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strings - Expand concept by newline and text blocks #2941

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e713aae
strings - Expand concept by newline and text blocks
fapdash Apr 27, 2025
3bf34e6
Rewording
fapdash Apr 27, 2025
0edaa9f
Fix markdown linting errors
fapdash Apr 27, 2025
566f303
Clarify when to use system dependent line separators
fapdash Apr 27, 2025
01c5a65
Fix typo in concepts/strings/about.md
fapdash Feb 11, 2026
1ef8e46
Update concepts/strings/about.md
fapdash Feb 11, 2026
7b5c139
Move System.lineSeperator after string concatination and add example
fapdash Feb 11, 2026
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4 changes: 3 additions & 1 deletion concepts/strings/.meta/config.json
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Expand Up @@ -3,5 +3,7 @@
"authors": [
"mirkoperillo"
],
"contributors": []
"contributors": [
"fapdash"
]
}
44 changes: 42 additions & 2 deletions concepts/strings/about.md
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Expand Up @@ -22,6 +22,26 @@ String escaped = "c:\\test.txt";
// => c:\test.txt
```

To put a newline character in a string, use the `\n` escape code (`\r\n` on Windows):

```java
String multilineHtml = "<html>\n <body>\n <h1>Hello, World!</h1>\n </body>\n</html>\n";
```

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@kahgoh kahgoh Mar 2, 2026

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Something still seems weird about the flow because we revisit line separators later. Perhaps we could add a sentence like Alternatively, we can use String.format or ``System.lineSeparator()` to add system independent line separator (discussed later).

To comfortably work with texts that contain a lot of newlines you can use [Text Blocks][text-blocks].
These multi-line strings are delimited by triple double quote (`"`) characters.

```java
String multilineHtml = """
<html>
<body>
<h1>Hello, World!</h1>
</body>
</html>
""";
// => "<html>\n <body>\n <h1>Hello, World!</h1>\n </body>\n</html>\n"
```

Finally, there are many ways to concatenate a string.
The simplest one is the `+` operator:

Expand All @@ -35,15 +55,35 @@ For any string formatting more complex than simple concatenation, `String.format

```java
String name = "Jane";
String.format("Hello %s!",name);
String.format("Hello %s!", name);
// => "Hello Jane!"
```

Other possibilities are:
The conversion `%n` in a format string inserts a system-dependent line separator.

```java
String name = "Jane";
String.format("Hello,%n%s!", name);
// => "Hello,\nJane!" (Linux, macOS)
// => "Hello,\r\nJane!" (Windows)
```

Alternatively you can call the function [`System.lineSeparator()`][system-line-separator], which returns the system-dependent line separator as a string.

```java
String name = "Jane";
"Hello," + System.lineSeparator() + name;
// => "Hello,\nJane!" (Linux, macOS)
// => "Hello,\r\nJane!" (Windows)
```

Other possibilities to build more complex strings are:

- use [`StringBuilder` class][string-builder]
- use [`String.concat` method][string-concat]

[string-class]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html
[text-blocks]: https://openjdk.org/projects/amber/guides/text-blocks-guide
[string-builder]: https://docs.oracle.com/javase/tutorial/java/data/buffers.html
[string-concat]: https://docs.oracle.com/javase/8/docs/api/java/lang/String.html#concat-java.lang.String-
[system-line-separator]: https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/System.html#lineSeparator()