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。

程序分析：利用while语句,条件为输入的字符不为 '\n '.

import java.util.Scanner;
public class ex7 {
    public static void main(String args[])
    {
        System.out.println("请输入字符串：");
        Scanner scan=new Scanner(System.in);
        String str=scan.next();
        String E1="[\u4e00-\u9fa5]";
        String E2="[a-zA-Z]";
        int countH=0;
        int countE=0;
        char[] arrChar=str.toCharArray();
        String[] arrStr=new String[arrChar.length];
        for (int i=0;i<arrChar.length ;i++ )
        {
            arrStr[i]=String.valueOf(arrChar[i]);
        }
        for (String i: arrStr )
        {
            if (i.matches(E1))
            {
                countH++;
            }
            if (i.matches(E2))
            {
                countE++;
            }
        }
        System.out.println("汉字的个数"+countH);
        System.out.println("字母的个数"+countE);
    }
}