Use the new Text Blocks feature in Java 13 to achieve more complex multi-line string concatenation-javaTutorial-php.cn

Use the new Text Blocks feature in Java 13 to achieve more complex multi-line string concatenation

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Release： 2023-07-30 21:25:18

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Use the new Text Blocks feature in Java 13 to achieve more complex multi-line string concatenation

Java 13 is the latest version of the Java programming language, introducing many new features and improvements. One of the important features is Text Blocks, which provides a more convenient and flexible method for string processing. Text Blocks allow us to write concatenations of multi-line strings in a more natural way in our code without having to manually deal with line breaks and indentation.

Before Java 13, if we needed to concatenate a multi-line string, we usually used the string concatenation character ( ) and the newline character (
) to build the string manually. This approach is tedious and error-prone. For example, let's say we want to splice a block of HTML code:

String html = "
"

        + "  <body>

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        + "    <h1>Hello, World!</h1>

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        + "  </body>

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        + "</html>";

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As you can see, using string concatenation and newline characters to splice multi-line strings is very verbose and error-prone. Using the Text Blocks feature of Java 13, we can use it in a more intuitive and concise way. Write the same code in the same way.

The following is a sample code for the above HTML code block implemented using the Text Blocks feature:

String html = """

          <html>
            <body>
              <h1>Hello, World!</h1>
            </body>
          </html>
          """;

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You can see Now, using the Text Blocks feature, we can use three double quotes (""") to surround multi-line strings without manually adding newlines. At the same time, Text Blocks automatically preserves the indentation in the string and automatically Remove the indentation of the first line. In this way, we can write multi-line strings in a more intuitive and readable way without worrying about line breaks and indentation.

In addition to automatic line wrapping and retaining indentation In addition, Text Blocks also supports additional features, such as inserting variables and escaping characters. We can use the ${} syntax to insert variables in Text Blocks, and the value of the variable will be replaced at runtime. For example:

String name = "Alice";
String message = """

             Hello, ${name}!
             Welcome to Java 13!
             """;

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In the above example, ${name} will be replaced by the value of the variable name at runtime. This way we can easily insert dynamic content into Text Blocks.

In addition, Text Blocks also supports escape characters. For example, we can use characters such as double quotes (") and backslash () in Text Blocks without additional escaping processing.

In summary, the Text Blocks feature of Java 13 provides a more convenient and intuitive way to concatenate multi-line strings. It can help developers write multi-line strings in a more natural way and avoid manual processing The tedious work of line breaks and indentation. In addition, Text Blocks also supports functions such as inserting variables and escaping characters, further increasing its flexibility and practicality.

The Text Blocks feature of Java 13 greatly simplifies many The concatenation of line strings improves the readability and ease of use of the code. If you have been struggling with the tedious multi-line string concatenation operation, then upgrading to Java 13 and making full use of the Text Blocks feature will be a good choice .Let us enjoy the fun of Java programming together!

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