Question

Does constructor new FileInputStream(someFile); invoke close() method after initialization? Need I call close() on this object after it initialization ?

Answer 1

If you forget to do this, the file will ordinarily be closed automatically when the program terminates or when the file stream object is garbage collected, but it’s best to close a file as soon as you are done with it.

File file = new File("DevFile.txt"); // This will create file object with meta info

int ch;
StringBuffer strContent = new StringBuffer("");
FileInputStream fin = null;

try {
fin = new FileInputStream(file); // It'll open a stream and type is input

while ((ch = fin.read()) != -1)// and you can read data stream unless it is closed
strContent.append((char) ch);

fin.close(); // you should close stream to provide safety of your file 

} catch (FileNotFoundException e) {
} catch (IOException ioe) {
}