* Class description: String tool Class Name: String_U, tool class string_u

* Class description: String tool Class Name: String_U, tool class string_u

/*************************************** * *** Class description: string tool Class Name: string_U *************************************** * ***/public class String_U {private String_U () {}/*** check whether the mobile phone number is valid ** @ param phoneNum * @ return boolean true indicates that the mobile phone number is valid, and false indicates that the mobile phone number is invalid */public static boolean isMobileNum (String phoneNum) {if (TextUtils. isEmpty (phoneNum) return false; Pattern p = Pattern. compile ("(\ + 86 | 86 )? (13 [0-9] \ d {8}) | (15 [0-9] \ d {8}) | (170 \ d {8 }) | (18 [0-9] \ d {8}) "); Matcher m = p. matcher (phoneNum); if (m. matches () {return true;} else {return false;} public static boolean isEmail (String email) {boolean tag = true; // final String pattern1 = // "^ [0-9a-z] [a-z0-9 \\. _-] {1,} @ [a-z0-9-] {1,} [a-z0-9] \. [a-z \.] {1,} [a-z] $ "; final String pattern1 =" ^ [\ w] [a-z0-9 \\. _-] {1,} @ [a-z0-9-] {1,} [a-z0-9] \. [a-z \.] {1 ,}[ A-z] $ "; final Pattern pattern = Pattern. compile (pattern1); final Matcher mat = pattern. matcher (email); if (! Mat. find () {tag = false;} return tag ;} /*** set the font color of the specified position ** @ param color * hexadecimal color value * @ param text * @ param start * set the start position of the color * @ param end * set the end position of the color * @ return mSpannableString */public static SpannableString getSpecialSpannableString (String color, string text, int start, int end) {SpannableString mSpannableString = new SpannableString (text); // set the foreground color of mSpannableString. setSpan (new ForegroundColorSp An (Color. parseColor (color), start, end, Spanned. SPAN_EXCLUSIVE_EXCLUSIVE); return mSpannableString;}/*** verify that the password complies with the rules ** @ param password * @ return boolean true indicates that the password is valid, false indicates that the password is invalid */public static boolean checkPassword (String password) {if (password = null | password. length ()> 16 | password. length () <6) {return false;} Pattern pattern = Pattern. compile ("^ [a-zA-Z0-9] {6, 16} $"); Matcher invalid = patte Rn. matcher (password); return invalid. matches ();}/*** String Security comparison ** @ param lStr * String on the left * @ param rStr * String on the right * @ return boolean true the two strings share the same content, false two strings are inconsistent */public static boolean equal (String lStr, String rStr) {if (lStr = null) {return lStr = rStr;} return lStr. equals (rStr);}/*** calculate the percentage ** @ param y * @ param z * @ return */public static String myPercent (int y, int z) {String percent = null ;/ /The value of percentage accepted is float en y = y; float baiz = z; float fen = y/baiz; // NumberFormat nf = NumberFormat. getPercentInstance (); the comment is also a method // nf. setMinimumFractionDigits (2); number of decimal places after which DecimalFormat df1 = new DecimalFormat ("##% ");//##. 00% // percentage format. for less than two digits, use 0 to complete the format. // baifenbi = nf. format (fen); percent = df1.format (fen); return percent;}/*** splits the specified text, and append the solid circle or serial number ** @ param text * before the specified text to specify the text * @ param separator * @ Param circle * entry symbol (for example, "•") * @ param isAppendNum * whether to add the serial number * @ return */public static String separatorString (String text, String separator, String circle, boolean isAppendNum) {if (TextUtils. isEmpty (text) {return "";} StringBuffer strBuffer = new StringBuffer (); if (TextUtils. isEmpty (separator) {// No separator strBuffer. append (circle); strBuffer. append (text);} else {String [] strArray = text. split (separator ); For (int I = 0; I <strArray. length; I ++) {if (! TextUtils. isEmpty (circle) {// Add the entry symbol strBuffer. append (circle);} if (isAppendNum) {// Add the serial number strBuffer. append (I-1) + ",");} strBuffer. append (strArray [I]); if (I! = StrArray. length-1) {// Add line feed strBuffer. append ("\ n") ;}} return strBuffer. toString ();}}

Defines a string class, which includes two data members: (added below)

# Include <iostream>
# Include <memory. h>

Using namespace std;

Class c_string {
Typedef unsigned size_t;
Friend c_string & contact (c_string & str1, const c_string & str2 );
Public:
C_string (size_t length = 20): m_nLength (length ){
M_pStr = new char [m_nLength + 1];
Memset (m_pStr, 0, m_nLength + 1 );
}

C_string (const char * pStr ){
M_nLength = strlen (pStr );
M_pStr = new char [m_nLength + 1];
Memcpy (m_pStr, pStr, m_nLength + 1 );
}

C_string (const c_string & cstr ){
M_nLength = cstr. length ();
M_pStr = new char [m_nLength + 1];
Memcpy (m_pStr, cstr. c_str (), m_nLength + 1 );
}

C_string & operator = (const c_string & cstr ){
If (this = & cstr ){
Return * this;
}
Delete m_pStr;
M_nLength = cstr. length ();
M_pStr = new char [m_nLength + 1];
Memcpy (m_pStr, cstr. c_str (), m_nLength + 1 );
Return * this;
}

Void print () const {
Cout <m_pStr <endl;
}

~ C_string (){
If (m_pStr! = NULL ){
Delete m_pStr;
}
}

Size_t length () const {
Return m_nLength;
}

Const char * c_str () const {
Return m_pStr;
}
Private:
Char * m_pStr;
Size_t m_nLength;
};

C_string & contact (c_string & str1, const c_string & str2 ){
If (str2.length () = 0 ){
Return str1;
}
Char * tem = new char [str1.m _ nLength + st ...... remaining full text>

2) simulate the string class in the C ++ library and declare a string of the C ++ string class. The basic framework of this class is as follows:

# Include <iostream>
# Include <string>
Using namespace std;

Class Mystring
{
Public:
// Interface functions here
Mystring (); // No parameter constructor,
Mystring (char * c); // use the C string as the initial value of s
Mystring (int num, char c); // generate a string containing num c characters
Mystring (Mystring & s); // copy the constructor
~ Mystring (); // destructor

Void assign (char * c); // assign a new value
Int compare (Mystring & s); // compare string, less than-1 returned, equal to 0, greater than 1
Int length (); // number of returned characters
Char at (int index); // returns a single character
String assign (Mystring & s); // assign a new value
Void clear (); // Delete All characters
Void show (); // print the string content

Private:
Char * m_data; // record the string's first address
Int m_length; // specifies the string length.

};

Mystring: Mystring () // No parameter Constructor
{
M_data = new char [10];
Strcpy (m_data, "Hello ");
M_length = strlen ("Hello ");
}

Mystring: Mystring (char * c) // use the C string as the initial value of s.
{
M_data = new char [strlen (c) + 1];
Strcpy (m_data, c );
M_length = strlen (m_data );
}

Mystring: Mystring (int num, char c) // generate a string containing num c characters
{
M_data = new char [num + 1];
For (int I = 0; I <num; I ++)
{
M_data [I] = c;
}
M_data [I] = '\ 0 ';
M_length = strlen (m_data );
}

Mystring: Mystring (Mystring & s) // copy the constructor
{
M_data = new char [strlen (s. m_data) + 1];
Strcpy (m_data, s. m_data );
M_length = strlen (s. m_data );
}

Mystring ::~ Mystring () ...... the remaining full text>