- لنفترض أنه تتم قراءة البيانات من لوحة المفاتيح إلى الذاكرة باستخدام DataInputStream ويستغرق الأمر ثانية واحدة لقراءة حرف واحد في الذاكرة ويتم كتابة هذا الحرف في الملف بواسطة FileOutputStream عن طريق قضاء ثانية واحدة أخرى.
- لذا فإن قراءة وكتابة ملف سيستغرق 200 ثانية. وهذا يضيع الكثير من الوقت. من ناحية أخرى، إذا تم استخدام التصنيف المخزن مؤقتًا، فإنه يوفر مخزنًا مؤقتًا يتم ملؤه أولاً بأحرف من المخزن المؤقت والتي يمكن كتابتها مرة واحدة في الملف. يجب استخدام الفئات المخزنة مؤقتًا فيما يتعلق بفئات الدفق الأخرى.
- First the DataInputStream reads data from the keyboard by spending 1 sec for each character. This character is written into the buffer. Thus to read 100 characters into a buffer it will take 100 second time. Now FileOutputStream will write the entire buffer in a single step. So reading and writing 100 characters took 101 sec only. In the same way reading classes are used for improving the speed of reading operation. Attaching FileOutputStream to BufferedOutputStream as:
BufferedOutputStream bout=new BufferedOutputStream(fout1024);
Here the buffer size is declared as 1024 bytes. If the buffer size is not specified then a default size of 512 bytes is used - CharacterStream مقابل ByteStream
- فئة الملف في جافا
- معالجة الملفات في Java باستخدام FileWriter وFileReader
DataInputStream dis =new DataInputStream(System.in);Here System.in represent the keyboard which is linked with DataInputStream object
FileOutputStream fout=new FileOutputStream(file.txt);
ch=(char)dis.read(); fout.write(ch);
//Java program to demonstrate creating a text file using FileOutputStream import java.io.BufferedOutputStream; import java.io.DataInputStream; import java.io.FileOutputStream; import java.io.IOException; class Create_File { public static void main(String[] args) throws IOException { //attach keyboard to DataInputStream DataInputStream dis=new DataInputStream(System.in); // attach file to FileOutputStream FileOutputStream fout=new FileOutputStream('file.txt'); //attach FileOutputStream to BufferedOutputStream BufferedOutputStream bout=new BufferedOutputStream(fout1024); System.out.println('Enter text (@ at the end):'); char ch; //read characters from dis into ch. Then write them into bout. //repeat this as long as the read character is not @ while((ch=(char)dis.read())!='@') { bout.write(ch); } //close the file bout.close(); } }
If the Program is executed again the old data of file.txt will be lost and any recent data is only stored in the file. If we don’t want to lose the previous data of the file and just append the new data to the end of already existing data and this can be done by writing true along with file name. FileOutputStream fout=new FileOutputStream(file.txttrue);
تحسين الكفاءة باستخدام BufferedOutputStream
Normally whenever we write data to a file using FileOutputStream as:fout.write(ch);Here the FileOutputStream is invoked to write the characters into the file. Let us estimate the time it takes to read 100 characters from the keyboard and write all of them into a file.
C:> javac Create_File.java C:> java Create_File Enter text (@ at the end): This is a program to create a file @ C:/> type file.txt This is a program to create a fileمقالات ذات صلة: