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Home Oracle 1z0-803

Oracle 1z0-803 Exam Practice Questions (P. 3)

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Question #11
Given:

Which two actions, used independently, will permit this class to compile?
  1. A
    Adding throws IOException to the main() method signature
  2. B
    Adding throws IOException to the doSoomething() method signature
  3. C
    Adding throws IOException to the main() method signature and to the dosomething() method
  4. D
    Adding throws IOException to the dosomething() method signature and changing the catch argument to IOException
  5. E
    Adding throws IOException to the main() method signature and changing the catch argument to IOException

Correct Answer:
CD

Question #12
Given:

What is the result?
  1. A
    Hello
  2. B
    Default
  3. C
    Compilation fails
  4. D
    The program prints nothing
  5. E
    An exception is thrown at run time

Correct Answer:
A
The program compiles fine.
The program runs fine.
The output is: hello

Question #13
Given:

Which statement, when inserted into line 5, is valid change?
  1. A
    asc = sc;
  2. B
    sc = asc;
  3. C
    asc = (object) sc;
  4. D
    asc = sc.clone ()

Correct Answer:
B
Works fine.
Incorrect answers:
asc = sc.clone();
Incompatible types.
asc =sc;
Incompatible types.
asc = (object) sc;
Syntax error

Question #14
Given the code fragment:
System.out.printIn("Result: " + 2 + 3 + 5);
System.out.printIn("Result: " + 2 + 3 * 5);
What is the result?
  1. A
    Result: 10 Result: 30
  2. B
    Result: 10 Result: 25
  3. C
    Result: 235 Result: 215
  4. D
    Result: 215 Result: 215
  5. E
    Compilation fails

Correct Answer:
C
First line:
System.out.println("Result: " + 2 + 3 + 5);
String concatenation is produced.
Second line:
System.out.println("Result: " + 2 + 3 * 5);
3*5 is calculated to 15 and is appended to string 2. Result 215.
The output is:

Result: 235 -

Result: 215 -
Note #1:
To produce an arithmetic result, the following code would have to be used:
System.out.println("Result: " + (2 + 3 + 5));
System.out.println("Result: " + (2 + 1 * 5));
run:

Result: 10 -

Result: 7 -
Note #2:
If the code was as follows:
System.out.println("Result: " + 2 + 3 + 5");
System.out.println("Result: " + 2 + 1 * 5");
The compilation would fail. There is an unclosed string literal, 5", on each line.

Question #15
Which code fragment is illegal?

  1. A
    Option A
  2. B
    Option B
  3. C
    Option C
  4. D
    Option D

Correct Answer:
D
The abstract keyword cannot be used to declare an int variable.
The abstract keyword is used to declare a class or method to be abstract[3]
. An abstract method has no implementation; all classes containing abstract methods must themselves be abstract, although not all abstract classes have abstract methods.

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