从代码点编号的IntStream生成字符串？ [英] Make a string from an IntStream of code point numbers?

问题描述

如果我正在使用Java流，并以 代码点数字，rel = nofollow noreferrer> Unicode 字符，如何呈现 CharSequence 例如 String ？

If I am working with Java streams, and end up with an IntStream of code point numbers for Unicode characters, how can I render a CharSequence such as a String?

String output = "input_goes_here".codePoints(). ??? ;  

我找到了 codePoints（）方法在几个接口上所有都生成 IntStream 代码点的类。但是我还找不到能够接受相同内容的构造函数或工厂方法。

I have found a codePoints() method on several interfaces & classes that all generate an IntStream of code points. Yet I have not been able to find any constructor or factory method that accepts the same.

• CharSequence :: codePoints （）→IntStream


• String :: codePoints（）→IntStream


• StringBuilder :: codePoints（）→IntStream

• CharSequence::codePoints() → IntStream
• String::codePoints() → IntStream
• StringBuilder::codePoints() → IntStream

我正在寻找相反的情况：

I am looking for the converse:

➥如何实例化 String 或 CharSequence 等来自代码点的 IntStream 吗？

➥ How to instantiate a String or CharSequence or such from an IntStream of code points?

推荐答案

使用 IntStream :: collect 和 StringBuilder 。

Use IntStream::collect with a StringBuilder.

String output = 
    "input_goes_here"
    .codePoints()                            // Generates an `IntStream` of Unicode code points, one `Integer` for each character in the string.
    .collect(                                // Collect the results of processing each code point.
        StringBuilder::new,                  // Supplier<R> supplier
        StringBuilder::appendCodePoint,      // ObjIntConsumer<R> accumulator
        StringBuilder::append                // BiConsumer<R,​R> combiner
    )                                        
    .toString()
;

如果您更喜欢 CharSequence 接口在具体的 String ，只需将 toString（）放在最后即可。返回的 StringBuilder 是 CharSequence 。

If you prefer the more general CharSequence interface over concrete String, simply drop the toString() at the end. The returned StringBuilder is a CharSequence.

IntStream codePointStream = "input_goes_here".codePoints ();
CharSequence output = codePointStream.collect ( StringBuilder :: new , StringBuilder :: appendCodePoint , StringBuilder :: append );

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