String string running group

 1 /**

 2  * THis_is_a_cat

 3  * This Is A Cat

 4  *

 5  * Cat A Is This

 6  * @author Administrator

 7  *

 8 */

 9 public  class Test07Str {

10 public static void main(String[] args) {

11 String s="THiS_is_a_cat";

12 //Split

13 String[] arr =s.split("_");

14 //Declare new string

15 // String sumStr="";

16 String sumStr=new String();

17 //Add directly to sumStr when traversing

18 for(int i=0;i){

19 // System.out.println(arr[i].substring(0, 1).toUpperCase());

20 // System.out.println(arr[i].substring(1).toLowerCase());

21 sumStr+=arr[i].substring(0, 1).toUpperCase()+arr[i].substring(1).toLowerCase ()+" ";

22 }

23 System.out.println("Converted:"+ sumStr);

24

25 System.out.println("---------------------- ---");

26 //Empty it

27 sumStr="";

28 for(int i=arr.length-1;i>=0;i--){

29 sumStr+=arr[i].substring(0, 1).toUpperCase()+arr[i].substring( 1).toLowerCase()+" ";

30 }

31 System.out.println("Converted:"+ sumStr);

32 }

33 }

Split(Split character or regular expression); Return value String[]Array

SubString() :Intercept substring

SubString( from), The range of intercepted substring[from, len-1] FromfromIntercept to the end

SubString(from,to) , the intercepted sub String range:[from, to) Left closed, right open, interception The number of characters in the substring= to-from

toUpperCase() :turn to uppercase

< /p>

toLowerCase():: turn to lowercase

< /p>

StringBuffer/StringBuild: Variable character sequence

Append(): Can be used for string splicing

 1 /**

 2  * THis_is_a_cat

 3  * This Is A Cat

 4  *

 5  * Cat A Is This

 6  * @author Administrator

 7  *

 8 */

 9 public  class Test07Str {

10 public static void main(String[] args) {

11 String s="THiS_is_a_cat";

12 //Split

13 String[] arr =s.split("_");

14 //Declare new string

15 // String sumStr="";

16 String sumStr=new String();

17 //Add directly to sumStr when traversing

18 for(int i=0;i){

19 // System.out.println(arr[i].substring(0, 1).toUpperCase());

20 // System.out.println(arr[i].substring(1).toLowerCase());

21 sumStr+=arr[i].substring(0, 1).toUpperCase()+arr[i].substring(1).toLowerCase ()+" ";

22 }

23 System.out.println("Converted:"+ sumStr);

24

25 System.out.println("---------------------- ---");

26 //Empty it

27 sumStr="";

28 for(int i=arr.length-1;i>=0;i--){

29 sumStr+=arr[i].substring(0, 1).toUpperCase()+arr[i].substring( 1).toLowerCase()+" ";

30 }

31 System.out.println("Converted:"+ sumStr);

32 }

33 }