就这么一小个程序也出这么多错，大侠帮我呀

Question

还是这样
D:\javacode>javac ReadFromFile.java
ReadFromFile.java:12: ')' expected
                while((char ch = (char)System.in.read())!='\n')
                            ^
ReadFromFile.java:17: illegal start of expression
                File dir = new File(stfDir.toString());
                                                      ^
ReadFromFile.java:23: ')' expected
                while((char ch = (char)System.in.read())!='\n')
                            ^
ReadFromFile.java:28: illegal start of expression
                File readFrom = new File(dir,stfFilename.toString());
                                                                    ^
ReadFromFile.java:12: incompatible types
found   : char
required: boolean
                while((char ch = (char)System.in.read())!='\n')
                      ^
ReadFromFile.java:23: incompatible types
found   : char
required: boolean
                while((char ch = (char)System.in.read())!='\n')
                      ^
ReadFromFile.java:31: cannot resolve symbol
symbol  : variable readFrom
location: class ReadFromFile
                if(readFrom.isFile() && reafFrom.canWrite() && reafFrom.canRead(
))
                   ^
ReadFromFile.java:31: cannot resolve symbol
symbol  : variable reafFrom
location: class ReadFromFile
                if(readFrom.isFile() && reafFrom.canWrite() && reafFrom.canRead(
))
                                        ^
ReadFromFile.java:31: cannot resolve symbol
symbol  : variable reafFrom
location: class ReadFromFile
                if(readFrom.isFile() && reafFrom.canWrite() && reafFrom.canRead(
))
                                                               ^
ReadFromFile.java:35: cannot resolve symbol
symbol  : variable readFrom
location: class ReadFromFile
new RandomAccessFile(readFrom,"rw");
                     ^
ReadFromFile.java:38: cannot resolve symbol
symbol  : variable file
location: class ReadFromFile
                                System.out.println(file.readLine());
                                                   ^
11 errors

Answer 1

method readFrom() does not exist

Answer 2

tryint ch;
while((ch = System.in.read())!='\n')
{
 stfFilename.appendChar((char)ch);
}

Answer 3

（char)(System.in.read())
而非(char)System.in.read
我觉得是这儿出了问题。

Answer 4

当然能不能一个String对象cast到一个char对象，那又是另外
一回事了。只是这儿你的char强制转换的似乎是System

Answer 5

While((char ch = (char)System.in.read())!='\n')
改为：
char ch;
while((ch = (char)System.in.read())!='\n')
就ok了！我调试过的！

Answer 6

import java.io.*;
public class ReadFromFile {
String  ch;
  public ReadFromFile() {  }
  public static void main(String[] args) {
  try{
    System.out.println("Please enter a directory that the file located in:");
//构造待读取文件的目录
StringBuffer stfDir = new StringBuffer();
//从键盘获取输入字符，存储进入字符缓冲区
                char ch = (char)System.in.read();
                while(ch!='\n')
{
                 stfDir.append(ch);
}
//创建目录文件对象
File dir = new File(stfDir.toString());
System.out.println("Please enter a filename that want to read:");
//获取待读取的文件名
StringBuffer stfFilename = new StringBuffer();
//从键盘获取输入字符，存储进入字符缓冲区
while(ch !='\n')
{
stfFilename.append(ch);
}
//创建文件对象
File readFrom = new File(dir,stfFilename.toString());
//判断文件是否为目录、是否具有写权限、读权限
if(readFrom.isFile() && readFrom.canWrite() && readFrom.canRead())
{
//创建RandomAccessFile对象
RandomAccessFile rafFile =
new RandomAccessFile(readFrom,"rw");
//如果未读到文件尾，则继续读取
while(rafFile.getFilePointer()<rafFile.length())
System.out.println(rafFile.readLine());
//文件关闭
rafFile.close();
}
else
System.out.println("File cann't be read!");
}        catch(IOException ex)
        {
      System.err.println(ex.getMessage() );
      }
}}这样就好了！god bless you!