Oracle 1Z0-805題庫介紹

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Oracle 1Z0-805 考試概覽:

Oracle 1Z0-805 考試大綱主題:

1Z0-805 考試必讀：考生最常問的幾個問題

最新的 OCP 1Z0-805 免費考試真題：

問題 #1

Which two statements are true regarding the try with resources statement?

A. In a try with resources statement, any catch or finally block is run after the resources have been closed.
B. The close methods of resources are called in the reverse order of their creation.
C. All the resources must implement the java.io.closeable interface.
D. The resources declared in a try with resources statement are not closed automatically if an exception occurs inside the try block.

問題 #2

Given the following incorrect program:
class MyTask extends RecursiveTask<Integer> {
final int low;
final int high;
static final int THRESHOLD = /* . . . */
MyTask (int low, int high) { this.low = low; this.high = high; }
Integer computeDirectly()/* . . . */
protected void compute() {
if (high - low <= THRESHOLD)
return computeDirectly();
int mid = (low + high) / 2;
invokeAll(new MyTask(low, mid), new MyTask(mid, high));
Which two changes make the program work correctly?

A. The computeDirectly () method must be enhanced to fork () newly created tasks.
B. Results must be retrieved from the newly created MyTask Instances and combined.
C. The MyTask class must be modified to extend RecursiveAction instead of RecursiveTask.
D. The midpoint computation must be altered so that it splits the workload in an optimal manner.
E. The THRESHOLD value must be increased so that the overhead of task creation does not dominate the cost of computation.
F. The compute () method must be changed to return an Integer result.

問題 #3

The current working directory is named finance.
Which two code fragments allow you to write the salary.dat file if it does not exist under "finance\payroll"?

A. public static void setFileContent (String[] s) throws IOException {
File file= new file ("payroll\\salary.dat").getCanonicalFile();
try (BufferWriter br = new BufferWriter (new FileWriter(File))) {
br.write ("experience new features of java");
}
}
B. public static void setFileContent (String[] s) throws IOException {
path p=paths.get ("payroll\\salary.dat");
File file=p.toAbsolutePath(LinkOption.NOFOLLOW_LINKS).toFile();
try (BufferWriter br = new BufferWriter (new FileWriter(File))) {
br.write ("experience new features of java");
}
}
C. public static void setFileContent (String[] s) throws IOException {
path p=paths.get("payroll\\salary.dat");
File file=p.toAbsolutePath().toFile();
try (BufferWriter br = new BufferWriter (new FileWriter(File))) {
br.write ("experience new features of java");
}
}
D. public static void setFileContent (String[] s) throws IOException {
File file=new File ("payroll\\salary.dat").getAbsolutePath();
try (BufferWriter br = new BufferWriter (new FileWriter(File))) {
br.write ("experience new features of java");
}
}
E. public static void setFileContent (String[] s) throws IOException {
File file= new File ("payroll\\salary.dat").getCanonicalFile();
try (BufferWriter br = new BufferWriter (new FileWriter(File))) {
br.write ("experience new features of java");
}
}

問題 #4

Given the code fragment:
public static void main(String[] args) {
Path file = Paths.get("D:\\company\\report.txt");
try (SeekableByteChannel sbc = Files.newByteChannel(file,new OpenOption[]
sbc.position(5);
sbc.truncate(30);
} catch (IOException e) {
System.err.printin("Caught IOException: " + e.getMessage () } ;
}
}
What is the result if the report.txt file contains
Welcome to the world of Java?

A. The contents of the file remain unchanged.
B. The file contains the first five characters.
C. A NonWritableChannelException is thrown at runtime.
D. The file contains the first four characters.

問題 #5

Which two statements are true about RowSet subinterfaces?

A. A FilteredRowSet object filter can be modified at any time.
B. A webRowSet returns JSON-formatted data.
C. A cachedRowSet provides a connected view of the database.
D. A jdbcRowSet object provides a JavaBean view of a result set.

問題與答案：