DataInputStream類readBoolean()方法 (DataInputStream Class readBoolean() method)

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

  readBoolean()方法在java.io包中可用。

• readBoolean() method is used to check whether this stream read the boolean value or not.

  readBoolean()方法用于檢查此流是否讀取布爾值。

• readBoolean() 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.

  readBoolean()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。

• readBoolean() method may throw an exception at the time of reading boolean.

  readBoolean()方法在讀取布爾值時可能會引發異常。

  • IOException: This exception may throw when this stream is not opened.IOException ：如果未打開此流，則可能引發此異常。
  • EndOfFileException: This exception may throw when this stream has reached its endpoint.EndOfFileException ：當此流到達其端點時，可能引發此異常。

Syntax:

句法：

public final boolean readBoolean();

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 boolean, it returns true when byte is non-zero otherwise it returns false.

該方法的返回類型為boolean ，當byte為非零時返回true ，否則返回false 。

Example:

例：

// Java program to demonstrate the example // of boolean readBoolean() method of // DataInputStreamimport java.io.*;public class ReadBooleanOfDIS {public static void main(String[] args) throws Exception {InputStream is_stm = null;DataInputStream dis_stm = null;byte[] b_arr = {97,0,99,100,0,101};try {// Instantiate ByteArrayInputStream and // DataInputStreamis_stm = new ByteArrayInputStream(b_arr);dis_stm = new DataInputStream(is_stm);// Loop To Read Available Data till endwhile (dis_stm.available() > 0) {// By using readBoolean() method returns true// if the read byte is non-zero otherwise// it returns falseboolean status = dis_stm.readBoolean();System.out.println("dis_stm.readBoolean(): " + status);}} catch (Exception ex) {System.out.println(ex.toString());} finally {// To free system resorces linked// with these streamsif (is_stm != null)is_stm.close();if (dis_stm != null)dis_stm.close();}} }

Output

輸出量

dis_stm.readBoolean(): true dis_stm.readBoolean(): false dis_stm.readBoolean(): true dis_stm.readBoolean(): true dis_stm.readBoolean(): false dis_stm.readBoolean(): true

翻譯自: https://www.includehelp.com/java/datainputstream-readboolean-method-with-example.aspx

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