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单选题
The file “file.txt” exists on the file system and contsins ASCII text. Given： try { File f = new File（“file.txt”）； OutputStream out = new FileOutputStream（f， true）； } catch （IOException） {} What is the result？（）
A
The code does not compile.
B
The code runs and no change is made to the file.
C
The code runs and sets the length of the file to 0.
D
An exception is thrown because the file is not closed.
E
The code runs and deletes the file from the file system.
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更多 “单选题The file “file.txt” exists on the file system and contsins ASCII text. Given： try { File f = new File（“file.txt”）； OutputStream out = new FileOutputStream（f， true）； } catch （IOException） {} What is the result？（）A The code does not compile.B The code runs and no change is made to the file.C The code runs and sets the length of the file to 0.D An exception is thrown because the file is not closed.E The code runs and deletes the file from the file system.” 相关考题
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WhichtwoconstructanOutputSreamthatappendstothefile“file.txt”?()
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Whatwritesthetext“”totheendofthefile“file.txt”?()
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Thefilefile.txt”existsonthefilesystemandcontsinsASCIItext.Given:try{Filef=newFile(file.txt”);OutputStreamout=newFileOutputStream(f,true);}catch(IOException){}Whatistheresult?()
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创建一个向文件“file.txt”追加内容的输出流对象的语句有（）。A、FileOutputStream out=new FileOutputStream（“file.txt”，true）；B、OutputStream out=new FileOutputStream（“file.txt”，“append”）；C、OutputStream out=new FileOutputStream（“file.txt”）；D、FileOutputStream out=new FileOutputStream（new file（“file.txt”））；E、OutputStream out=new FileOutputStream（new File（“file.txt”），true.；
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Which two construct an OutputSream that appends to the file “file.txt”？ （）A、 OutputStream out=new FileOutputStream（“file.txt”）；B、 OutputStream out=new FileOutputStream（“file.txt”， “append”）；C、 FileOutputStream out=new FileOutputStream（“file.txt”， true）；D、 FileOutputStream out=new FileOutputStream（new file（“file.txt”））；E、 OutputStream out=new FileOutputStream（new File（“file.txt”）true）；
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Which of the following will occur if an operator types the command vi file.out?（）A、If the file exists it will be opened for editing. If the file does not exist an error message will be displayed.B、If the file exists it will be opened for editing. If the file does not exist a new file with the name file.out will be created and opened for editing.C、If the file exists an error message will be displayed. If the file does not exist a new file with the name file.out will be created and opened for editing.D、If the file exists the operator will be asked whether to open the file or overwrite the file. If the file does not exist a new file with the name file.out will be created and opened for editing.
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Which two create an InputStream and open file the “file.txt” for reading？ （）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”））；E、 FileInputStream in=new FileInputStream（new File（“file.txt”））；
考题
Which determines if “prefs” is a directory and exists on the file system？（） A、 Boolean exists=Directory.exists （“prefs”）；B、 Boolean exists=（new File（“prefs”））.isDir（）；C、 Boolean exists=（new Directory（“prefs”））.exists（）；D、 Boolean exists=（new File（“prefs”））.isDirectory（）；E、 Boolean exists=true； Try{ Directory d = new Directory（“prefs”）； } catch （FileNotFoundException e） { exists = false； }
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Which gets the name of the parent directory file “file.txt”？（）A、 String name= File.getParentName（“file.txt”）；B、 String name= （new File（“file.txt”））.getParent（）；C、 String name = （new File（“file.txt”））.getParentName（）；D、 String name= （new File（“file.txt”））.getParentFile（）；E、 Directory dir=（new File （“file.txt”））.getParentDir（）； String name= dir.getName（）；
考题
The file “file.txt” exists on the file system and contsins ASCII text. Given： try { File f = new File（“file.txt”）； OutputStream out = new FileOutputStream（f， true）； } catch （IOException） {} What is the result？（）A、 The code does not compile.B、 The code runs and no change is made to the file.C、 The code runs and sets the length of the file to 0.D、 An exception is thrown because the file is not closed.E、 The code runs and deletes the file from the file system.
