Java数组转字符串
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); |
方法2:调用String类的方法转换。
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String.valueOf(char[] ch) |
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