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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()方法用于读取1个字节(即8位)的数据输入,并返回读取的无符号字节值。
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()方法是一个非静态方法,只能通过类对象访问,如果尝试使用类名称访问该方法,则会收到错误消息。
readUnsignedByte() method may throw an exception at the time of reading byte.
readUnsignedByte()方法在读取字节时可能会引发异常。
Syntax:
句法:
public final int readUnsignedByte();
Parameter(s):
参数:
It does not accept any parameter.
它不接受任何参数。
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.
方法的返回类型为int ,它返回1个字节的数据输入,并作为无符号字节值进行操作。
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 end for (byte val: b_arr) { // By using writeByte() method isto // write a byte value to the // DataOutputStream dos_stm dos_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 end while (dis_stm.available() > 0) { // By using readUnsignedByte() method isto read // unsigned byte at a time from dis_stm int 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 streams if (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
输出量
dis_stm.readUnsignedByte(): 125dis_stm.readUnsignedByte(): 111dis_stm.readUnsignedByte(): 135dis_stm.readUnsignedByte(): 144
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