IO流_数据输入输出流的概述和讲解

package cn.itcast_01;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/*
 * 可以读写基本数据类型的数据
 * 数据输入流:DataInputStream
 *     DataInputStream(InputStream in)
 * 数据输出流:DataOutputStream
 *     DataOutputStream(OutputStream out) 
 */
public class DataStreamDemo {
  public static void main(String[] args) throws IOException {
    // 写
    // write();
    // 读
    read();

  }

  public static void read() throws IOException {
    // DataInputStream(InputStream in)
    // 创建数据输入流对象
    DataInputStream dis = new DataInputStream(
        new FileInputStream("dos.txt"));

    // 读取数据
    byte b = dis.readByte();
    short s = dis.readShort();
    int i = dis.readInt();
    long l = dis.readLong();

    float f = dis.readFloat();
    double d = dis.readDouble();
    boolean bb = dis.readBoolean();
    char c = dis.readChar();

    // 释放资源
    dis.close();

    System.out.println(b);
    System.out.println(s);
    System.out.println(i);
    System.out.println(l);
    System.out.println(f);
    System.out.println(d);
    System.out.println(bb);
    System.out.println(c);
  }

  public static void write() throws IOException {
    // DataOutputStream(OutputStream out)
    // 创建数据输出流对象
    DataOutputStream dos = new DataOutputStream(new FileOutputStream(
        "dos.txt"));

    // 写数据了
    dos.writeByte(10);
    dos.writeShort(100);
    dos.writeInt(1000);
    dos.writeLong(10000);

    dos.writeFloat(12.5F);
    dos.writeDouble(15.23);
    dos.writeBoolean(true);
    dos.writeChar('a');

    // 释放资源
    dos.close();
  }
}