[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fRFnzJjai5MlbBhLWbvrGGnD7zgvuigBFPIRiNy-6qcU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-09 10:59:01",256992964,[8,9,10,11],"编译出错","在D盘创建文件demo.txt,但文件内容是空的","在D盘创建文件demo.txt,并写入数据abc","在D盘已有的文件demo.txt中追加写入abc",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},16,"81220dd3e4cd363aa0f91dea39084f21","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F91c9a3ea300f8cc05b4aa8045bd4a493.png","Java高级程序设计","work_47211473","第9章 IO流作业","请阅读下面的程序 public class Hello { public static void main(String[] args) throws IOException { FileOutputStream fos = new FileOutputStream("D:\\\\demo.txt"); fos.write("abc"); fos.close(); }} 下列针对以上程序运行结果的描述,正确的是( )",[21,32,41,50,59,68,74,77,86,94],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],256992958,[25,26,27,28],"每次读入的字节数不同","前者带有缓存,后者没有","前者以字节为单位读写,后者以字符为单位读写","两者没有区别","字节流和字符流的区别是( )","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],256992959,[36,37,38,39],"Writer","Reader","OutputStream","InputStream","下列哪项是用于输出的字符流? ( )",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],256992960,[45,46,47,48],"getPath()","getName()","isFile()","isAbsolute()","从键盘上输入一个字符串创建文件对象, 若要判断该文件对象为文件,可使用下列哪个方法?( )",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],256992961,[54,55,56,57],"0","1","-1","无标记","用 read()方法读取文件内容时,判断文件结束的标记为( )",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],256992962,[63,64,65,66],"使用字节缓冲流可以提高读取和写入操作的效率","使用字节缓冲流读写文件时,可以一次性读取多个字节的数据","使用字节缓冲流可以减少对磁盘IO的频繁访问","字节缓冲流只能用于处理文本数据","下列关于字节流缓冲区的说法,错误的是( )",{"answer":69,"createTime":5,"id":70,"options":71,"question":73,"source":30,"type":31},[],256992963,[54,56,55,72],"null","下列选项中,FileWriter类中read()方法读取到流末尾的返回值是( )",{"answer":75,"createTime":5,"id":6,"options":76,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],256992965,[81,82,83,84],"我是程序员我爱代码","我爱代码","我是程序员","乱码","请阅读下面的程序 public class Demo { public static void main(String[] args) throws Exception { FileOutputStream fos = new FileOutputStream("aa.txt",true); fos.write("我爱代码".getBytes()); fos.close(); }} 假设项目根目录下有aa.txt,文本内容为"我是程序员",请问执行上面程序执行后aa.txt里面的内容是( )",{"answer":87,"createTime":5,"id":88,"options":89,"question":92,"source":30,"type":93},[],256992966,[90,91],"正确","错误","FileOutputStream类会检查文件是否存在,如果文件不存在则抛出异常",3,{"answer":95,"createTime":5,"id":96,"options":97,"question":98,"source":30,"type":93},[],256992967,[90,91],"如果一个File对象对应的目录下有文件或子目录,调用该对象的delete()方法可以将该目录删除"]