1z0-830 Oracle Exam Questions and Free Practice Test

Question 13

Which of the followingisn'ta correct way to write a string to a file?

A. javaPath path = Paths.get("file.txt"); byte[] strBytes = "Hello".getBytes(); Files.write(path, strBytes);

B. javatry (BufferedWriter writer = new BufferedWriter("file.txt")) { writer.write("Hello");}

C. javatry (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes();outputStream.write(strBytes);}

D. javatry (PrintWriter printWriter = new PrintWriter("file.txt")) { printWriter.printf("Hello %s", "James");}

E. None of the suggestions

F. javatry (FileWriter writer = new FileWriter("file.txt")) { writer.write("Hello");}

Correct Answer:B

Question 14

Which of the following isn't a valid option of the jdeps command?

A. --check-deps

B. --generate-open-module

C. --list-deps

D. --generate-module-info

E. --print-module-deps

F. --list-reduced-deps

Correct Answer:A

Question 15

Given: java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE); var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A. format4

B. format2

C. format3

D. format1

Correct Answer:B

Question 16

A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

A. bashCopyEditjavac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop

B. css CopyEditjavac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop

C. css CopyEditjavac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop

D. css CopyEditjavac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop

Correct Answer:B

Question 17

What is the output of the following snippet? (Assume the file exists) java
Path path = Paths.get("C:\home\joe\foo"); System.out.println(path.getName(0));

A. C:

B. IllegalArgumentException

C. C

D. Compilation error

E. home

Correct Answer:E

Question 18

Given: java
try (FileOutputStream fos = new FileOutputStream("t.tmp"); ObjectOutputStream oos = new ObjectOutputStream(fos)) { fos.write("Today");
fos.writeObject("Today"); oos.write("Today"); oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A. fos.write("Today");

B. fos.writeObject("Today");

C. oos.write("Today");

D. oos.writeObject("Today");

Correct Answer:D

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