在C盘新建文件1.txt，输入任意字符，如下图：
编写java代码。如下：
import?java.io.BufferedReader;import?java.io.FileNotFoundException;
import?java.io.FileReader;
import?java.io.IOException;
import?java.util.TreeMap;
public?class?Test?{
//?统计数字或者字符出现的次数
public?static?TreeMap<Character,?Integer>?Pross(String?str)?{
char[]?charArray?=?str.toCharArray();
TreeMap<Character,?Integer>?tm?=?new?TreeMap<Character,?Integer>();
for?(int?x?=?0;?x?<?charArray.length;?x++)?{
if?(!tm.containsKey(charArray[x]))?{
tm.put(charArray[x],?1);
}?else?{
int?count?=?tm.get(charArray[x])?+?1;
tm.put(charArray[x],?count);
}
}
return?tm;
}
public?static?void?main(String[]?args)?{
BufferedReader?br?=?null;
int?line?=?0;
String?str?=?"";
StringBuffer?sb=?new?StringBuffer();
try?{
br?=?new?BufferedReader(new?FileReader("c:\\1.txt"));
while?((str?=?br.readLine())?!=?null)?{
sb.append(str);
++line;
}
System.out.println("\n文件行数:?"?+?line);
System.out.println("\n文件内容:?"?+?sb.toString());
TreeMap<Character,?Integer>?tm?=?Pross(sb.toString());
System.out.println("\n字符统计结果为："?+?tm);
}?catch?(FileNotFoundException?e)?{
e.printStackTrace();
}?catch?(IOException?e)?{
e.printStackTrace();
}?finally?{
if?(br?!=?null)?{
try?{
br.close();
}?catch?(IOException?e)?{
//?TODO?Auto-generated?catch?block
e.printStackTrace();
}
}
}
}
}运行结果如下图：