考题
10. class MakeFile { 11. public static void main（String[] args） { 12. try { 13. File directory = new File（”d”）； 14. File file = new File（directory，”f”）； 15. if（!file.exists（）） { 16. file.createNewFile（）； 17. } 18. } catch （IOException e） { 19. e.printStackTrace 20. } 21. } 22. } The current directory does NOT contain a directory named “d.” Which three are true？（）A、 Line 16 is never executed.B、 An exception is thrown at runtime.C、 Line 13 creates a File object named “d”.D、 Line 14 creates a File object named “f‟.E、 Line 13 creates a directory named “d” in the file system.F、 Line 16 creates a directory named “d” and a file “f” within it in the file system.G、 Line 14 creates a file named "f " inside of the directory named “d” in the file system.
考题
What writes the text “ ” to the end of the file “file.txt”？（）A、 OutputStream out= new FileOutputStream （“file.txt”）； Out.writeBytes （“ /n”）；B、 OutputStream os= new FileOutputStream （“file.txt”， true）； DataOutputStream out = new DataOutputStream（os）； out.writeBytes （“ /n”）；C、 OutputStream os= new FileOutputStream （“file.txt”）； DataOutputStream out = new DataOutputStream（os）； out.writeBytes （“ /n”）；D、 OutputStream os= new OutputStream （“file.txt”， true）； DataOutputStream out = new DataOutputStream（os）； out.writeBytes （“ /n”）；
考题
单选题Which of the following will occur if an operator types the command vi file.out?（）A
If the file exists it will be opened for editing. If the file does not exist an error message will be displayed.B
If the file exists it will be opened for editing. If the file does not exist a new file with the name file.out will be created and opened for editing.C
If the file exists an error message will be displayed. If the file does not exist a new file with the name file.out will be created and opened for editing.D
If the file exists the operator will be asked whether to open the file or overwrite the file. If the file does not exist a new file with the name file.out will be created and opened for editing.
考题
单选题Which method implementations will write the given string to a file named "file"， using UTF8 encoding？（） IMPLEMENTATION a： public void write（String msg） throws IOException { FileWriter fw = new FileWriter（new File（"file"））； fw.write（msg）； fw.close（）； } IMPLEMENTATION b： public void write（String msg） throws IOException { OutputStreamWriter osw = new OutputStreamWriter（new FileOutputStream（"file"）， "UTF8"）； osw.write（msg）； osw.close（）； } IMPLEMENTATION c： public void write（String msg） throws IOException { FileWriter fw = new FileWriter（new File（"file"））； fw.setEncoding（"UTF8"）； fw.write（msg）； fw.close（）； } IMPLEMENTATION d： public void write（String msg） throws IOException { FilterWriter fw = FilterWriter（new FileWriter（"file"）， "UTF8"）； fw.write（msg）； fw.close（）； } IMPLEMENTATION e： public void write（String msg） throws IOException { OutputStreamWriter osw = new OutputStreamWriter（ new OutputStream（new File（"file"））， "UTF8" ）； osw.write（msg）； osw.close（）； }A
Implementation a.B
Implementation b.C
Implementation c.D
Implementation d.E
Implementation e.
考题
多选题10. class MakeFile { 11. public static void main（String[] args） { 12. try { 13. File directory = new File（”d”）； 14. File file = new File（directory，”f”）； 15. if（!file.exists（）） { 16. file.createNewFile（）； 17. } 18. } catch （IOException e） { 19. e.printStackTrace 20. } 21. } 22. } The current directory does NOT contain a directory named “d.” Which three are true？（）ALine 16 is never executed.BAn exception is thrown at runtime.CLine 13 creates a File object named “d”.DLine 14 creates a File object named “f‟.ELine 13 creates a directory named “d” in the file system.FLine 16 creates a directory named “d” and a file “f” within it in the file system.GLine 14 creates a file named f inside of the directory named “d” in the file system.
