Groovy & Gradle: JVM Automation and Build Engineering · 课时

Groovy 字符串与 GString

掌握 Groovy 字符串处理：单引号、双引号和三引号、GString 插值，以及用于脚本任务的多行文本。

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Groovy 字符串与 GString 是 CoddyKit 上的免费 Groovy & Gradle: JVM Automation and Build Engineering 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Groovy & Gradle: JVM Automation and Build Engineering 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Groovy & Gradle: JVM Automation and Build Engineering 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Strings in Groovy

Groovy gives you several string literals, each for a job. Picking the right one keeps scripts clean and dodges escaping headaches.

Single-Quoted Strings

Single quotes make a plain String with no interpolation — what you type is exactly what you get.

def s = 'Hello World'
println s

Double-Quoted GStrings

Double quotes make a GString: any expression inside ${...} is evaluated and dropped into the text.

def name = "Alice"
println "Hello, ${name}!"

Simplified Interpolation

For a single variable you can skip the braces and just put a dollar sign before the name.

def user = "Bob"
println "Welcome $user"

Expressions Inside GStrings

Any expression fits inside ${...} — method calls, arithmetic, whatever you need.

def a = 3, b = 4
println "Sum is ${a + b}"

Triple-Quoted Strings

Triple single quotes give a multiline plain string — ideal for text blocks without escaping every newline.

def text = '''Line one
Line two
Line three'''
println text

Triple Double Quotes

Triple double quotes are multiline and support interpolation — perfect for templated output.

def title = "Report"
def doc = """=== ${title} ===
Generated by Groovy"""
println doc

Slashy Strings

Slashy strings (between forward slashes) skip backslash escaping — great for regexes and file paths.

def pattern = /\d{4}-\d{2}/
println pattern

Lazy GString Evaluation

A GString can embed a closure (${-> ...}) that re-evaluates on each render, capturing live values instead of a snapshot.

def count = 1
def g = "Count: ${-> count}"
count = 2
println g

Useful String Methods

Groovy adds handy string methods like padLeft and reverse, plus easy slicing with index ranges.

def s = "Groovy"
println s.reverse()
println s[0..2]

GString vs String Equality

A GString isn't a String, but they compare equal and auto-convert. Call toString() when the exact type matters, like map keys.

def k = "id_${1}".toString()
def m = [(k): "value"]
println m["id_1"]

Quick Check

Test your Groovy string knowledge.

在交互式课程中回答

Recap

You mastered Groovy strings: plain vs GString, triple-quoted multiline, slashy strings for regex, and lazy ${-> ...} closures.

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常见问题解答

「Groovy 字符串与 GString」课时是免费的吗？

是的 — 「Groovy 字符串与 GString」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Groovy & Gradle: JVM Automation and Build Engineering 课程的其余内容，请升级到 CoddyKit PRO。 Groovy & Gradle: JVM Automation and Build Engineering 课程共包含 4 节课。

「Groovy 字符串与 GString」这节课中我会学到什么？

掌握 Groovy 字符串处理：单引号、双引号和三引号、GString 插值，以及用于脚本任务的多行文本。你通过在浏览器中直接运行的动手代码来练习 Groovy & Gradle: JVM Automation and Build Engineering，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Groovy & Gradle: JVM Automation and Build Engineering 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Groovy & Gradle: JVM Automation and Build Engineering 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「Groovy 字符串与 GString」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

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