DataOutputStream類writeByte()方法 (DataOutputStream Class writeByte() method)

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

  writeByte()方法在java.io包中可用。

• writeByte() method is used to write the given value as one-byte value to the basic stream and the variable counter is plus by 1 on successful execution.

  writeByte()方法用于將給定值作為一字節值寫入基本流，并且成功執行時變量計數器加1。

• writeByte() 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.

  writeByte()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。

• writeByte() method may throw an exception at the time of writing byte.

  writeByte()方法在寫入字節時可能會引發異常。

  IOException: This exception may throw while getting any input/output error.

  IOException ：在獲取任何輸入/輸出錯誤時，可能引發此異常。

Syntax:

句法：

public final void writeByte(int val);

Parameter(s):

參數：

• int val – represents the byte value to be written to the basic data output stream.

  int val –表示要寫入基本數據輸出流的字節值。

Return value:

返回值：

The return type of the method is void, it returns nothing.

該方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example // of void writeByte(int val) method // of DataOutputStreamimport java.io.*;public class WriteByteOfDOS {public static void main(String[] args) throws Exception {ByteArrayOutputStream baos_stm = null;DataOutputStream dos_stm = null;byte[] b_arr = {10,20,30,40,50};try {// Instantiates ByteArrayOutputStream, DataOutputStreambaos_stm = new ByteArrayOutputStream();dos_stm = new DataOutputStream(baos_stm);for (byte val: b_arr) {// By using writeByte() method isto write// byte value from the given byte array// to the dos_stm streamdos_stm.writeByte(val);}// By using flush() method isto// flush output bytes are written out// to the basic output streamdos_stm.flush();// By using toByArray() method isto// convert the stream baos_stm to byte // arraybyte[] by = baos_stm.toByteArray();// Loop to display each byte to the// baos_stm data till its endfor (byte val: by) {// Display byteSystem.out.println("dos_stm.writeByte(): " + val);}} catch (Exception ex) {System.out.println(ex.toString());} finally {// this block is to free all necessary system // resources linked with the streamif (baos_stm != null)baos_stm.close();if (dos_stm != null)dos_stm.close();}} }

Output

輸出量

dos_stm.writeByte(): 10 dos_stm.writeByte(): 20 dos_stm.writeByte(): 30 dos_stm.writeByte(): 40 dos_stm.writeByte(): 50

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

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