أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
import java.io.*;
import java.util.*;
public class FILE_CGI {
String file_name;
public FILE_CGI(String file_name)
{
this.file_name = file_name+".txt";
}
public static boolean deleteFile(String fname)
{
boolean exists = new File(fname).delete();
return exists;
}
public static void test(String filename)
{
System.out.println("the following File "+filename+" is"+filename+(deleteFile(filename)?"is Deleted":"does not Exists"));
}
public static void create_file(String fname)
{
try {
if(new File(fname).createNewFile())
{
System.out.println(fname+" file is created");
}
else
{
System.out.println("Error Occured while creating file");
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void readFile(String filename)
{
FileInputStream fis = null;
try {
fis = new FileInputStream(filename);
byte[] buffer = new byte[];
int total=0;
int reads=0;
while((reads = fis.read(buffer))!= -1)
{
System.out.println(new String(buffer));
total += reads;
}
System.out.println("Total "+total+" bytes are read");
}catch(FileNotFoundException e)
{
System.out.println(e);
}
catch(IOException e)
{
System.out.println(e);
}
finally
{
try
{
if(fis!=null)
{
fis.close();
}
}catch(IOException e)
{
System.out.println(e);
}
}
}
public void writeFile(String fname)
{
BufferedWriter bw = null;
try {
FileWriter fw = new FileWriter(fname);
bw = new BufferedWriter(fw);
System.out.println("Enter the text you want to write in "+fname+" file");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
//HERE STREAM AUTOMATICALLY GETS CLOSED
String str= br.readLine();
//how to read a string that contains new line paragraphs 'enter' etc
bw.write(str);
bw.newLine();
bw.write("End of File");
br.close();
}catch(IOException e)
{
e.printStackTrace();
}
finally {
try {
if(bw!=null)
{
bw.close();
}
}catch(IOException e)
{
e.printStackTrace();
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
String choice = null ;
Scanner sc = new Scanner(System.in);
System.out.println("Enter file name:");
String fn = sc.nextLine();
FILE_CGI fc = new FILE_CGI(fn);
create_file(fc.file_name);
fc.writeFile(fc.file_name);
System.out.println("Reading the file "+fc.file_name+" .");
fc.readFile(fc.file_name);
//STREAM IS CLOSED EXCEPTION IS THROWN ERROR DELETING THE FILE
System.out.println("Want to delete "+fc.file_name+" file");
try {
choice = sc.next();
}catch(Exception e)
{
System.out.println(e);
}
if(choice=="yes")
{
test(fc.file_name);
}
else
{
System.out.println("EXIT");
}
sc.close();
}
}
i want to know why i could'nt enter string in the following lines
Note: Occurence of Exception is in Main() method following statements.
/STREAM IS CLOSED EXCEPTION IS THROWN ERROR DELETING THE FILE
System.out.println("Want to delete "+fc.file_name+" file");
try {
choice = sc.next();
}catch(Exception e)
{
System.out.println(e);
}
if(choice=="yes")
{
test(fc.file_name);
}
else
{
System.out.println("EXIT");
}
sc.close();