考题
单选题Which determines if “prefs” is a directory and exists on the file system？（）A
Boolean exists=Directory.exists （“prefs”）；B
Boolean exists=（new File（“prefs”））.isDir（）；C
Boolean exists=（new Directory（“prefs”））.exists（）；D
Boolean exists=（new File（“prefs”））.isDirectory（）；E
Boolean exists=true； Try{ Directory d = new Directory（“prefs”）； } catch （FileNotFoundException e） { exists = false； }
考题
单选题What writes the text “ ” to the end of the file “file.txt”？（）A
OutputStream out= new FileOutputStream （“file.txt”）； Out.writeBytes （“ /n”）；B
OutputStream os= new FileOutputStream （“file.txt”， true）； DataOutputStream out = new DataOutputStream（os）； out.writeBytes （“ /n”）；C
OutputStream os= new FileOutputStream （“file.txt”）； DataOutputStream out = new DataOutputStream（os）； out.writeBytes （“ /n”）；D
OutputStream os= new OutputStream （“file.txt”， true）； DataOutputStream out = new DataOutputStream（os）； out.writeBytes （“ /n”）；
考题
多选题创建一个向文件“file.txt”追加内容的输出流对象的语句有（）。AFileOutputStream out=new FileOutputStream（“file.txt”，true）；BOutputStream out=new FileOutputStream（“file.txt”，“append”）；COutputStream out=new FileOutputStream（“file.txt”）；DFileOutputStream out=new FileOutputStream（new file（“file.txt”））；EOutputStream out=new FileOutputStream（new File（“file.txt”），true.；
考题
单选题Which gets the name of the parent directory file “file.txt”？（）A
String name= File.getParentName（“file.txt”）；B
String name= （new File（“file.txt”））.getParent（）；C
String name = （new File（“file.txt”））.getParentName（）；D
String name= （new File（“file.txt”））.getParentFile（）；E
Directory dir=（new File （“file.txt”））.getParentDir（）； String name= dir.getName（）；
考题
单选题Which statements are true， given the code new FileOutputStream（"data"， true） for creating an object of class FileOutputStream？（）A
FileOutputStream has no constructors matching the given arguments.B
An IOExeception will be thrown if a file named data already exists.C
An IOExeception will be thrown if a file named data does not already exist.D
If a file named data exists， its contents will be reset and overwritten.E
If a file named data exists， output will be appended to its current contents.
考题
多选题Which two construct an OutputSream that appends to the file “file.txt”？ （）AOutputStream out=new FileOutputStream（“file.txt”）；BOutputStream out=new FileOutputStream（“file.txt”， “append”）；CFileOutputStream out=new FileOutputStream（“file.txt”， true）；DFileOutputStream out=new FileOutputStream（new file（“file.txt”））；EOutputStream out=new FileOutputStream（new File（“file.txt”）true）；
考题
单选题The file “file.txt” exists on the file system and contsins ASCII text. Given： try { File f = new File（“file.txt”）； OutputStream out = new FileOutputStream（f， true）； } catch （IOException） {} What is the result？（）A
The code does not compile.B
The code runs and no change is made to the file.C
The code runs and sets the length of the file to 0.D
An exception is thrown because the file is not closed.E
The code runs and deletes the file from the file system.
考题
多选题为文件c：/java/example/file.txt建立File对象file1可以采用（）语句序列。AFile file 1=new File（“c：//java//example//file.txt”）BString path=”c：/java/example/”Filefile1=newFile（path，”oldfile.txt”）CFile dir 1=new File（“c：//java//example”）Filefile1=newFile（dir1，”oldfile.txt”）DFile file 1=new File（“c：/java//example/file.txt”）
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