每天一個java小程序-7

 JAVA練習題，能做多少就做多少。http://bbs.csdn.net/topics/110067294

這個是從CSDN看到的。每天一個吧 。

【程序7】 
題目：輸入一行字符，分別統計出其中英文字母、空格、數字和其它字符的個數。 
1.程序分析：利用while語句,條件爲輸入的字符不爲'\n'. 

偷工減料不做中文判斷了。。。。

==== 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("請輸入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);

}

}