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java数组->字符串

       java中所有的类，不管是java库里面的类，或者是你自己创建的类，全部是从object这个类继承的。object里有一个方法就是toString()，那么所有的类创建的时候，都有一个toString的方法。这个方法是干什么的呢？

首先我们得了解，java输出用的函数print();是不接受对象直接输出的，只接受字符串或者数字之类的输出。

/**     * Returns a string representation of the object. In general, the     * {@code toString} 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.     * 
     * The {@code toString} method for class {@code Object}     * returns a string consisting of the name of the class of which the     * object is an instance, the at-sign character `{@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:     * 
   
         * 
    
     * getClass().getName() + '@' + Integer.toHexString(hashCode())     * 
   
     *     * @return  a string representation of the object.     */    public String toString() {        return getClass().getName() + "@" + Integer.toHexString(hashCode());    }

char[] data = {'a', 'b', 'c'};System.out.println(data.toString());  //输出结果为[C@79fc7299

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，数组直接使用toString()，会去调用object类里面的toString方法，结果是[类型@哈希值]。

数组转字符串可以使用Arrays类中的toString方法Arrays.toString(data)。附上Arrays类的toString方法源码。但是由源码可知，这种方法的toString()是带格式的，也就是说输出的是[a, b, c]。

/**     * Returns a string representation of the contents of the specified array.     * The string representation consists of a list of the array's elements,     * enclosed in square brackets ("[]").  Adjacent elements are     * separated by the characters ", " (a comma followed by a     * space).  Elements are converted to strings as by     * String.valueOf(char).  Returns "null" if a     * is null.     *     * @param a the array whose string representation to return     * @return a string representation of a     * @since 1.5     */    public static String toString(char[] a) {        if (a == null)            return "null";        int iMax = a.length - 1;        if (iMax == -1)            return "[]";        StringBuilder b = new StringBuilder();        b.append('[');        for (int i = 0; ; i++) {            b.append(a[i]);            if (i == iMax)                return b.append(']').toString();            b.append(", ");        }    }

　　方法1：直接在构造String时转换。

char[] data = {'a', 'b', 'c'};	String str = new String(data);

　　方法2：调用String类的方法转换。

String.valueOf(data)

/**     * Returns the string representation of the char array     * argument. The contents of the character array are copied; subsequent     * modification of the character array does not affect the newly     * created string.     *     * @param   data   a char array.     * @return  a newly allocated string representing the same sequence of     *          characters contained in the character array argument.     */    public static String valueOf(char data[]) {        return new String(data);    }

java字符串->数组

如果是 “字符串数组” 转 “字符串”，只能通过循环，没有其它方法     String str = "123abc";    char[] arr = str.toCharArray();　　//char数组    for(int i =0;i

参考 http://www.cnblogs.com/ningvsban/p/3955483.html 考 http://www.cnblogs.com/ningvsban/p/3955483.html