DataOutputStream類的size()方法 (DataOutputStream Class size() method)

• size() method is available in java.io package.

  size()方法在java.io包中可用。

• size() method is used to return the size of this stream or in other words, we can say it returns the value of the variable counter that contains written bytes.

  size()方法用于返回此流的大小，換句話說，可以說它返回包含已寫入字節的變量計數器的值。

• size() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  size()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• size() method does not throw an exception at the time of returning size.

  返回size時， size()方法不會引發異常。

Syntax:

句法：

public final int size();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of the method is int, it returns the last value of the variable counter.

方法的返回類型為int ，它返回變量計數器的最后一個值。

Example:

例：

// Java program to demonstrate the example // of int size() method of DataOutputStreamimport java.io.*;public class SizeOfDOS {public static void main(String[] args) throws IOException {InputStream is_stm = null;DataInputStream dis_stm = null;FileOutputStream fos_stm = null;DataOutputStream dos_stm = null;byte[] b_arr = {12,20,45,98,75,69,30,58,47,61,83,55};try {// Instantiate FileInputStream, // DataInputStream, FileOutputStream// and DataOutputStream fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");dos_stm = new DataOutputStream(fos_stm);is_stm = new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");dis_stm = new DataInputStream(is_stm);// Loop to write each byte till endfor (byte val: b_arr) {// By using write() method isto// write a byte value to the// DataOutputStream dos_stmdos_stm.write(val);}// Loop To Read Available Data till endwhile (dis_stm.available() > 0) {// By using read() method isto read // byte from dis_stmint in = dis_stm.read();System.out.println("dis_stm.read(): " + in );}System.out.println();// By using size() method isto return// size of this streamint size = dos_stm.size();System.out.println("dos_stm.size(): " + size);} catch (Exception ex) {System.out.println(ex.toString());} finally {// To free system resources linked// with these streamsif (is_stm != null)is_stm.close();if (dis_stm != null)dis_stm.close();if (dos_stm != null)dos_stm.close();if (fos_stm != null)fos_stm.close();}} }

Output

輸出量

dis_stm.read(): 12 dis_stm.read(): 20 dis_stm.read(): 45 dis_stm.read(): 98 dis_stm.read(): 75 dis_stm.read(): 69 dis_stm.read(): 30 dis_stm.read(): 58 dis_stm.read(): 47 dis_stm.read(): 61 dis_stm.read(): 83 dis_stm.read(): 55dos_stm.size(): 12

翻譯自: https://www.includehelp.com/java/dataoutputstream-size-method-with-example.aspx

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