FileInputStream FileOutputStream

FileInputStream is a stream to grab the information from files.Combined with FileOutputStream, we can achieve the function of copying.

Examples:

public class Demo4 {
 
 public static void main(String[] args) {
  String content = null;
  byte[] buffer = new byte[1024];
  int size = 0;
  File file = new File("C:/Users/caich5/Desktop/aaaa.txt");
  InputStream input = null;
  try {
      input = new FileInputStream(file);
      OutputStream output = new FileOutputStream("C:/Users/caich5/Desktop/tttd.txt");
   while((size = input.read(buffer))!= -1){
    //show in console
    content = new String(buffer,0,size);
    System.out.println(content);
    //copy to another file
    output.write(buffer, 0, size);
   }
   input.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}

Tips: FileInputStream,FileOutputStream,both of them are low lever stream.