輸出一個字符串里面的空格，字母還有數(shù)字的數(shù)目：


馬克- to-win：馬克 java社區(qū)：防盜版實(shí)名手機(jī)尾號： 73203。
public class Test {
    public static void main(String[] args) throws IndexOutOfBoundsException {
        String a = "I am a student whose age is 20";
        shumu(a); //輸出字符串空格和字母還有數(shù)字的數(shù)目。
    }

    static void shumu(String a) {
        int shuzi = 0, zimu = 0, kongge = 0;
        char[] c = new char[a.length()];
        for (int i = 0; i < a.length(); i++) {





/*下面這句話是java自帶的函數(shù)，意思是對于某一個字符串,取出某個位置的字符。@馬克-to-win*/
            c[i] = (char) a.codePointAt(i);
            if (c[i] >= '0' && c[i] <= '9') {
                shuzi++;
            }
            if ((c[i] >= 'A' && c[i] <= 'Z') || (c[i] >= 'a' && c[i] <= 'z')) {
                zimu++;
            }
            if (c[i] == ' ') {
                kongge++;
            }
        }
        System.out.println("數(shù)字的個數(shù)為：　" + shuzi);
        System.out.println("字母的個數(shù)為：　" + zimu);
        System.out.println("空格的數(shù)目為：　" + kongge);
    }
}