
Alternatively, you can also use the subscript operator (str[startIndex..endIndex]) to slice a string in Groovy:
def str = "Hello, World" def substring = str[7..11]
This will also return the substring "World".
How to get a substring of a certain length in Groovy?
You can get a substring of a certain length in Groovy using the substring method. Here is an example:
def str = "Hello, World!" def startIndex = 7 def length = 5
def substring = str.substring(startIndex, startIndex + length) println(substring) // Output: World
In this example, the substring method is used to get a substring starting from index 7 (inclusive) and ending at index 12 (exclusive) in the original string "Hello, World!". The resulting substring "World" is then printed to the console.