JAVA11-5 conversion capabilities of the String class

The conversion function of string:
Byte[] GetBytes (): Converts the string to a byte array.
Char[] ToCharArray (): Converts a string to a character array.
static string ValueOf (char[] CHS): Turns the character array into a string.
static string valueOf (int i): turns data of type int into a string.
Note: The valueof method of the string class can turn any type of data into a string.
String toLowerCase (): Turns the string into lowercase.
String toUpperCase (): Turns the string into uppercase.
String concat (String str): Concatenation of strings.

1  Public classStringTest1 {2 3  Public Static voidMain (string[] args) {4String s = "Java";5 6 //byte[] GetBytes (): Converts the string to a byte array. If you go to an array, you need to traverse7 byte[] B =s.getbytes ();8  for(intX=0;x<s.length (); x + +){9System.out.println (B[x]);//Convert to ASCII code tableTen } OneSystem.out.println ("-------------"); A  - //char[] ToCharArray (): Converts a string to a character array. If you go to an array, you need to traverse - Char[] CA =S.tochararray (); the  for(intX=0;x<s.length (); x + +){ - System.out.println (ca[x]); - } -System.out.println ("-------------"); +  - //static string ValueOf (char[] CHS): Turns the character array into a string.  +String S1 = s.valueof (CA);//call the character array formed above ASystem.out.println ("ValueOf:" +s1); atSystem.out.println ("-------------"); -  - //static string valueOf (int i): turns data of type int into a string.  - inti = 100; -String s2 =s.valueof (i); -SYSTEM.OUT.PRINTLN ("valueOf int:" +S2);//The 100 here has become a string. inSystem.out.println ("-------------"); -  to //string toLowerCase (): Turns the string into lowercase.  +String s3 = S.tolowercase ();//to create a new array -System.out.println ("toLowerCase:" +S3); theSystem.out.println ("s:" +s);//s itself has not changed * //string toUpperCase (): Turns the string into uppercase.  $String S4 =s.touppercase ();Panax NotoginsengSystem.out.println ("toUpperCase:" +S4); -System.out.println ("-------------"); the  + //String concat (String str): Concatenation of strings.  AString SS1 = "Person"; theString SS2 = "Sleep"; +String SS3 = Ss1+ss2;//recommend this, convenient -System.out.println ("The first way of stitching:" +SS3); $String SS4 =Ss1.concat (SS2); $System.out.println ("Splicing of the second way:" +ss4); -  -  the } - Wuyi } the  - /* Wu Requirement: The first letter of a string is capitalized and the remainder is lowercase. (only English uppercase and lowercase characters are considered) - Analysis: About A: Intercept the first letter of a string//preserve String type $ B: Intercept the remaining letters//keep String type - C: Change A to uppercase - D: Change B to lowercase - E: Splicing C and D together A */ +  Public classStringTest2 { the  -  Public Static voidMain (string[] args) { $ //Define a string theString s = "Java SE"; the  the //A: Intercept the first letter of a string//Preserve String Type theString A = s.substring (0,1);//get a string type for easy stitching later - //int a = S.charat (0); This method obtains the ASCII code table, the INT type in  the //B: Intercept the remaining letters.//Preserve String Type theString B = s.substring (1); About  the //C: Change A to uppercase theString C =a.touppercase (); the  + //D: Change B to lowercase -String D =b.tolowercase (); the Bayi //E: Splicing C and D together theString E = c+D; theSystem.out.println (E);//Java se -  - //a more convenient approach, chained: the System.out.println ( theS.substring (0,1). toUpperCase (). theConcat (s.substring (1). toLowerCase ()) the);//Java se - } the  the}

JAVA11-5 conversion capabilities of the String class