RandomAccessFile類writeLong()方法 (RandomAccessFile Class writeLong() method)

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

  writeLong()方法在java.io包中可用。

• writeLong() method is used to write the long value to the file as 8 bytes directly without any conversion.

  writeLong()方法用于直接將long值作為8個(gè)字節(jié)寫入文件，而無(wú)需進(jìn)行任何轉(zhuǎn)換。

• writeLong() 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.

  writeLong()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。

• writeLong() method may throw an exception at the time of writing long value.

  writeLong()方法在寫入long值時(shí)可能會(huì)引發(fā)異常。

  IOException: This exception may throw an exception while performing input/output operation.

  IOException ：在執(zhí)行輸入/輸出操作時(shí)，此異常可能會(huì)引發(fā)異常。

Syntax:

句法：

public final void writeLong(long val);

Parameter(s):

參數(shù)：

• long val – represents a long value to write.

  long val –表示要寫入的long值。

Return value:

返回值：

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

此方法的返回類型為void ，不返回任何內(nèi)容。

Example:

例：

// Java program to demonstrate the example // of void writeLong(long val)a method of // RandomAccessFileimport java.io.*;class RAFWriteLong {public static void main(String[] args) throws Exception {long lo = 124587584 l;// Instantiate a random access file// object with file name and permissionsRandomAccessFile ra_f = new RandomAccessFile("e:/includehelp.txt", "rw");// By using writeLong() method is to // write a long value to the filera_f.writeLong(lo);// 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 EOFra_f.seek(0);// By using readLong() method is to // read a long value from this fileSystem.out.print(" ra_f.readLong(): " + ra_f.readLong());// By using close() method isto// close this stream ran_fra_f.close();} }

Output

輸出量

ra_f.readLong(): 124587584

翻譯自: https://www.includehelp.com/java/randomaccessfile-writelong-method-with-example.aspx

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