READ Free Dumps For Oracle- 1z0-804
| Question ID 21463 | Given the existing destination file, a source file only 1000 bytes long, and the code fragment:
public void process (String source, String destination) {
try (InputStream fis = new FileInputStream(source);
OutputStream fos = new FileOutputStream(destination) ) {
byte [] buff = new byte[2014];
int i;
while ((i = fis.read(buff)) != -1) {
fos.write(buff,0,i); // line ***
}
} catch (IOException e) {
System.out.println(e.getClass());
}
}
What is the result?
|
| Option A | Overrides the content of the destination file with the source file content
|
| Option B | Appends the content of the source file to the destination file after a new line
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| Option C | Appends the content of the source file to the destination file without a break in the flow
|
| Option D | Throws a runtime exception at line***
|
| Correct Answer | A |
Explanation Explanation: The whole of the FileInputStream will be read (see ** below). The content of the FileInputStream will overwrite the destination file (see *** below). *A FileInputStream obtains input bytes from a file in a file system. What files are available depends on the host environment. FileInputStream is meant for reading streams of raw bytes such as image data. For reading streams of characters, consider using FileReader. **FileInputStream.read(byte[] b) Reads up to b.length bytes of data from this input stream into an array of bytes. Parameters: b - the buffer into which the data is read. Returns: the total number of bytes read into the buffer, or -1 if there is no more data because the end of the file has been reached. ***FileOutputStream You can construct a FileOutputStream object by passing a string containing a path name or a File object. You can also specify whether you want to append the output to an existing file. public FileOutputStream (String path) public FileOutputStream (String path, boolean append) public FileOutputStream (File file) public FileOutputStream (File file, boolean append) With the first and third constructors, if a file by the specified name already exists, the file will be overwritten. To append to an existing file, pass true to the second or fourth constructor. Reference:Class FileInputStream Reference:Class FileOutputStream
| Question ID 21464 | Given the code fragment:
public class ReadFile01 {
public static void main(String[] args) {
String fileName = "myfile.txt";
try (BufferedReader buffIn = // Line 4
new BufferedReader(new FileReader(fileName))) {
String line = ""; int count = 1;
line = buffIn.readLine(); // Line 7
do {
line = buffIn.readLine();
System.out.println(count + ": " + line);
} while (line != null);
} catch (IOException | FileNotFoundException e) {
System.out.println("Exception: " + e);
}
}
}
What is the result, if the file myfile.txt does not exist?
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| Option A | A runtime exception is thrown at line 4
|
| Option B | A runtime exception is thrown at line 7
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| Option C | Creates a new file and prints no output
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| Option D | Compilation fails
|
| Correct Answer | D |
Explanation Explanation: !! Compilation fails if FileNotFoundException is tried to catch (Line 12) (The exception FileNotFoundException is already caught by the alternative IOException) ----------------------------------------------------------------------------------------------- if this is removed will be thrown a FileNotFoundException at line 4.