将“IntStream"打印为“String"的最简单方法

2022-01-22 00:00:00 java-8 java java-stream

使用 Java-8，我可以使用 chars<轻松地将 String(或任何 CharSequence)视为 IntStream/code> 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 == ' ' ? ' ': '*');

我一直在寻找一种整洁的方法来打印结果，但我什至找不到简单的方法.如何将这个 int 流放回可以打印的表单，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 ints back into a form that can be printed like I can a String.
从上面的stars希望能打印出来

From the above stars I hope to print
***** ******


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.并非所有东西都能从 lambdas 中受益.

But still, "Hello world.".replaceAll("[^ ]", "*") is simpler. Not everything benefits from lambdas.


	
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