非法文本块打开定界符序列，缺少行终止符 [英] illegal text block open delimiter sequence, missing line terminator

问题描述

Java 13即将到来，所以我开始研究它的新功能，其中之一是文本块.

Java 13 is coming, so I started studying its new features, one of which is text blocks.

我写了一个简单的程序

public final class Example {
    public static void main(String[] args) {
        final String greeting = """Hello
        It's me, Andrew!""";
        System.out.println(greeting);
    }
}

我希望看到

Hello
It's me, Andrew!

我得到的是编译错误提示

What I got is a compilation error saying

非法文本块打开定界符序列，缺少行终止符

illegal text block open delimiter sequence, missing line terminator

推荐答案

文本块的上下文必须从新行开始.

The context of your text block must start from a new line.

public final class Example {
    public static void main(String[] args) {
        final String greeting = """
            Hello
            It's me, Andrew!""";
        System.out.println(greeting);
    }
}

打印

Hello
It's me, Andrew!

摘录自 JEP 355:文本块(预览):

一个文本块由零个或多个内容字符组成，并用打开和关闭定界符将其括起来.

A text block consists of zero or more content characters, enclosed by opening and closing delimiters.

分隔符是由三个双引号字符(""")组成的序列，后跟零个或多个空格，后跟一个行终止符.内容从开头定界符的行终止符之后的第一个字符开始.

The opening delimiter is a sequence of three double quote characters (""") followed by zero or more white spaces followed by a line terminator. The content begins at the first character after the line terminator of the opening delimiter.

不过，您不必在内容的末尾放置一个行终止符.

You don't necessarily have to put a line terminator at the end of your content, though.

结束分隔符是三个双引号字符的序列. 内容在结束定界符的第一个双引号之前的最后一个字符处结束.

final String greeting = """
    Hello
    It's me, Andrew!
    """;

会意味着

Hello
It's me, Andrew!
<an empty line here>

我发现还不清楚，所以我不得不与社区分享.

I find it extremely unclear, so I had to share this with the community.

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