每天一个java小程序-7

 JAVA练习题，能做多少就做多少。http://bbs.youkuaiyun.com/topics/110067294

这个是从优快云看到的。每天一个吧 。

【程序7】 
题目：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。 
1.程序分析：利用while语句,条件为输入的字符不为'\n'. 

偷工减料不做中文判断了。。。。

==== Main.java ====

package main;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class Main {

public static void main(String[] args) {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

byte[] bytes = null;

int en = 0, num = 0, space = 0, others = 0;

int i;

String a = "";

System.out.println("请输入A:");

try {

a = br.readLine();

} catch (IOException e) {

e.printStackTrace();

}

bytes = a.getBytes();

for (i = 0; i < bytes.length; i++) {

char b = (char) bytes[i];

if ((b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z')) {

en++;

} else if (b >= '0' && b <= '9') {

num++;

} else if (b == ' ') {

space++;

} else {

others++;

}

}

System.out.println("En is " + en);

System.out.println("Num is " + num);

System.out.println("Space is " + space);

System.out.println("Others is " + others);

}

}