testdatainputstream.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DataInputStream类
public class TestDataInputStream {
  public TestDataInputStream() {
  }
  public static void main(String[] args) {
    FileInputStream file_in;
    DataInputStream data_in;

    try {
      String filename = "TestDataOutputStream.txt";
        file_in = new FileInputStream(filename);//打开输入文件
        data_in = new DataInputStream(file_in);//建立数据输入流

        System.out.println("Available: " + data_in.available());//察看可用字节数

        byte b;
        byte[] b2 = new byte[1];
        b = data_in.readByte();//读取一个字节
        System.out.println("Byte: " + b);
        data_in.read(b2);//读一个字节数组
        System.out.println("Byte[0]: " + (char)b2[0]);
        data_in.read(b2, 0, b2.length);
        System.out.println("Byte[0]: " + (char)b2[0]);
        int ub = data_in.readUnsignedByte();
        System.out.println("Unsigned Byte: " + b);
        System.out.println("Boolean: " + data_in.readBoolean());//读入布尔值
        char a = data_in.readChar();//读入字符
        System.out.println("Char: " + a);

        byte[] b3 = new byte[3];
        data_in.readFully(b3);//读入字符串
        System.out.println("readFully: " + (char)b3[0] + (char)b3[1] +
                           (char)b3[2]);
        data_in.skipBytes(6); //跳过字符'abc'
        double d1 = data_in.readDouble();//读入double
        float f1 = data_in.readFloat();//读入float
        int i = data_in.readInt();//读入int
        long l = data_in.readLong();//读入long
        short s = data_in.readShort();//读入short
        String str = data_in.readUTF();
        ub = data_in.readUnsignedByte();
        int us = data_in.readUnsignedShort();
        System.out.println("UTF String" + str);
    } catch (IOException e) {
        System.out.println(e);
    }
  }

}