Java.io.ObjectInputStream.readDouble()方法實例
java.io.ObjectInputStream.readDouble() 方法讀取一個64位double。
聲明
以下是java.io.ObjectInputStream.readDouble()方法的聲明
public double readDouble()
參數
- NA
返回值
此方法返回讀取64位double.
異常
EOFException -- 如果到達文件的末尾。
IOException -- 如果發生I/ O錯誤。
例子
下面的示例演示java.io.ObjectInputStream.readDouble()方法的用法。
package com.yiibai; 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(); } } }
讓我們編譯和運行上面的程序,這將產生以下結果:
3.80549705498E11 4.9753986394864E13