Posts - Page 209 (page 209)
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3 min readTo sort a list in Groovy, you can use the sort() method on a list object. This method will sort the elements in the list in natural order. You can also use the sort method with a closure to define a custom sorting order. Another option is to use the sort method with a comparator to specify the criteria for sorting the elements in the list. Additionally, you can use the sort method to sort the list in descending order by passing in the reverse: true parameter.
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4 min readIn Groovy, working with dates and times is made easy thanks to built-in support for date and time manipulation. You can create Date objects by calling the new Date() constructor or by parsing a string representation of a date. Groovy also provides convenient methods for formatting dates using SimpleDateFormat.Additionally, Groovy has methods to perform date and time calculations such as adding or subtracting days, months, or years to a given date.
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5 min readIn Groovy, you can format strings by using the String.format() method. This method works similarly to the standard Java String.format() method.You can use format specifiers like %s for strings, %d for integers, %f for floating-point numbers, and so on.For example, you can format a string like this: def name = "John" def age = 30 def formattedString = String.format("My name is %s and I am %d years old.
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5 min readTo make an HTTP request in Groovy, you can use the built-in libraries such as HTTPBuilder or Apache HttpClient.With HTTPBuilder, you can easily create a request object, set headers, parameters, and execute the request to receive the response. Here is an example code snippet using HTTPBuilder: @Grapes([ @Grab(group='org.codehaus.groovy.modules.http-builder', module='http-builder', version='0.7.1') ]) import groovyx.net.http.
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6 min readWorking with JSON in Groovy is quite straightforward due to its built-in support for JSON parsing and serialization. To parse JSON data in Groovy, you can use the JsonSlurper class, which allows you to read JSON data as a map or a list of nested maps and lists. You can use the parseText() method of JsonSlurper to parse a JSON string into a Groovy data structure.
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6 min readRegular expressions in Groovy can be used by creating a java.util.regex.Pattern object and then using it to match against a string. You can use methods like find(), matches(), and split() to perform different operations on a string using the regular expression pattern. Additionally, Groovy provides its own syntax for specifying regular expressions using slashes (/regex/), making it easier to work with regular expressions in Groovy scripts.
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7 min readIn Groovy, exceptions are handled using try-catch blocks. When you anticipate that a certain section of code may throw an exception, you can enclose that code within a try block. If an exception occurs within the try block, the catch block will handle it and execute the specified code.You can also use a finally block to execute code that should run regardless of whether an exception is thrown or not. This block is commonly used for closing resources or cleaning up operations.
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3 min readTo write to a file in Groovy, you can use the File class provided by Groovy. You can create a new File object by specifying the path of the file you want to write to. Then, you can use the withWriter method to open a writer and write your content to the file. Here is an example: def content = "Hello, World!" def file = new File("example.txt") file.withWriter { writer -> writer.write(content) } println "Content has been written to the file.
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3 min readTo read from a file in Groovy, you can use the Java FileReader and BufferedReader classes. First, you need to create a new FileReader object with the path to the file you want to read. Then, wrap the FileReader in a BufferedReader to efficiently read the file line by line. Finally, use a loop to read each line from the file until you reach the end. You can also use the eachLine() method provided by Groovy to simplify the process of reading a file line by line.
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3 min readTo loop through a list in Groovy, you can use a for loop or a for each loop. The for loop allows you to iterate over the list using an index and accessing elements by their position. The for each loop is more convenient as it directly iterates over the elements of the list without the need for an index.You can also use the each() method with a closure to loop through a list. This method takes a closure as an argument and executes the closure for each element in the list.
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4 min readIn Groovy, a function can be defined using the keyword 'def' followed by the function name, parameters (if any), and the body of the function enclosed in curly braces. For example, a simple function that takes two parameters and returns their sum can be defined as follows:def sum(int a, int b) { return a + b }Functions in Groovy can also have optional return types specified after the parameter list, similar to Java.
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4 min readIn Groovy, you can declare a variable simply by assigning a value to it. Groovy is a dynamically typed language, so you don't need to specify the variable type when declaring it. For example, you can declare a variable named 'name' and assign it a string value like this: name = "John"You can also declare variables without assigning a value initially, like this: def ageIn this case, the variable 'age' is declared but not initialized with a value.