/*
	?*?讀取一個(gè)文檔里的一個(gè)字符出現(xiàn)的次數(shù)
	?*/
	public?static?void?print(String?fileName,String?str){
		try?{
			//?構(gòu)建FileInputStream對(duì)象
			FileInputStream?inputStream?=?new?FileInputStream(fileName);
			//?構(gòu)建InputStreamReader對(duì)象,可以指定編碼格式
			InputStreamReader?reader?=?new?InputStreamReader(inputStream);
			StringBuffer?sb?=?new?StringBuffer();
			while(reader.ready()){
				sb.append((char)reader.read());//?轉(zhuǎn)成char加到StringBuffer對(duì)象中
			}
			int?count?=?0;//出現(xiàn)的次數(shù)
			int?fromIndex?=0;//indexOf中查詢參數(shù)
			while(true){
				fromIndex=sb.indexOf(str,?fromIndex);//返回該字符在文檔中出現(xiàn)的位置,int
				if(fromIndex!=-1){
					//找到了該字符,查詢的索引+1,出現(xiàn)的次數(shù)+1
					fromIndex++;
					count++;
				}else{
					break;
				}
			}
			System.out.println(sb.toString());
			System.out.println(count);
			reader.close();//?關(guān)閉讀取流
			inputStream.close();//?關(guān)閉輸入流,釋放系統(tǒng)資源
		}?catch?(FileNotFoundException?e)?{
			e.printStackTrace();
		}?catch?(IOException?e)?{
			e.printStackTrace();
		}
	}

?System.out.println(new CharCounter().counter("LOVELOVEYOU",'O'));//這一行是什么意思？

public class CharCounter{
public static int counter(String s,char c){
?int count=0;
?for(int i=0;i<s.length();i++){
? if(s.charAt(i)==c){
? ?count++;
? }
?}
?return count;
}
public static void main(String args[]){
?System.out.println(new CharCounter().counter("LOVELOVEYOU",'O'));
}
}