将 `IntStream` 打印为 `String` 的最简单方法 [英] Simplest way to print an `IntStream` as a `String`
问题描述
使用 Java-8,我可以轻松地将 String
(或任何 CharSequence
)视为使用 chars
或 codePoints
方法.
With Java-8 I can easily treat a String
(or any CharSequence
) as an IntStream
using either the chars
or the codePoints
method.
IntStream chars = "Hello world.".codePoints();
然后我可以操作流的内容
I can then manipulate the contents of the stream
IntStream stars = chars.map(c -> c == ' ' ? ' ': '*');
我一直在寻找一种打印结果的整洁方法,但我什至找不到一种简单的方法.我如何将这个 int
流放回可以打印的表单中,就像我可以打印 String
一样.
I have been hunting for a tidy way to print the results and I cant even find a simple way. How do I put this stream of int
s back into a form that can be printed like I can a String
.
从上面的stars
我希望打印
***** ******
推荐答案
String result = "Hello world."
.codePoints()
//.parallel() // uncomment this line for large strings
.map(c -> c == ' ' ? ' ': '*')
.collect(StringBuilder::new,
StringBuilder::appendCodePoint, StringBuilder::append)
.toString();
但是,"Hello world.".replaceAll("[^ ]", "*")
更简单.并非一切都从 lambda 中受益.
But still, "Hello world.".replaceAll("[^ ]", "*")
is simpler. Not everything benefits from lambdas.
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