DataInputStream類readUnsignedByte()方法 (DataInputStream Class readUnsignedByte() method)

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

  readUnsignedByte()方法在java.io包中可用。

• readUnsignedByte() method is used to read 1 byte (i.e. 8 bit) of data input and returns an unsigned byte value read.

  readUnsignedByte()方法用于讀取1個(gè)字節(jié)(即8位)的數(shù)據(jù)輸入，并返回讀取的無(wú)符號(hào)字節(jié)值。

• readUnsignedByte() 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.

  readUnsignedByte()方法是一個(gè)非靜態(tài)方法，只能通過(guò)類對(duì)象訪問(wèn)，如果嘗試使用類名稱訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• readUnsignedByte() method may throw an exception at the time of reading byte.

  readUnsignedByte()方法在讀取字節(jié)時(shí)可能會(huì)引發(fā)異常。

  • IOException: This exception may throw when this stream is not opened.IOException ：如果未打開(kāi)此流，則可能引發(fā)此異常。
  • EndOfFileException: This exception may throw when this stream has reached its endpoint.EndOfFileException ：當(dāng)此流到達(dá)其端點(diǎn)時(shí)，可能引發(fā)此異常。

Syntax:

句法：

public final int readUnsignedByte();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

Return value:

返回值：

The return type of the method is int, it returns 1 byte of data input, manipulated as an unsigned byte value.

方法的返回類型為int ，它返回1個(gè)字節(jié)的數(shù)據(jù)輸入，并作為無(wú)符號(hào)字節(jié)值進(jìn)行操作。

Example:

例：

// Java program to demonstrate the example // of int readUnsignedByte() method of // DataInputStreamimport java.io.*;public class ReadUnsignedByteOfDIS {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 = {125,111,-121,-112};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);// Loop to write each byte till endfor (byte val: b_arr) {// By using writeByte() method isto// write a byte value to the// DataOutputStream dos_stmdos_stm.writeByte(val);}is_stm = new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");dis_stm = new DataInputStream(is_stm);// Loop To Read Available Data till endwhile (dis_stm.available() > 0) {// By using readUnsignedByte() method isto read // unsigned byte at a time from dis_stmint in = dis_stm.readUnsignedByte();System.out.println("dis_stm.readUnsignedByte(): " + in );}} 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.readUnsignedByte(): 125 dis_stm.readUnsignedByte(): 111 dis_stm.readUnsignedByte(): 135 dis_stm.readUnsignedByte(): 144

翻譯自: https://www.includehelp.com/java/datainputstream-readunsignedbyte-method-with-example.aspx

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