Перевод строки в символьный массив Java

1. toCharArray()

 /**
 * Converts this string to a new character array.
 *
 * @return  a newly allocated character array whose length is the length
 *          of this string and whose contents are initialized to contain
 *          the character sequence represented by this string.
 */
public char[] toCharArray() {
    // Cannot use Arrays.copyOf because of class initialization order issues
    char result[] = new char[value.length];
    System.arraycopy(value, 0, result, 0, value.length);
    return result;
}

Пример: "String".toCharArray() - строка в символьный массив.

2. valueOf(char data[])

 /**
 * Returns the string representation of the {@code char} array
 * argument. The contents of the character array are copied; subsequent
 * modification of the character array does not affect the returned
 * string.
 *
 * @param   data     the character array.
 * @return  a {@code String} that contains the characters of the
 *          character array.
 */
public static String valueOf(char data[]) {
    return new String(data);
}

Пример: String.valueOf(charArr) - символьный массив в строку.