Java 8 Int Stream使用StringBuilder进行收集 [英] Java 8 Int Stream collect with StringBuilder
问题描述
我有一个函数可以创建一个int流,查找不同的字符,对它们进行排序,然后将它们收集到一个新列表中,然后创建一个字符串。下面是函数。
I have a function that creates an int stream, finds the distinct characters, sorts them and then collects them into a new list and then creates a string. Below is the function.
public static String longest(String s1, String s2) {
String s = s1 + s2;
return s.chars()
.distinct()
.sorted()
.collect(StringBuilder::new, StringBuilder::appendCodePoint, StringBuilder::append)
.toString();
}
我真的很难弄清楚StringBuilder的收集是如何工作的,我在网上搜索过Java文档,但对它没有任何意义。从我可以看出,它创建了一个StringBuilder的新实例,只是在流中附加每个字符,任何人都可以给出更好的解释吗?谢谢
I am really struggling to work out how the collect with the StringBuilder is working, I have searched online and the Java docs but can't make any sense of it. From what I can make out, it creates a new instance of StringBuilder and just appends each character in the stream, can anyone give a better explanation? Thank you
推荐答案
参数1:创建起始结果(在这种情况下,你的新 StringBuilder
)。
Argument 1: Creates your starting result (in this case, your new StringBuilder
).
参数2:在结果中添加一个元素( String
)( StringBuilder
)。
Argument 2: Adds an element (String
) to your result (StringBuilder
).
参数3:如果并行运行流,则多个 StringBuilders
将被创建。这是为了将这些组合在一起。
Argument 3: If you run the stream in parallel, multiple StringBuilders
will be created. This is for combining these together.
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