double readDouble protected ObjectStreamClass readClassDescriptor ObjectInputStream 描述 所述java.io.ObjectInputStream.readDouble()方法读取一个64位的两倍。 声明 以下是java.io.ObjectInputStream.readDouble()方法的声明。 public double readDouble() 参数 NA 返回值 此方法返回64位双读。 异常 EOFException - 如果到达文件结尾。 IOException - 如果发生I / O错误。 实例 以下示例显示了java.io.ObjectInputStream.readDouble()方法的用法。 package com.tutorialspoint; import java.io.*; public class ObjectInputStreamDemo { public static void main(String[] args) { double b = 0380549705498d; try { // create a new file with an ObjectOutputStream FileOutputStream out = new FileOutputStream("test.txt"); ObjectOutputStream oout = new ObjectOutputStream(out); // write something in the file oout.writeDouble(b); oout.writeDouble(49753986394864d); oout.flush(); // create an ObjectInputStream for the file we created before ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt")); // read and print a double System.out.println("" + ois.readDouble()); // read and print a double System.out.println("" + ois.readDouble()); } catch (Exception ex) { ex.printStackTrace(); } } } 让我们编译并运行上面的程序,这将产生以下结果 3.80549705498E11 4.9753986394864E13 protected ObjectStreamClass readClassDescriptor ObjectInputStream