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package IOTest;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeMap;
/*
* 10.把当前文件中的所有文本拷贝，存入一个txt文件，统计每个字符出现的次数并输出
*/
public class Test1 {
public static void main(String[] args) {
BufferedReader br=null;
BufferedWriter bw=null;
try {
br=new BufferedReader(new FileReader("e:/q/info.txt"));
bw=new BufferedWriter(new FileWriter("e:/q/inx.txt"));
TreeMap<Character,Integer> tm=new TreeMap<Character,Integer>(new Comp());
int count=0;
for (int i = 0; (i=br.read())!=-1;) {
Integer value=tm.get((char)i);//获取集合中的值
if(value!=null)//如果集合中没有该字母，则存入
count=value;
count++;
tm.put((char)i,count);//存入键值对
count=0;//复位计数变量
}
Iterator<Character> it=tm.keySet().iterator();
while (it.hasNext()) {
Character character = it.next();
Integer it1=tm.get(character);
bw.write(character+"("+it1+")");
}
bw.flush();
} catch (IOException e) {
throw new RuntimeException("读写文件失败");
}finally{
try {
if (br==null) {
br.close();
}
} catch (IOException e2) {
throw new RuntimeException("读取流关闭失败");
}
try {
if (bw==null) {
bw.close();
}
} catch (IOException e2) {
throw new RuntimeException("写入流关闭失败");
}
}
}
}
class Comp implements Comparator<Character>{
@Override
public int compare(Character o1, Character o2) {
return o1.compareTo(o2);
}
}

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