java-decorator-pattern

decoratorJavaIo.java

public void main() {
  // FileInputStream - responsible for reading the file
  FileInputStream fileInputStream = new FileInputStream("file.txt");
  
  // BufferedInputStream extends FilterInputStream and not FileInputStream, it is
  // a decorator which enhances the functionality of the original object by wrapping over it.
  BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream);
  // The read operation becomes buffered now
  bufferedInputStream.read();
  
}