Java数组转字符串
Java自带toString()方法，确实方便了不少，但是要正确使用。数组直接使用toString()的结果是[类型@哈希值]。这是因为Object类中的toString()如下：
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/** * Returns a string representation of the object. In general, the
* <code>toString</code> method returns a string that
* "textually represents" this object. The result should
* be a concise but informative representation that is easy for a
* person to read.
* It is recommended that all subclasses override this method.
* <p>
* The <code>toString</code> method for class <code>Object</code>
* returns a string consisting of the name of the class of which the
* object is an instance, the at-sign character `<code>@</code>\', and
* the unsigned hexadecimal representation of the hash code of the
* object. In other words, this method returns a string equal to the
* value of:
* <blockquote>
* <pre>
* getClass().getName() + \'@\' + Integer.toHexString(hashCode())
* </pre></blockquote>
*
* @return a string representation of the object.
*/
public String toString() {
return getClass().getName() + "@" + Integer.toHexString(hashCode());
} |
而数组类中并没有对此方法重写(override)，仅仅是重载(overload)为类的静态方法（参见java.util.Arrays）。
所以数组转为字符串应写成：
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Arrays.toString(a) |
这种方法的toString()是带格式的，也就是说输出的是[a, b, c]，而且还带有空格，如果仅仅想输出abc则需用以下两种方法：
方法1：直接在构造String时转换。
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char[] data = {\'a\', \'b\', \'c\'};
String str = new String(data);
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方法2：调用String类的方法转换。
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String.valueOf(char[] ch)
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