输入一行字符，分别统计出其中英文字母、空格、数字和其它字符的个数

import java.util.Scanner;
public class Prog7_1{
  public static void main(String[] args){
    System.out.print("请输入一串字符：");
    Scanner scan = new Scanner(System.in);
    String str = scan.nextLine();//将一行字符转化为字符串
    scan.close();
    count(str);
  }
  //统计输入的字符数
  private static void count(String str){
    String E1 = "[\u4e00-\u9fa5]";//汉字
    String E2 = "[a-zA-Z]";
    String E3 = "[0-9]";
    String E4 = "\\s";//空格
    int countChinese = 0;
    int countLetter = 0;
    int countNumber = 0;
    int countSpace = 0;
    int countOther = 0;
    char[] array_Char = str.toCharArray();//将字符串转化为字符数组
    String[] array_String = new String[array_Char.length];//汉字只能作为字符串处理
    for(int i=0;i<array_Char.length;i++)
      array_String[i] = String.valueOf(array_Char[i]);
    //遍历字符串数组中的元素
    for(String s:array_String){
      if(s.matches(E1))
        countChinese++;
      else if(s.matches(E2))
        countLetter++;
      else if(s.matches(E3))
        countNumber++;
      else if(s.matches(E4))
        countSpace++;
      else
        countOther++;
    }
    System.out.println("输入的汉字个数："+countChinese);
    System.out.println("输入的字母个数："+countLetter);
    System.out.println("输入的数字个数："+countNumber);
    System.out.println("输入的空格个数："+countSpace);
    System.out.println("输入的其它字符个数："+countSpace);
  }
}

import java.util.*;
public class Prog7_2{
  public static void main(String[] args){
    System.out.println("请输入一行字符：");
    Scanner scan = new Scanner(System.in);
    String str = scan.nextLine();
    scan.close();
    count(str);
  }
  //统计输入的字符
  private static void count(String str){
    List<String> list = new ArrayList<String>();
    char[] array_Char = str.toCharArray();
    for(char c:array_Char)
      list.add(String.valueOf(c));//将字符作为字符串添加到list表中
    Collections.sort(list);//排序
    for(String s:list){
      int begin = list.indexOf(s);
      int end = list.lastIndexOf(s);
      //索引结束统计字符数
      if(list.get(end)==s)
        System.out.println("字符‘"+s+"’有"+(end-begin+1)+"个");
    }
  }
}