double readDouble char readChar float readFloat 描述 所述java.io.DataInputStream.readDouble()方法读取8个字节,并返回一个双值。 声明 以下是java.io.DataInputStream.readDouble()方法的声明 public final double readDouble() 参数 NA 返回值 此方法返回8个字节的输入流,解释为double。 异常 IOException - 如果发生I / O错误或流已关闭。 EOFException - 如果流到达结尾。 实例 以下示例显示了java.io.DataInputStream.readDouble()方法的用法。 package com.tutorialspoint; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public class DataInputStreamDemo { public static void main(String[] args) throws IOException { InputStream is = null; DataInputStream dis = null; FileOutputStream fos = null; DataOutputStream dos = null; double[] dbuf = {65.56,66.89,67.98,68.82,69.55,70.37}; try { // create file output stream fos = new FileOutputStream("c:\\test.txt"); // create data output stream dos = new DataOutputStream(fos); // for each byte in the buffer for (double d:dbuf) { // write double to the data output stream dos.writeDouble(d); } // force bytes to the underlying stream dos.flush(); // create file input stream is = new FileInputStream("c:\\test.txt"); // create new data input stream dis = new DataInputStream(is); // read till end of the stream while(dis.available()>0) { // read character double c = dis.readDouble(); // print System.out.print(c + " "); } } catch(Exception e) { // if any I/O error occurs e.printStackTrace(); } finally { // releases all system resources from the streams if(is!=null) is.close(); if(dos!=null) is.close(); if(dis!=null) dis.close(); if(fos!=null) fos.close(); } } } 让我们编译并运行上面的程序,这将产生以下结果 65.56 66.89 67.98 68.82 69.55 70.37 char readChar float readFloat