new BufferedReader(
new FileReader("data.txt"));
while ((s1=in.readLine())!=null)
{
j=numberTokenizer(s1);
mp.put(j,s1);
}
try{
if(mp.containsKey( String.valueOf(deleteNumber).toString()))
{
mp.remove(deleteNumber);
}else
throw new NumberNotFoundException();
Collection c = mp.values();
Iterator iter = c.iterator();
while(iter.hasNext())
{
s1 = (String)iter.next();
s3 +=s1+"\n";
}
BufferedReader in2 =
new BufferedReader(
new StringReader(s3));
PrintWriter out =
new PrintWriter(
new BufferedWriter(
new FileWriter("data.txt")));
//System.out.println("delete No"+deleteNumber);
while( (s1 = in2.readLine())!=null)
{
out.println(s1);
}
out.close();
}catch (NumberNotFoundException e)
{
isDelete = false;
System.out.println(deleteNumber+" no found :(");
}
}catch(IOException e){}
}
public long numberTokenizer(String s)
throws IOException
{
StringTokenizer st =
new StringTokenizer(s," ");
return Integer.valueOf((st.nextToken())).longValue();
}
public void findData(long find)//查找数据
throws IOException,NumberNotFoundException
{
isFind = true;
String s = "",findString ="";
long i;
DataMap dm = new DataMap();
BufferedReader in =
new BufferedReader(
new FileReader("data.txt"));
while ((s=in.readLine())!=null)
{
i=numberTokenizer(s);
dm.put(i,s);
}
//in.close();
try{
if(dm.containsKey( String.valueOf(find).toString()))
{
findString = dm.get(find);
System.out.println("学号"+find+"学生的资料是:");
System.out.println(findString);
}else
throw new NumberNotFoundException();
}catch (NumberNotFoundException e){
System.out.println(find+" no found :(");
isFind = false;
}
}
public static void print()//读取文本文件把数据打印到终端的方法
throws IOException
{
try{
BufferedReader in =

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