private final char value[];   private int hash; // Default to 0    public String(String original) {        this.value =http://www.mamicode.com/ original.value;        this.hash = original.hash;    }     public String(char value[]) {        this.value =http://www.mamicode.com/ Arrays.copyOf(value, value.length);    }String： |--CompareTo public int compareTo(String anotherString) {        int len1 = value.length;        int len2 = anotherString.value.length;        int lim = Math.min(len1, len2);         //取较小长度的字符串作为比较长度        char v1[] = value;        char v2[] = anotherString.value;        int k = 0;        while (k < lim) {            char c1 = v1[k];            char c2 = v2[k];            if (c1 != c2) {                    //逐个比较                return c1 - c2;            }            k++;        }        return len1 - len2;    }        |--equals public boolean equals(Object anObject) {        if (this == anObject) {           //地址相同直接判断相等            return true;        }        if (anObject instanceof String) {  //先判别类是否相同            String anotherString = (String)anObject;            int n = value.length;            if (n == anotherString.value.length) {  //字符串长度是否一致                char v1[] = value;                char v2[] = anotherString.value;                int i = 0;                while (n-- != 0) {                    if (v1[i] != v2[i])           //逐个进行比较                        return false;                    i++;                }                return true;            }        }        return false;    }      |--hashCode public int hashCode() {        int h = hash;        if (h == 0 && value.length > 0) {            char val[] = value;            for (int i = 0; i < value.length; i++) {                h = 31 * h + val[i];            }            hash = h;        }        return h;    }         //toString的经典实现     public static String toString(int[] 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++) {//中间省略判断，提高效率                b.append(a[i]);                if (i == iMax)                    return b.append(‘]‘).toString();                b.append(", ");            }        }