ObjectInputStream类readLong()方法
- readLong() 方法可在
java.io
包。 - readLong() 方法用于从此 ObjectInputStream 流中读取 8 个字节(即 64 位)的 long 值。
- readLong() 方法是一个非静态方法,它只能通过类对象访问,如果我们尝试使用类名访问方法,那么我们将得到一个错误。
-
readLong() 方法可能会在长时间阅读时抛出异常。
- IOException:在执行时遇到任何输入/输出错误时可能会抛出此异常。
- EOF异常:当此流到达文件末尾时,可能会抛出此异常。
用法:
public long readLong();
参数:
- 它不接受任何参数。
返回值:
该方法的返回类型是long
,它返回读取的 8 字节long值。
例:
// Java program to demonstrate the example
// of long readLong() method of ObjectInputStream
import java.io.*;
public class ReadLongOfOIS {
public static void main(String[] args) throws Exception {
// Instantiates ObjectOutputStream , ObjectInputStream
// FileInputStream and FileOutputStream
FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");
ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);
FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");
ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);
// By using writeLong() method is to write
// long to the obj_out_stm stream
obj_out_stm.writeLong(5411489332534l);
obj_out_stm.writeLong(234773224114l);
obj_out_stm.flush();
while (obj_in_stm.available() > 0) {
// By using readLong() method is to read
// long from the obj_in_stm
long val = (int) obj_in_stm.readLong();
System.out.println("obj_in_stm.readLong():" + val);
}
// By using close() method is to
// close all the streams
file_in_stm.close();
file_out_stm.close();
obj_in_stm.close();
obj_out_stm.close();
}
}
输出
obj_in_stm.readLong():-169460426 obj_in_stm.readLong():-1449977166
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注:本文由纯净天空筛选整理自Preeti Jain大神的英文原创作品 Java ObjectInputStream readLong() Method with Example。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。