issue with FileReader and FileWriter

[Uma R]

hi all,
please help me here

I am getting a unwanted answered to write and read to file .
Below is the code of it

The size of array is coming as -1 and hence if retrieve values from the array also, it is displaying null.

package chap6;

import java.io.*;

public class Chap61 {
public Chap61() {
}

public static void main(String[] args) {
try {
// char [] n = new char[50];

int size = 0;
boolean newFile = false;

File file = new File("testFile.doc");
System.out.println("file exists:" + file.exists());
file.createNewFile();
//below is to wrap the file with FileWriter
BufferedWriter bw= new BufferedWriter(file);
bw.write("uma");
// FileWriter nf = new FileWriter(file);
// nf.write("first");
System.out.println("new fiel created" + newFile);
System.out.println("file exists:" + file.exists());
//below is to wrap the file with FileWriter
// FileReader fr = new FileReader(file);
BufferedReader br= new BufferedReader();
size=br.read(n);
//size = fr.read(n);
System.out.println("new file size is :" + size);
for (char c: n) {
System.out.print("characters are :" + c + "\n");
}

} catch (IOException ex) {
ex.printStackTrace();
}


}
}

result of the array is :
new file size is :-1


Please let me know where I am going wrong

Thanks
Uma

[masijade]

The "read" method returns -1 at EOF, which will happen immediately when you create a BufferedReader that doesn't wrap anything.

[RamyaSivakanth]

I don't think your code is compiling.Please try to correct the compilation errors first.

[Uma R]

thanks for the reply ,

my code is compiling fine and is still giving me the size as -1.

Please help me to solve this

[masijade]

What do you not understand from reply #1? You are creating a BufferedReader that doesn't wrap anything. I.E. A BufferedReader that isn't reading anything. What is the purpose of that?

[JosAH]

Just to help the previous replier; here:

BufferedReader br= new BufferedReader(); // <--- this wraps nothing
size=br.read(n); // <--- so this read returns -1

kind regards,

Jos

[rkumar]

try to use below code.

package chap6;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Chap61 {
public Chap61()
{
}

public static void main(String[] args)
{
try {
// char [] n = new char[50];
int size = 0;
boolean newFile = false;
File file = new File("C://testFile.doc");
System.out.println("file exists:" + file.exists());
file.createNewFile();
// below is to wrap the file with FileWriter
//FileOutputStream fos = new FileOutputStream(file);
FileWriter fw = new FileWriter(file);
BufferedWriter bw= new BufferedWriter(fw);
bw.write("uma");
bw.flush();
bw.close();
// FileWriter nf = new FileWriter(file);
// nf.write("first");
System.out.println("new fiel created" + newFile);
System.out.println("file exists:" + file.exists());
// below is to wrap the file with FileWriter
// FileReader fr = new FileReader(file);
FileReader fr = new FileReader(file);
BufferedReader br= new BufferedReader(fr);
size=br.read();
// size = fr.read(n);
System.out.println("new file size is :" + size);
/* for (char c: n)
{
System.out.print("characters are :" + c + "\n");
}*/
}
catch (IOException ex)
{
ex.printStackTrace();
}


}
}