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
// DataInputStream
import 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
// DataInputStream
is_stm = new ByteArrayInputStream(b_arr);
dis_stm = new DataInputStream(is_stm);
// Loop To Read Available Data till end
while (dis_stm.available() > 0) {
// By using readBoolean() method returns true
// if the read byte is non-zero otherwise
// it returns false
boolean 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 streams
if (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