1 package demo; 2 import java.util.Scanner; 3 /** 4  * 统计一个字符串中英文字母、空格、数字和其它字符的个数 5  */ 6 public class Statistics1 {  7      public static void main(String[]args){  8          int i;  9          int LetterCount = 0; 10          int SpaceCount = 0; 11          int NumberCount = 0; 12          int OtherCount = 0; 13           14          //输入一个字符串 15          Scanner in = new Scanner(System.in); 16          System.out.println("请输入一个字符串:"); 17          String str = in.nextLine(); 18           19          //字符串转换成字符数组 20          char[]ch = str.toCharArray(); 21          for(i = 0; i<str.length();i++){ 22              if(Character.isLetter(ch[i])){ 23                  LetterCount++; 24              }else if(Character.isSpaceChar(ch[i])){ 25                  SpaceCount++; 26              }else if(Character.isDigit(ch[i])){ 27                  NumberCount++; 28              } 29              else{ 30                  OtherCount++; 31              } 32          } 33           34          System.out.println("字符的个数为:"+LetterCount); 35          System.out.println("空格的个数为:"+SpaceCount); 36          System.out.println("数字的个数为:"+NumberCount); 37          System.out.println("其他字符个数为:"+OtherCount); 38      } 39  }