Java Fundamentals Hardening the conversion function of the string class of the 35:string class

1. Conversion function of the String class

byte []  getBytes ()char[]   ToCharArray ()static String  valueOf (  Char[]  CHS)static string  valueOf (int  i) string toLowerCase () String toUpperCase () string concat (String str)

2. Case:

1  Packagecn.itcast_05;2 3 /*4 * Conversion function of string:5 * byte[] getBytes (): converts the string to a byte array . 6 * char[] ToCharArray (): converts a string to a character array . 7 * static string ValueOf (char[] CHS): turns the character array into a string . 8 * static string valueOf (int i): turns data of type int into a string . 9 * Note: The valueof method of the string class can turn any type of data into a string. Ten * String toLowerCase (): turns the string into lowercase .  One * String toUpperCase (): turns the string into uppercase .  A * String concat (String str): concatenation of strings .  -  */ -  Public classStringdemo { the      Public Static voidMain (string[] args) { -         //defines a String object -String s = "Javase"; -  +         //byte[] GetBytes (): Converts the string to a byte array.  -         byte[] Bys =s.getbytes (); +          for(intx = 0; x < bys.length; X + +) { A System.out.println (bys[x]); at         } -System.out.println ("----------------"); -  -         //char[] ToCharArray (): Converts a string to a character array.  -         Char[] CHS =S.tochararray (); -          for(intx = 0; x < chs.length; X + +) { in System.out.println (chs[x]); -         } toSystem.out.println ("----------------"); +  -         //static string ValueOf (char[] CHS): Turns the character array into a string.  theString SS =string.valueof (CHS); * SYSTEM.OUT.PRINTLN (ss); $System.out.println ("----------------");Panax Notoginseng  -         //static string valueOf (int i): turns data of type int into a string.  the         inti = 100; +String SSS =string.valueof (i); A System.out.println (SSS); theSystem.out.println ("----------------"); +  -         //string toLowerCase (): Turns the string into lowercase.  $System.out.println ("toLowerCase:" +s.tolowercase ()); $System.out.println ("s:" +s); -         //System.out.println ("----------------"); -         //string toUpperCase (): Turns the string into uppercase.  theSystem.out.println ("toUpperCase:" +s.touppercase ()); -System.out.println ("----------------");Wuyi  the         //String concat (String str): Concatenation of strings.  -String S1 = "Hello"; WuString s2 = "World"; -String s3 = S1 +S2; AboutString S4 =s1.concat (S2); $System.out.println ("S3:" +S3); -System.out.println ("S4:" +S4); -     } -}

Operation Result:

Java Fundamentals Hardening the conversion function of the string class of the 35:string class