Javase-----Common Class (1)

2.2 Common class----string processing

1  Public classBijiao {2 3      Public Static voidMain (string[] args) {4String s= "Lina520lina520lina";5         //System.out.println (S.length ());6System.out.println ("ZCW". CompareTo (s));//the difference of the first unequal character7         // -8System.out.println ("Sfsdfsdfsdfdfsdfsdfsdf". CompareTo (s));//a positive number means it's not his substring.9         //7TenSystem.out.println ("Lina". CompareTo (s)); One         //-14 ASystem.out.println ("Lina520lina520lina". CompareTo (s)); -         //0 -System.out.println ("520". CompareTo (s)); the         //-55 -         //indicates that the value returned by CompareTo is a positive number, indicating that the string used to invoke the method > parameter passed the string -         //The return value is a negative number that describes the string passed by the string < parameter of the calling method -         //The return value is 0, and the two string sizes are considered equal +          -         //System.out.println (S.comparetoignorecase ("Lina")); +}

1 Importjava.util.Arrays;2 3  Public classFeige {4 5      Public Static voidMain (string[] args) {6String s= "Lina520lina520lina";7String str= "520";8String [] ss=s.split (str);9String [] Ss1=s.split ("520");//the split is an array of strings .TenString [] Ss2=s.split ("\\d", 4);//limit cut to 4 segments One         //regex: Regular Expression ASystem.out.println (arrays.tostring (ss));//traversal of an array -         //[Lina, Lina, Lina] - System.out.println (arrays.tostring (SS2)); the         //[Lina,,, Lina520lina] -      -  -          +}

1  Public classHuoqu {2 3      Public Static voidMain (string[] args) {4String s= "Lina520lina520lina";5System.out.println (S.charat (7));//L6System.out.println (S.codepointat (7));//1087System.out.println (S.codepointat (6));// -8System.out.println (S.codepointbefore (7));// -9System.out.println (S.codepointcount (6, 8));//2TenSystem.out.println (S.indexof ("Lina"));//0 OneSystem.out.println (S.indexof (-5));//All is-1 ASystem.out.println (S.indexof ("Lina", 2));//7 -System.out.println (S.lastindexof ("Lina"));// - -System.out.println (S.lastindexof ("Lina", 14));// - theSystem.out.println (S.lastindexof ("Lina", 13));//7 -System.out.println (S.length ());// - -}

1  Public classjiequ {2 3      Public Static voidMain (string[] args) {4String s= "Lina520lina520lina";5System.out.println (S.substring (4));//Intercept from fourth, keep fourth to end, including 4th6         //520lina520lina7System.out.println (S.substring (4, 11));//Intercept from fourth to 11th, excluding 11th8          //520lina9}

1  Public classOther {2 3 4 5      Public Static voidMain (string[] args) {6String s= "ZCWLINA520LINA520LINAZCW";7 System.out.println (S.trim ());8         //ZCWLINA520LINA520LINAZCW9         TenString str= string.valueof (true);//turns a Boolean into a string OneSystem.out.println (str);//true A          -String str1=string.valueof (New Char[]{' z ', ' C ', ' W '}); -System.out.println (STR1);//ZCW a character array into a string the          -          -String str2 =string.valueof (New Char[]{' l ', ' I ', ' n ', ' a '}, 0, 2); -String str21=string.copyvalueof (New Char[]{' l ', ' I ', ' n ', ' a '}, 0, 2); +         //String str21=string.copyvalueof (New string[]{"Lina", "520", "ZCW", "520"}, 0, 2);//not -         //String str22=string.copyvalueof (New int[]{1,2,3}, 0, 2); +System.out.println (STR2);//Li 第2-1个 A string from the No. 0 position of the string to the position of the ASystem.out.println (STR21);//Li at          -System.out.println (String.Format ("a =%d,b =%f,c =%.2f,d=%s", 10,3.1415,3.1415,3.1415)); -          -          -          -          inString str3=string.valueof (3.14);//converts a floating-point or shaped data into a string -System.out.println (STR3);//3.14 to          +          -          the          *         //so is it possible to get the character string of these into the data type to do it? $String string = "123.456";//to ensure that the string is a numeric value, an exception is thrownPanax Notoginseng         DoubleD =double.parsedouble (string); -         floatf =float.parsefloat (string); the         //int I2=int.parseint (string);///No such wording +System.out.println (d);//123.456 ASystem.out.println (f);//123.456 the          +String S14 = "314"; -         inti = Integer.parseint (S14);//It's not a cosmetic error . $System.out.println (i);//314 $          -          -          the          -         Wuyi          the          -     } Wu  -}

Javase-----Common Class (1)