testdataoutputstream.java

本书是一本为Java学习者在基础内容学习结束后进行课程设计时提供参考的指导书

package apibook.c3.s6;

import java.io.*;

//测试DataOutputStream类
public class TestDataOutputStream {
  public TestDataOutputStream() {
  }
  public static void main(String[] args) {
    FileOutputStream file_out;
    DataOutputStream data_out;

    try {
      String filename = "TestDataOutputStream.txt";
        file_out = new FileOutputStream(filename);//创建一个文件输出流
        data_out = new DataOutputStream(file_out);//使用该文件输出流创建数据输出流

        char a = 'a';
        byte b = 2;
        String c = "abc";
        short d = 4;
        byte[] b2 = {'a', 'b', 'c'};

        data_out.write(b);//写字节
        data_out.write(b2, 0, b2.length);//写字节数组
        data_out.writeBoolean(true);//写布尔值
        data_out.writeChar(a);//写字符
        data_out.writeBytes(c);//作为字节写入字符串
        data_out.writeChars(c);//作为字符写入字符串
        data_out.writeDouble(123.456);//double
        data_out.writeFloat(123.456f);//float
        data_out.writeInt(678);//int
        data_out.writeLong(678l);//long
        data_out.writeShort(d);//short
        data_out.writeUTF(c);//使用utf编码写入字符串
        data_out.writeUTF("abc\n");
        data_out.write(b);
        data_out.writeShort(d);
        data_out.flush();//刷新流
        System.out.println("Size of file written: " + data_out.size());
        data_out.close();//关闭
    } catch (IOException e) {
        System.out.println(e);
    }
  }

}