写出一个程序，接受一个有字母和数字以及空格组成的字符串，和一个字符，然后输出输入字符串中含有该字符的个数。不区分大小写。
import java.util.Scanner;
class Main { public static void main (String[] args) { Scanner s = new Scanner(System.in); String st = null; char c = ‘ ‘; int count = 0; while (s.hasNext()) { st = s.next(); c = s.next().charAt(0); } for (int i = 0; i < st.length(); i ++) { if (st.charAt(i) == c) { count ++; } } System.out.println(count); }}import java.util.*;
public class Main { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner in = new Scanner(System.in); while (in.hasNext()) { String str1 = in.next(); String str2=in.next(); int cnt=0; for(int i=0;i<str1.length();i++) { if (str1.charAt(i)==str2.charAt(0)) { cnt++; } } System.out.println(cnt); } in.close(); }}原文：http://www.cnblogs.com/bb3q/p/5063459.html