从没有完全填补字符数组的字符串

问题描述

以下code，很明显，给人一种相当怪异的结果。

 的char []数据=新的char [5];
数据[0] ='A';
数据[1] ='B';
数据[2] ='c'的;通过out.println（'+新的String（数据）+'）;
 

Is there a way to create a string from a character array which takes into account that the whole array might not be filled to the end with characters?

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Reason for question: When using the Reader.read(char[]) method you give it a character array to fill, which I can only assume won't be fully filled, unless you're lucky, when you reach the end of the stream. So was wondering how you could turn this into a string you could append to a StringBuffer. Realize now though that the read method actually returns the number of bytes read though, which I assume can be used in combination with StringBuffer.append(char[], int, int), which renders my question moot. But, still something I am curious about and not something I managed to find by googling, so I guess this question is good to have an answer for here ;)

解决方案

The String has constructorString(char[] value, int offset, int count) that accepts an array of char plus length (and offset):

String s = new String(data, 0, 3);

Assuming no embedded null characters (where a leading null character is considered to be an embedded null) in data the solution would need to locate the first null character to determine the number of char in data:

int length = 0;
while (length < data.length && 0 != data[length]) length++;
String s = new String(data, 0, length);

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