ObjectInputStream類readFloat()方法 (ObjectInputStream Class readFloat() method)

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

  readFloat()方法在java.io包中可用。

• readFloat() method is used to read 4 bytes (i.e. 32 bit) of float value from this ObjectInputStream stream.

  readFloat()方法用于從此ObjectInputStream流中讀取4個字節(即32位)的float值。

• readFloat() 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.

  readFloat()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。

• readFloat() method may throw an exception at the time of reading float.

  readFloat()方法在讀取float時可能會引發異常。

  • IOException: This exception may throw when getting any input/output error while performing.IOException ：在執行過程中遇到任何輸入/輸出錯誤時，可能引發此異常。
  • EOFException: This exception may throw when this stream has reached its end of the file.EOFException ：當此流到達文件末尾時，可能引發此異常。

Syntax:

句法：

public float readFloat();

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 float, it returns the 4 bytes float value read.

該方法的返回類型為float ，它返回讀取的4個字節的float值。

Example:

例：

// Java program to demonstrate the example // of float readFloat() method of ObjectInputStreamimport java.io.*;public class ReadFloatOfOIS {public static void main(String[] args) throws Exception {// Instantiates ObjectOutputStream , ObjectInputStream // FileInputStream and FileOutputStreamFileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);// By using writeFloat() method is to write// float to the obj_out_stm streamobj_out_stm.writeFloat(10.0f);obj_out_stm.writeFloat(20.0f);obj_out_stm.writeFloat(30.0f);obj_out_stm.writeFloat(40.0f);obj_out_stm.flush();while (obj_in_stm.available() > 0) {// By using readFloat() method is to read// double from the obj_in_stmfloat val = (float) obj_in_stm.readFloat();System.out.println("obj_in_stm.readFloat(): " + val);}// By using close() method is to // close all the streams file_in_stm.close();file_out_stm.close();obj_in_stm.close();obj_out_stm.close();} }

Output

輸出量

obj_in_stm.readFloat(): 10.0 obj_in_stm.readFloat(): 20.0 obj_in_stm.readFloat(): 30.0 obj_in_stm.readFloat(): 40.0

翻譯自: https://www.includehelp.com/java/objectinputstream-readfloat-method-with-example.aspx

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