JEP 378: Text Blocks涵盖了此功能，并且包含在JDK 15中。它最初出现在JDK 13中的JEP 355: Text Blocks(预览)和JDK 14中的JEP 368: Text Blocks(第二预览)，可以在这些版本中通过——enable-preview javac选项启用。

语法允许这样写:

String s = """
           text
           text
           text
           """;

在此之前，在JDK 12中，JEP 326: Raw String Literals旨在实现类似的功能，但最终被撤回:

请注意:这原本是JDK 12中的预览语言功能，但它已被撤回，并没有出现在JDK 12中。它在JDK 13中被文本块(JEP 355)所取代。

这个问题有两个答案:

In you want to stick to pure Java, with Java 14 being released in March 2020, you can leverage the JEP 368 - Text Blocks, in Second Preview mode. Actually the feature is in preview mode in other releases (at least 13 has it). I created and example set here. While this feature is useful, it can be easily abused. Remember that Java requires compilation - having large character arrays in your code can be an easy way to shoot yourself in the leg (if you want a quick change, you will need recompilation - that toolset might not be available to the guy operating your application).

根据我的经验，建议在配置文件中保留大字符串(通常是应用程序操作员可以/应该在运行时更改的字符串)。

总结:负责地使用文本块:)。

由于Java(还)不支持多行字符串，目前唯一的方法是使用前面提到的技术之一来破解它。我使用上面提到的一些技巧构建了下面的Python脚本:

import sys
import string
import os

print 'new String('
for line in sys.stdin:
    one = string.replace(line, '"', '\\"').rstrip(os.linesep)
    print '  + "' + one + ' "'
print ')'

把它放在一个名为javastringify.py的文件中，把你的字符串放在一个名为mystring.txt的文件中，然后像下面这样运行:

cat mystring.txt | python javastringify.py

然后，您可以复制输出并将其粘贴到编辑器中。

修改这需要处理任何特殊情况，但这是为我的需要。希望这能有所帮助!

看到所有的答案，我认为没有人提到比在java的新版本，你可以这样做:

String s = """
    This
    is 
    a
    multiline
    string
    """;
System.out.println(s);

这是它打印的内容:

This
is
a
multiline
string

注意:这个答案适用于Java 14及以上版本。

Java 15引入了文本块(多行文字)。详情请看这个答案。

听起来像是要做一个多行文字，这在Java中是不存在的。

你最好的选择是用+ d组合的字符串。人们提到的一些其他选项(StringBuilder, String。format, String.join)只有当你从一个字符串数组开始时才更可取。

考虑一下:

String s = "It was the best of times, it was the worst of times,\n"
         + "it was the age of wisdom, it was the age of foolishness,\n"
         + "it was the epoch of belief, it was the epoch of incredulity,\n"
         + "it was the season of Light, it was the season of Darkness,\n"
         + "it was the spring of hope, it was the winter of despair,\n"
         + "we had everything before us, we had nothing before us";

与StringBuilder:

String s = new StringBuilder()
           .append("It was the best of times, it was the worst of times,\n")
           .append("it was the age of wisdom, it was the age of foolishness,\n")
           .append("it was the epoch of belief, it was the epoch of incredulity,\n")
           .append("it was the season of Light, it was the season of Darkness,\n")
           .append("it was the spring of hope, it was the winter of despair,\n")
           .append("we had everything before us, we had nothing before us")
           .toString();

与String.format ():

String s = String.format("%s\n%s\n%s\n%s\n%s\n%s"
         , "It was the best of times, it was the worst of times,"
         , "it was the age of wisdom, it was the age of foolishness,"
         , "it was the epoch of belief, it was the epoch of incredulity,"
         , "it was the season of Light, it was the season of Darkness,"
         , "it was the spring of hope, it was the winter of despair,"
         , "we had everything before us, we had nothing before us"
);

相对于Java8 String.join():

String s = String.join("\n"
         , "It was the best of times, it was the worst of times,"
         , "it was the age of wisdom, it was the age of foolishness,"
         , "it was the epoch of belief, it was the epoch of incredulity,"
         , "it was the season of Light, it was the season of Darkness,"
         , "it was the spring of hope, it was the winter of despair,"
         , "we had everything before us, we had nothing before us"
);

如果您想在特定的系统中使用换行符，您要么需要使用system . lineseparator()，要么可以在String.format中使用%n。

另一种选择是将资源放在文本文件中，只读取该文件的内容。对于非常大的字符串，这将是可取的，以避免不必要地膨胀您的类文件。

在Eclipse中，如果你打开选项“在粘贴到字符串文字时转义文本”(在Preferences > Java > Editor > Typing中)并在引号中粘贴一个多行字符串，它将自动为你的所有行添加“和\n”+。

String str = "paste your text here";