Java开发网 - illegal start of expression错误

Topic: illegal start of expression错误

1.illegal start of expression错误

Posted by: qiuli8848
Posted on: 2005-01-09 08:43

是书上的类,作者认为新手没学会异常处理之前,还是别用标准的IO,他给出的一个类,源码:
import java.io.*;
/**
*A simple input class to read values typed at the command line.if an error
*occurs during input,any exceptiong thrown are caught and a default value
*returned.
*
*@version 1.1 1999.08.18
*@author Graham Roberts
*@author Russel Winder
*/
public class KeyboardInput
{ /**
*the buffered stream that works the keyboard so that we can read
*from it sensibly.
*/
private final BufferedReader in =
new BufferedReader(new InputStreamReader (System.in));
/**
*Read an <CODE>int</CODE> value from keyboard input.
*the default return value is 0.
*/
public final synchronized int readInteger()
{
String input="";
int value=0;
try
{
input=in.readLine();
}
catch (IOException e)
{
if (input !=null)
{
  try
   {
   value =Integer.parseInt(input);
   }
  catch (NumberFormatException e){}
}
  return value;
}
/**
*read a <CODE>long</CODE> value from keyboard input.
*the default return value is 0L.
*/
public final synchronized long readLong()// Angry

错误的就是这一行
//错误是:illegal start of expression
{
String input="";
long value ="0L";
try
{
input=in.readLine();
}
catch (IOException e){}
if (input !=null)
{
try
{
value=Long.parseLong(input);
}
catch (NumberFormatException e){}
}
return value;
}
/**
*Read a<CODE>double</CODE> value from keyborad input.
*the default return value is 0.0.
*/
public final synchronized double readDouble()
{
String input="";
double value=0.0D;
try{
input=in.readLine();
}
catch (IOException e){}
       if (input !=null){
           try{
            value =DoubleparseDouble(input);
           }
            catch (NumberFormatException e){}
           }
            return value;
}
//float,default return value is 0.0F
public final synchronized float readFloat(){
  String input="";
  float value=0.0F;
  try{
    input=in.readLine();
   }
  catch (IOException e){}
  if(input !=null){
    try{
      value=Float.parseFloat(input);
     }
    catch (NumberFormatException e){}
    }
    return value;
  }
//char,default return value is ' '(space).
public final synchronized char readCharacter(){
  char c="";
  try{
   c=(char)in.read();
   }
  catch (IOException e){}
  return c;
}
//String,default return value is ""(the empty string).
public final synchronized String readString(){
  String s="";
  try{
    s=in.readLine();
   }
  catch (IOException e){}
  if(s==null){
      s="";
     }

}
return s;
}

}