Concatenate multi-line strings more easily using the new Text Blocks feature in Java 13

Use the new Text Blocks feature in Java 13 to more easily splice multi-line strings

In programming, splicing multi-line strings is a common task. In earlier Java versions, we usually used the string concatenation operator ( ) or StringBuilder to concatenate multi-line strings. However, these methods can result in less readable code, especially when the string contains a lot of newlines and indentation. To solve this problem, Java 13 introduces a new feature, Text Blocks, which makes concatenating multi-line strings more concise and readable.

Text Blocks allows us to use """" three double quotes to define a multi-line string, and use newlines and indentation to format the string. The following is a simple example that shows how to use Text Blocks to concatenate multi-line strings:

String message = """
    Hello,
    Java 13!
    """;
System.out.println(message);

In this example, we use """ three double quotes to enclose the string, and then in multiple lines Line strings are formatted using newline characters and indentation. In this way, we can visually see the structure of the string without having to manually add newline characters and indentation.

In addition to newline characters and indentation In addition, Text Blocks also supports including escape sequences in strings without triggering compilation errors. In this way, we can write escape sequences directly into strings without having to use Java's backslash escape mechanism.

String message = """
    Hello,
    Java 13!
    
    This is a         Tab character
    This is a "Double Quotes"
    This is a 'Single Quotes'
    This is a \Backslash
    This is a 
New Line
    """;
System.out.println(message);

Since Text Blocks are processed at compile time, there is no impact on performance at runtime. This makes Text Blocks ideal for splicing large amounts of multi-line strings.

In addition to the above Sample code, Text Blocks also provides some other features, such as:

1. Remove leading and trailing newlines: We can omit newlines in Text Blocks, making the resulting string more compact.
2. Nesting of text blocks: We can nest another Text Block within a Text Block and distinguish them by indentation.

However, it should be noted that Text Blocks are still an experimental feature in Java and may change in future versions. In versions prior to Java 13, we can still use the string concatenation operator or StringBuilder to concatenate multi-line strings.

To summarize, the Text Blocks feature in Java 13 makes concatenating multi-line strings more convenient and readable. It allows us to format strings intuitively by using three double quotes, newlines, and indentation. And , Text Blocks do not have a negative impact on runtime performance, making it the preferred method for concatenating multi-line strings.

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