方法

创建字符串接收器，接收用户输入的字符串，然后将其转换为字符串数组，安装字符对应的字节码进行判断。

代码

import java.io.*;
public class StaticsChar 
{
	public static void main(String[] args) throws IOException
	{
		String zifuchuan = new String("");
		int hanzishu=0;
		int zimu=0;
		int kongge=0;
		int shuzi=0;
		int qita=0;
		System.out.print("请输入一行字符串：");
		BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
		zifuchuan=stdin.readLine();
		byte[] bytes = zifuchuan.getBytes();
		for(int i=0;i<bytes.length;i++)
		{
			if((bytes[i]>=65 && bytes[i]<=90)||(bytes[i]>=97 && bytes[i]<=122))
			{
				zimu++;
			}
			else if(bytes[i]==32)
			{
				kongge++;
			}
			else if(bytes[i]>=48 && bytes[i]<=57)
			{
				shuzi++;
			}
			else if(bytes[i]<0)
			{
				hanzishu++;
			}
			else
			{
				qita++;
			}
			
		}
		System.out.println("字符串所占字节个数为"+bytes.length);
		System.out.println("汉字个数为"+hanzishu/2);
		System.out.println("英文字母个数为"+zimu);
		System.out.println("空格个数为"+kongge);
		System.out.println("数字个数为"+shuzi);
		System.out.println("其它字符个数为"+qita);
		
	}
}

结果