ITCertMaster Oracle 1z0-808 exam practice questions and answers

NO.1 Given the code fragment:
System.out.printIn("Result: " + 2 + 3 + 5);
System.out.printIn("Result: " + 2 + 3 * 5);
What is the result?
A. Result: 10 Result: 30
B. Result: 10 Result: 25
C. Result: 235 Result: 215
D. Result: 215 Result: 215
E. Compilation fails
Answer: C

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Explanation:
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.

NO.2 Which two are valid instantiations and initializations of a multi dimensional array?
A. Option A
B. Option B
C. Option C
D. Option D
E. Option E
Answer: B,D

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Explanation:
In the Java programming language, a multidimensional array is simply an array whose components
are themselves arrays.

NO.3 Given the code fragment:
What is the result?
A. Valid
B. Not valid
C. Compilation fails
D. An IllegalArgumentException is thrown at run time
Answer: C

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Explanation:
In segment 'if (valid)' valid must be of type boolean, but it is a string. This makes the compilation fail.

NO.4 Given:
package p1;
public class Test {
static double dvalue;
static Test ref;
public static void main(String[] args) {
System.out.println(ref);
System.out.println(dvalue);
}
}
What is the result?
A. p1.Test.class
0.0
B. <the summary address refrenced by ref> 0.000000
C. Null
0.0
D. Compilation fails
E. A NullPointerException is thrown at runtime
Answer: C

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NO.5 View the exhibit.
Given the code fragment:
Which change enables the code to print the following?
James age: 20 Williams age: 32
A. Replacing line 5 with public static void main (String [] args) throws MissingInfoException,
AgeOutofRangeException {
B. Replacing line 5 with public static void main (String [] args) throws.Exception {
C. Enclosing line 6 and line 7 within a try block and adding: catch(Exception e1) { //code goes here}
catch (missingInfoException e2) { //code goes here} catch (AgeOutofRangeException e3) {//code goes
here}
D. Enclosing line 6 and line 7 within a try block and adding: catch (missingInfoException e2) { //code
goes here} catch (AgeOutofRangeException e3) {//code goes here}
Answer: C

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NO.6 Given the classes:
*AssertionError
*ArithmeticException
*ArrayIndexOutofBoundsException
*FileNotFoundException
*IllegalArgumentException
*IOError
*IOException
*NumberFormatException
*SQLException
Which option lists only those classes that belong to the unchecked exception category?
A. AssertionError, ArrayIndexOutOfBoundsException, ArithmeticException
B. AssertionError, IOError, IOException
C. ArithmeticException, FileNotFoundException, NumberFormatException
D. FileNotFoundException, IOException, SQLException
E. ArrayIndexOutOfBoundException, IllegalArgumentException, FileNotFoundException
Answer: A

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Explanation:
Not B: IOError and IOException are both checked errors.
Not C, not D, not E: FileNotFoundException is a checked error.
Note:
Checked exceptions:
*represent invalid conditions in areas outside the immediate control of the program (invalid user
input, database problems, network outages, absent files)
*are subclasses of Exception
*a method is obliged to establish a policy for all checked exceptions thrown by its implementation
(either pass the checked exception further up the stack, or handle it somehow)
Note:
Unchecked exceptions:
*represent defects in the program (bugs) - often invalid arguments passed to a non-private method.
To quote from The Java Programming Language, by Gosling, Arnold, and Holmes: "Unchecked
runtime exceptions represent conditions that, generally speaking, reflect errors in your program's
logic and cannot be reasonably recovered from at run time."
*are subclasses of RuntimeException, and are usually implemented using IllegalArgumentException,
NullPointerException, or IllegalStateException
*method is not obliged to establish a policy for the unchecked exceptions thrown by its
implementation (and they almost always do not do so)

NO.7 Given the code fragment:
Which code fragment, when inserted at // insert code here, enables the code to compile and and
print a b c?
A. List update (String[] strs)
B. Static ArrayListupdate(String [] strs)
C. Static List update (String [] strs)
D. Static void update (String[] strs)
E. ArrayList static update(String [] strs)
Answer: E

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NO.8 Given:
What is the result?
A. They match They really match
B. They really match
C. They match
D. Nothing Prints
E. They really match They really match
Answer: B

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Explanation:
The strings are not the same objects so the == comparison fails. See note #1 below.
As the value of the strings are the same equals is true. The equals method compares values for
equality.
Note: #1 ==
Compares references, not values. The use of == with object references is generally limited to the
following:
Comparing to see if a reference is null.
Comparing two enum values. This works because there is only one object for each enum constant.
You want to know if two references are to the same object.

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