SCJP Questions And Answers

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QUESTION NO: 81
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;
}

Answer: D

QUESTION NO: 82
Which two create an InputStream and open file the "file.txt" for reading? (Choose Two)
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"));

Answer: B, E

QUESTION NO 83
Which two construct an OutputSream that appends to the file "file.txt"? (Choose Two)
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);

Answer: C, E