RandomAccessFile類writeDouble()方法
- writeDouble() 方法可在
java.io
包。 - writeDouble() 方法用於首先使用 floatToIntBits() 將浮點值更改為整數值,然後將整數值作為 4 字節寫入文件。
- writeDouble() 方法是一個非靜態方法,它隻能通過類對象訪問,如果我們嘗試使用類名訪問該方法,則會出現錯誤。
- writeDouble() 方法可能在寫入浮點值時拋出異常。
IOException:此異常在執行輸入/輸出操作時可能會拋出異常。
用法:
public final void writeFloat(float val);
參數:
float val
– 表示要寫入的浮點值。
返回值:
這個方法的返回類型是void
,它什麽都不返回。
例:
// Java program to demonstrate the example
// of void writeFloat(float val) method of
// RandomAccessFile
import java.io.*;
class RAFWriteFloat {
public static void main(String[] args) throws Exception {
float fl = 12548.2658 f;
// Instantiate a random access file
// object with file name and permissions
RandomAccessFile ra_f = new RandomAccessFile("e:/includehelp.txt", "rw");
// By using writeFloat() method is to
// write float value to the file
ra_f.writeFloat(fl);
// by using seek() method is to
// set the current file indicator
// from where read/write could
// start i.e. we set here 0 so reading
// will be done from 0 till EOF
ra_f.seek(0);
// By using readFloat() method is to
// read a float from this file
System.out.print("ra_f.readFloat():" + ra_f.readFloat());
// By using close() method isto
// close this stream ran_f
ra_f.close();
}
}
輸出
ra_f.readFloat():12548.266
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注:本文由純淨天空篩選整理自Preeti Jain大神的英文原創作品 Java RandomAccessFile writeFloat() Method with Example。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。