FileOutputStream is meant for writing streams of raw bytes such as image data. (from JAVA API)The following are constructors of this class from JAVA API:
FileOutputStream(File file) Creates a file output stream to write to the file represented by the specified File object. |
FileOutputStream(File file, boolean append) Creates a file output stream to write to the file represented by the specified File object. |
FileOutputStream(FileDescriptor fdObj) Creates an output file stream to write to the specified file descriptor, which represents an existing connection to an actual file in the file system. |
FileOutputStream(String name) Creates an output file stream to write to the file with the specified name. |
FileOutputStream(String name, boolean append) Creates an output file stream to write to the file with the specified name. |
SAMPLE CODE:
Let's use the code from the sample code of FileInputStream:
/**
* @(#)ReadFile.java
*
* @JEDI Phase II Course Material
* @With comments insertions from
* @ erlyn manguilimotan
*/
import java.io.*;
public class ReadFile {
public static void main(String args[]){
BufferedReader fileRead = new BufferedReader (new InputStreamReader(System.in));
String fileName = "";
System.out.println("Enter the name of the file to Open");
try{
fileName=fileRead.readLine(); //input the name of the file
}catch(IOException e1){
}//end of catch
FileInputStream rf = null; //create an object for FileInputStream
try{
rf = new FileInputStream(fileName); //connects the object with the file name
}catch(FileNotFoundException e2){
System.out.println("File not found...");
}//end of catch
try{
char data; //variable to hold the data
int temp=0;
do{
temp=rf.read(); // Reads a byte of data from this input stream.
data = (char) temp; //stores the data into variable data
if(temp!=-1) //while it's not the end of file
{
System.out.print(data);
}
}while(temp!=-1); //ends the loop if it's the end of file.
}catch(IOException e3){
System.out.println("Problem in reading the file..");
}//end of catch
//WE WILL INSERT THE CODE HERE
} //end of main
}//end of class
Now let us insert the following code as indicated above:
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System.out.println("---------------------------------------");
System.out.println("Now let's try to add a line in the file");
System.out.println("We will use the same file");
FileOutputStream fos = null; //creates object for FileOutputStream
try{
fos = new FileOutputStream(fileName); //connects the object to the file
}catch(FileNotFoundException e4){ //exceptions
System.out.println("File cannot be opened for writing");
}
try{
boolean done = false; //used to text the loop
int data;
do{//do while the line is not a '.'
data=fileRead.read();// read from keyboard
if((char) data =='.')
done=true;
else
fos.write(data); //write to file
}while(!done);
}catch(IOException e5){
System.out.println("Problem in reading from file");
}
*************************************************************
Compile and execute the program. Check on syntax errors.
Note: Make sure you still have the text file you had earlier.
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QUESTION:
What happened to your text file? Check the content of your text file again.
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