ObjectOutputStream类writeFloat()方法 (ObjectOutputStream Class writeFloat() method)

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

  在java.io包中提供了writeFloat()方法 。

• writeFloat() method is used to write the given 4 bytes of a float value.

  writeFloat()方法用于写入给定的4个字节的浮点值。

• writeFloat() 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.

  writeFloat()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。

• writeFloat() method may throw an exception at the time of writing float.

  writeFloat()方法在编写float时可能会引发异常。

  IOException: This exception may throw when getting any input/output error while writing to the output stream.

  IOException ：在写入输出流时遇到任何输入/输出错误时，可能引发此异常。

Syntax:

句法：

    public void writeFloat(float value);

Parameter(s):

参数：

• float value – represents the float value to be written.

  浮点值 –表示要写入的浮点值。

Return value:

返回值：

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

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example
// of void writeFloat(float value) method of
// ObjectOutputStream
import java.io.*;
public class WriteFloatOfOOS {public static void main(String[] args) throws Exception {// Instantiates ObjectOutputStream , ObjectInputStream
// FileInputStream and FileOutputStream
FileOutputStream 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 the float to the stream
obj_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();
// By using readFloat() method is to
// read the float
for (int i = 0; i < 4; ++i) {float f = obj_in_stm.readFloat();
System.out.println("obj_in_stm.readFloat(): " + f);
}
// By using close() method is to
// close all the streams
System.out.println("Stream Shutdown...");
file_in_stm.close();
file_out_stm.close();
obj_in_stm.close();
obj_out_stm.close();
}
}

Output

输出量

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

翻译自: https://www.includehelp.com/java/objectoutputstream-writefloat-method-with-example.aspx