我写了2个方法 - 写入方法和读取方法。它们工作正常,但我想将它们组合起来,使它们像我写的伪代码一样工作:
prompt user for input filename
open input file
prompt user for output filename
open output file
while there are lines in the input file
read a line
print it to screen
writeit to the output file
close the input file
close the output file
我尝试了一些不同的版本,但我似乎无法让它发挥作用?
阅读方法:
public void readFile()
{
FileReader fileReader = null;
BufferedReader bufferedReader = null;
String InputFileName;
String nextLine;
clrscr();
System.out.println("Please enter the name of the file that is to be READ (e.g. aFile.txt: ");
InputFileName = Genio.getString();
try
{
fileReader = new FileReader(InputFileName);
bufferedReader = new BufferedReader(fileReader);
nextLine = bufferedReader.readLine();
while (nextLine != null)
{
System.out.println(nextLine);
nextLine = bufferedReader.readLine();
}
}
catch (IOException e)
{
System.out.println("Sorry, there has been a problem opening or reading from the file");
}
finally
{
if (bufferedReader != null)
{
try
{
bufferedReader.close();
}
catch (IOException e)
{
System.out.println("An error occurred when attempting to close the file");
}
}
}
}
写入方法:
public void writeFile()
{
String myString;
clrscr();
System.out.println("Begin typing the contents to you wish to WRITE to file: ");
myString = Genio.getString();
System.out.println("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
FileOutputStream outputStream = null;
PrintWriter printWriter = null;
try
{
outputStream = new FileOutputStream("writing.txt");
printWriter = new PrintWriter(outputStream);
printWriter.write(myString);
printWriter.println("\n");
// write information to the file via the PrintWriter
while (!myString.equals(""))
{
myString = Genio.getString();
printWriter.print(myString + "\n");
}
System.out.println("File: 'writing.txt' has been saved with the contents above.\n\nYou can now open this file using the other options in the menu screen.");
pressKey();
}
catch (IOException e)
{
System.out.println("Sorry, there has been a problem opening or writing to the file");
}
finally
{
if (printWriter != null)
{
printWriter.close();
}
}
}
处理用户输入的Genio类:
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Genio
{
public Genio()
{
}
private static String getStr()
{
String inputLine = "";
BufferedReader reader =
new BufferedReader(new InputStreamReader(System.in));
try
{
inputLine = reader.readLine();
}
catch(Exception exc)
{
System.out.println ("There was an error during reading: "
+ exc.getMessage());
}
return inputLine;
}
public static int getInteger()
{
int temp=0;
boolean OK = false;
BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
do
{
try
{
temp = Integer.parseInt(keyboard.readLine());
OK = true;
}
catch (Exception eRef)
{
if (eRef instanceof NumberFormatException)
{
System.out.print("Integer value needed: ");
}
else
{
System.out.println("Please report this error: "+eRef.toString());
}
}
} while(OK == false);
return(temp);
}
public static float getFloat()
{
float temp=0;
boolean OK = false;
BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
do
{
try
{
temp = Float.parseFloat(keyboard.readLine());
OK = true;
}
catch (Exception eRef)
{
if (eRef instanceof NumberFormatException)
{
System.out.print("Number needed: ");
}
else
{
System.out.println("Please report this error: "+eRef.toString());
}
}
} while(OK == false);
return(temp);
}
public static double getDouble()
{
double temp=0;
boolean OK = false;
BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
do
{
try
{
temp = Double.parseDouble(keyboard.readLine());
OK = true;
}
catch (Exception eRef)
{
if (eRef instanceof NumberFormatException)
{
System.out.print("Number needed: ");
}
else
{
System.out.println("Please report this error: "+eRef.toString());
}
}
} while(OK == false);
return(temp);
}
public static char getCharacter()
{
String tempStr="";
char temp=' ';
boolean OK = false;
do
{
try
{
tempStr = getStr();
temp = tempStr.charAt(0);
OK = true;
}
catch (Exception eRef)
{
if (eRef instanceof StringIndexOutOfBoundsException)
{
// means nothing was entered so prompt ...
System.out.print("Enter a character: ");
}
else
{
System.out.println("Please report this error: "+eRef.toString());
}
}
} while(OK == false);
return(temp);
}
public static String getString()
{
String temp="";
try
{
temp = getStr();
}
catch (Exception eRef)
{
System.out.println("Please report this error: "+eRef.toString());
}
return(temp);
}
}