Java DataInputStream readBoolean（）方法（带示例）

DataInputStream类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()方法用于检查此流是否读取布尔值。
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()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
readBoolean() method may throw an exception at the time of reading boolean.
readBoolean()方法在读取布尔值时可能会引发异常。
- IOException: This exception may throw when this stream is not opened.IOException ：如果未打开此流，则可能引发此异常。
- EndOfFileException: This exception may throw when this stream has reached its endpoint.EndOfFileException ：当此流到达其端点时，可能引发此异常。

Syntax:

句法：

    public final boolean readBoolean();

Parameter(s):

参数：

It does not accept any parameter.
它不接受任何参数。

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.

该方法的返回类型为boolean ，当byte为非零时返回true ，否则返回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

输出量

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