Java Loop Exercise: Enter a string that counts how many digits, how many letters, and how many other characters the string contains.

Package practicego;import java.util.scanner;/* * 3. Enter a string that counts how many digits, how many letters, and how many other characters are contained in the string.  */public class cto {public static void main (String[] args)  {         int englishCount = 0;//  English alphabet number          int spaceCount = 0;//  Number of spaces          int numCount = 0;//  number          int otherCount = 0;//  number of other characters         scanner  sc = new scanner (system.in);         System.out.println ("Please enter a line of characters:");        string str =  Sc.nextline ();//  get console input one line of characters         char[] ch =  Str.tochararray ();//  The string you have taken into aA char array         for  (int i = 0; i <  ch.length; i++)  {            if   (Character.isletter (ch[i))  {                 //  determine if it is a letter                  englishCount++;             } else if  (Character.isspacechar (ch[i))  {                 //  determine if it is a space                  spaceCount++;             } else if  (Character.isdigit (ch[i))  {                 //  Judging whether it is digital                  numCount++;             } else {                 //  above are not considered to be other characters                  otherCount++;             }        }         system.out.println ("Number of Letters:"  + englishcount);         system.out.println ("Number of Numbers:"  + numcount);         System.out.println ("Number of Spaces:"  + spacecount);         System.out.println ("Number of other characters:"  + othercount);     }} 

Test:

Please enter a line of characters: [email protected] Number of letters: 9 Number of Numbers: 8 Number of spaces: 0 Number of other characters: 2

Please enter a line of characters: YEQC @@@123456aaa number of letters: 7 Number of digits: 6 Number of spaces: 2 Number of other characters: 3

Note: There are three classes in Java that are responsible for manipulating characters: Character, String, StringBuffer. Where the character class operates on a single character, string is an operation on a sequence of characters, and StringBuffer is an operation on a string of characters.

Statement of the 1.Character

Public final class Character extends Object implements Serializable,comparable<character>

How to construct 2.Character

Public Character (char) {}

3. Common methods

ToString () method

4. Normally, when we use characters, we sometimes need to use the characters of the original data type

char ch = ' a '; char Unichar = ' \u039a '; char[] Chararray = {' A ', ' B ', ' C ', ' d ', ' e '};

The 5.Character class provides some useful classes (that is, static) methods to manipulate characters. You can create a character for a character-constructed object

Character ch1 = new Character (' a ');

Java Loop Exercise: Enter a string that counts how many digits, how many letters, and how many other characters the string contains.