例八.txt

这是一本java基础教程 对新手上路有很大帮助

import java.io.*;
public class Example9_8{
    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 ok");
        } 
        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值
             System.out.println(":"+in_data.readBoolean());        //读取第2个boolean值
             char c;
             while((c=in_data.readChar())!='\0')                 //'\0'表示空字符
                System.out.print(c);
        } 
        catch(IOException e){}
    }
}