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Core Java perguntas e respostas de entrevista

Question: What is FileOutputStream in java?

Answer:

Java.io.FileOutputStream is an output stream for writing data to a File or to a FileDescriptor. Following are the important points about FileOutputStream:

This class is meant for writing streams of raw bytes such as image data.
For writing streams of characters, use FileWriter

public class FileOutputStream extends OutputStream

Constructors:

1	FileOutputStream(File file) This creates a file output stream to write to the file represented by the specified File object.
2	FileOutputStream(File file, boolean append) This creates a file output stream to write to the file represented by the specified File object.
3	FileOutputStream(FileDescriptor fdObj) This 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.
4	FileOutputStream(String name) This creates an output file stream to write to the file with the specified name.
5	FileOutputStream(String name, boolean append) This creates an output file stream to write to the file with the specified name.

Example:

file = new File("c:/newfile.txt");
fop = new FileOutputStream(file);
if (!file.exists()) {
	file.createNewFile();
} 
// get the content in bytes
byte[] contentInBytes = content.getBytes(); 
fop.write(contentInBytes);
fop.flush();
fop.close();

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