FileOutputStream Java

FileOutputStream Java

Two most frequently used classes from package used for file copying are FileInputStream and FileOutputStream. FileInputStream java is used to read from a file and FileOutputStream Java is used to write into a file.
Following example uses both FileInputStream and FileOutputStream Java.

FileInputStream fis = new FileInputStream(“abc.txt”);
FileOutputStream fos = new FileOutputStream(“def.txt”);

abc.txt file is opened in read mode by FileInputStream class and def.txt file is opened in write mode by FileOutputStream Java class.

int temp;
while((temp = != -1)

read() method reads byte by byte from the source file abc.txt, converts the byte into its ASCII integer value and returns. For example, A existing in abc.txt file is read and returned as 65. For this reason temp is taken as int data type. read() method comes with another property of returning -1 when EOF comes. That is, file reading ends when read() method returns -1.

The write() method of FileOutputStream Java takes the 65 ASCII integer value, converts back into original character A and writes into the destination file def.txt.


When the job is over, close the streams so that memory is freed.

More explanation is available on the above code at File copying with byte streams

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