RandomAccessFile類readInt()方法 (RandomAccessFile Class readInt() method)

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

  readInt()方法在java.io包中可用。

• readInt() method is used to read signed 32-bit integer value from this RandomAccessFile.

  readInt()方法用于從此RandomAccessFile讀取帶符號的32位整數(shù)值。

• readInt() 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.

  readInt()方法是一個非靜態(tài)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。

• readInt() method may throw an exception at the time of reading integer.

  readInt()方法在讀取整數(shù)時可能會引發(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，此異常可能會引發(fā)異常。
  • EOFException: This exception may throw when the file pointer reaches EOF (End-Of-File) before reading 4 bytes.EOFException ：當(dāng)文件指針在讀取4個字節(jié)之前到達(dá)EOF(文件末尾)時，可能引發(fā)此異常。

Syntax:

句法：

public final int readInt();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

Return value:

返回值：

The return type of this method is int, it returns the 4 bytes of data from this RandomAccessFile manipulated as an int value.

此方法的返回類型為int ，它從作為Random值操縱的RandomAccessFile中返回4個字節(jié)的數(shù)據(jù)。

Example:

例：

// Java program to demonstrate the example // of int readInt() method of // RandomAccessFileimport java.io.*;class RAFReadInt {public static void main(String[] args) throws Exception {// Instantiate a random access file// object with file name and permissionsRandomAccessFile ra_f = new RandomAccessFile("e:/includehelp.txt", "rw");// By using writeFloat() method is to // write float to the filera_f.writeInt(500);// Initially set the file pointer// is at 1 for reading the filera_f.seek(1);// By using readInt() method is to // read int upto signed 4 bytes // from the fileint i = ra_f.readInt();System.out.println("ra_f.readInt(): " + i);// By using close() method isto// close this stream ran_fra_f.close();} }

Output

輸出量

ra_f.readInt(): 128210

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

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