datainputoutputstream.java

java练习程序

//下面的应用程序，把几个Java类型的数据写到一个文件，再读出来。
import java.io.*;
public class DataInputOutPutStream
{
	public static void main(String args[])
	{
		try
		{
			FileOutputStream fos=new FileOutputStream("jerry.dat");
			DataOutputStream out_data=new DataOutputStream(fos);
			out_data.writeInt(100);
			out_data.writeInt(10012);
			out_data.writeLong(123456);
			out_data.writeFloat(3.1415926f);
			out_data.writeFloat(2.789f);
			out_data.writeDouble(987654321.1234);
			out_data.writeBoolean(true);
			out_data.writeBoolean(false);
			out_data.writeChars("i am ookk");
		}
		catch(IOException e){}
		try
		{
			FileInputStream fis=new FileInputStream("jerry.dat");
			DataInputStream in_data=new DataInputStream(fis);
			System.out .println(": "+in_data.readInt()); //读取第1个int整数
			System.out.println(": "+in_data.readInt());//读取第2个int整数
			System.out.println(":"+in_data.readLong());  //读取第long整数
			System.out.println(": "+in_data.readFloat());//读取第1个float数
			System.out .println(": "+in_data.readFloat());//读取第2个float数
			System.out .println(": "+in_data.readDouble());
			System.out.println(": "+in_data.readBoolean());//读取第1个boolean
			System.out.println(": "+in_data.readBoolean());//读取第2个boolean
			char c;
			while((c=in_data.readChar())!='\0')     //'\0'表示没有空字符
			{
				System.out.print("    "+c+" .");
			}
		}
		catch(IOException e)
		{
		}
	}
}