What writes the text “ ” to the end of the file “file.txt”?()
第1题:
A.OutputStreamout=newFileOutputStream(“file.txt”);
B.OutputStreamout=newFileOutputStream(“file.txt”,“append”);
C.FileOutputStreamout=newFileOutputStream(“file.txt”,true);
D.FileOutputStreamout=newFileOutputStream(newfile(“file.txt”));
E.OutputStreamout=newFileOutputStream(newFile(“file.txt”)true);
第2题:
阅读下面写文件的程序 import java. io. *; public class WriteFile{ public static void main(String[]A) { int[]myArray={10,20,30,40}; try{ FileOutputStream f=new FlieOutStream("ints. dat"); DataOutputStream______=new DataOutputStream(f); for(int i=0; i<myArray. length; i ++) dos. writeInt(myArray[i]); dos. close(); System. out. prinfln("Have written binary file ints. dat"); } catch(IOException ioe){ System. out. println("IO Exception"); } } 在程序下画线处填入的正确选项是
A.myArray
B.dos
C.ioe
D.ints
第3题:
A、InputStream in=new FileReader(“file.txt”)
B、InputStream in=new FileInputStream(“file.txt”)
C、InputStream in=new InputStreamFileReader (“file.txt”,“read”)
D、FileInputStream in=new FileReader(new File(“file.txt”))
第4题:
创建一个向文件“file.txt”追加内容的输出流对象的语句有()。
第5题:
在下列程序的空白处,应填入的正确选项是( )。 Import java.io.*; Pulilc class ObjectStreamTest{ Publilc static void main(string args[])throws IOEx- ception{ OhiectOutputStream os=new OhjectOutputStream (new FileOutputStream("serial.bin")); Java.util.Date d=new Java.util.Date; Oos (d); ObjectInputStream is= new OhjectlnputStream(new FileOutputStream("serial. bin")); try{ java.util.date restoredDate= (Java.util.Date)ois.readObject; System.out.println ("read object back from serial.bin file:" +restoredDate); } Catch(ClassNotFoundException cnf){ System.out.println("class not found"); } }
A.WriterObject
B.Writer
C.BufferedWriter
D.writerObject
第6题:
A.OutputStreamout=newFileOutputStream(“file.txt”); Out.writeBytes(“/n”);
B.OutputStreamos=newFileOutputStream(“file.txt”,true); DataOutputStreamout=newDataOutputStream(os);out.writeBytes(“/n”);
C.OutputStreamos=newFileOutputStream(“file.txt”); DataOutputStreamout=newDataOutputStream(os);out.writeBytes(“/n”);
D.OutputStreamos=newOutputStream(“file.txt”,true); DataOutputStreamout=newDataOutputStream(os);out.writeBytes(“/n”);
第7题:
阅读下面写文件的程序 import java.io.*: public class WriteFile{ public static void main(String[] A) { int[] myArray={10,20,30,40}; try { FileOutputStream f=new FileOutputStream("ints.dat"); DataOutputStream ______ =new DataOutputStream(f); for(int i=0;i<myArray.length;i++)dos.writeInt(myArray[i]); dos.close(); System.out.println("Have written binary file ints.dat"); } catch(IOException ioe) { System.out.println("IOException"); } } } 程序中下画线处应填入的正确选项是
A.myArray
B.dos
C.ioe
D.ints
第8题:
要想以读方式打开文件“D:\File.txt”,以下不能实现目的的语句是()。
A、ifstreaminf("D:\\FilEtxt",ios::in);
B、ifstreaminf("D:\\File.txt");
C、ofstreaminf("D:\\File.txt",ios::out);
D、fstreaminf("D:\\File.txt",ios::in|ios::out);
第9题:
( 11 )请在下列程序的空白处,填上适当的内容:
Import java. awt. *;
Import java. util. *;
Class BufferTest{
Public static void main(string args[])
Throws IOException{
FileOutputStream unbuf=
new FileOutputStream( “ test.one ” ) ;
BufferedOutputStream buf=
new 【 11 】 (new FileOutputStream( “ test.two ” ));
System.out.println
( “ write file unbuffered: ” + time(unbuf) + “ ms ” );
System.out.println
( “ write file buffered: ” + time(buf) + “ ms ” );
}
Static int time (OutputStream os)
Throws IOException{
Date then = new Date();
for (int i=0; i<50000; i++){
os.write(1);
}
}
os.close();
return(int)(()new Date()).getTime() - then.getTime());
}
第10题:
Which two construct an OutputSream that appends to the file “file.txt”? ()