How does bufferedwriter work

To answer your question : When you write data, it will be buffered to a certain level until the buffer is full. After that it will be persisted written to the underlying Stream , e. When you call a flush or close , it will empty the buffer, so all bytes that were buffered will be written to the underlying Stream. They also call the flush or close method of that Stream. If an Exception happens in the loop, you will not close the stream, so some data may be lost. I frequently output text to files.

I wonder something: how does BufferedWriter work? Check the jdk's source code youself. If it doesn't write text, do I need to use flush function to write data? Whenever you call write String s , you will call: write str, 0, str. As you see, it will not write directly.

In the end, it will call the write char[] chars, int i, int i1. If an error occurs in the while loop, the file will be closed without writing data. Unless you need to view the output "on-the-fly" Eg view the log any time with the newest update , you should let the be done automatically the increase the performance. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How does BufferedWriter work in java Ask Question.

Asked 8 years, 9 months ago. Active 8 years, 9 months ago. Viewed 8k times. Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Company Questions. Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. If you noticed the program and the output file image, you might see that writer. Below code snippet output will clear your confusion.

BufferedWriter implements AutoCloseable interface , hence we can use try with resource while using BufferedWriter class. If the requested length is at least as large as the buffer, however, then this method will flush the buffer and write the characters directly to the underlying stream. Thus, redundant BufferedWriters will not copy data unnecessarily.

BufferedWriter; import java.