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NEW QUESTION # 169
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. ArithmeticException, FileNotFoundException, NumberFormatException
- B. ArrayIndexOutOfBoundException, IllegalArgumentException, FileNotFoundException
- C. FileNotFoundException, IOException, SQLException
- D. AssertionError, ArrayIndexOutOfBoundsException, ArithmeticException
- E. AssertionError, IOError, IOException
Answer: D
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)
NEW QUESTION # 170
Given:
And given the commands:
What is the result?
- A. A NullPointerException is thrown at runtime.
- B. Compilation fails at line n1.
- C. Java EE
- D. Java SE
Answer: C
NEW QUESTION # 171
Given the code fragment:
And given the requirements:
1. Process all the elements of the array in the order of entry.
2. Process all the elements of the array in the reverse order of entry.
3. Process alternating elements of the array in the order of entry.
Which two statements are true? (Choose two.)
- A. Requirements 2 and 3 CANNOT be implemented by using the standard for loop.
- B. Requirements 1, 2, and 3 can be implemented by using the standard for loop.
- C. Requirement 3 CANNOT be implemented by using either the enhanced for loop or the standard for loop.
- D. Requirement 1 can be implemented by using the enhanced for loop.
- E. Requirements 1, 2, and 3 can be implemented by using the enhanced for loop.
Answer: C,D
NEW QUESTION # 172
Given the code fragment:
What is the result?
- A. Compilation fails.
- B. 1 2 3 4
- C. 1 2 3 4followed by an ArrayIndexOutOfBoundsException
- D. 1 2 3
Answer: C
NEW QUESTION # 173
Given:
What is the result?
- A. Compilation fails.
- B. 0
- C. 1
- D. 2
- E. 3
Answer: B
NEW QUESTION # 174
Given:
Which two classes use the shape class correctly?
- A. Option D
- B. Option A
- C. Option F
- D. Option C
- E. Option E
- F. Option B
Answer: E,F
Explanation:
When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (E). However, if it does not, then the subclass must also be declared abstract (B). Note: An abstract class is a class that is declared abstract-it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
NEW QUESTION # 175
Given:
And given the commands:
What is the result?
- A. false false
- B. true true
- C. true false
- D. A ClassCastExceptionis thrown at runtime.
- E. TRUE null
Answer: B
NEW QUESTION # 176
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. Compilation fails
- D. 2
- E. 3
Answer: C
NEW QUESTION # 177
Given the code fragment:
What is the result?
- A.
- B. Compilation fails at both line n2 and line n3.
- C. Compilation fails only at line n1.
- D. Compilation fails only at line n2.
- E. Compilation fails only at line n3.
Answer: E
NEW QUESTION # 178
Given:
And given the code fragment:
What is the result?
4W 100 Auto
- A. Compilation fails at both line n1 and line n2
- B. Compilation fails only at line n2
- C. Compilation fails only at line n1
- D. 4W 150 Manual
null 0 Auto - E. 4W 150 Manual
Answer: A
NEW QUESTION # 179
An unchecked exception occurs in a method dosomething()
Should other code be added in the dosomething() method for it to compile and execute?
- A. The Exception must be caught or declared to be thrown.
- B. The Exception must be declared to be thrown.
- C. The Exception must be caught
- D. No other code needs to be added.
Answer: D
Explanation:
Because the Java programming language does not require methods to catch or to specify unchecked exceptions (RuntimeException, Error, and their subclasses), programmers may be tempted to write code that throws only unchecked exceptions or to make all their exception subclasses inherit from RuntimeException. Both of these shortcuts allow programmers to write code without bothering with compiler errors and without bothering to specify or to catch any exceptions. Although this may seem convenient to the programmer, it sidesteps the intent of the catch or specify requirement and can cause problems for others using your classes.
NEW QUESTION # 180
Which three statements are true about the structure of a Java class?
- A. A method can have the same name as a field.
- B. A class can have only one private constructor.
- C. A public class must have a main method.
- D. A class can have overloaded static methods.
- E. The methods are mandatory components of a class.
- F. The fields need not be initialized before use.
Answer: A,B,D
Explanation:
A: Private constructors prevent a class from being explicitly instantiated by its
callers.
If the programmer does not provide a constructor for a class, then the system will always
provide a default, public no-argument constructor. To disable this default constructor,
simply add a private no-argument constructor to the class. This private constructor may be
empty.
B: The following works fine:
int cake() {
int cake=0;
return (1);
}
C: We can overload static method in Java. In terms of method overloading static method
are just like normal methods and in order to overload static method you need to provide
another static method with same name but different method signature.
Incorrect:
Not D: Only a public class in an application need to have a main method.
Not E:
Example:
class A
{
public string something;
public int a;
}
Q: What do you call classes without methods? Most of the time: An anti pattern.
Why? Because it faciliates procedural programming with "Operator" classes and data structures. You separate data and behaviour which isn't exactly good OOP.
Often times: A DTO (Data Transfer Object)
Read only datastructures meant to exchange data, derived from a business/domain object.
Sometimes: Just data structure.
Well sometimes, you just gotta have those structures to hold data that is just plain and simple and has no operations on it.
Not F: Fields need to be initialtized. If not the code will not compile.
Example:
Uncompilable source code - variable x might not have been initialized
NEW QUESTION # 181
Given the code fragment:
Which three lines fail to compile? (Choose three.)
- A. Line 8
- B. Line 7
- C. Line 12
- D. Line 10
- E. Line 9
- F. Line 11
Answer: B,C,D
NEW QUESTION # 182
Given:
What is the result?
- A. integer sum is 30float sum is 30.0
- B. int sum is 30float sum is 30.0
- C. integer sum is 30double sum is 30.0
- D. int sum is 30double sum is30.0
Answer: D
NEW QUESTION # 183
Given the code fragment:
What is the result?
- A. A DateTimeException is thrown at runtime.
- B. 2012-02-10 00:00
- C. 2012-01-30
- D. 2012-02-10
Answer: C
NEW QUESTION # 184
Given:
What is the result?
- A. null
Richard
Donald - B. Compilation fails.
- C. An ArrayIndexOutOfBoundsException is thrown at runtime.
- D. A NullPointerExceptionis thrown at runtime.
- E. Richard
Donald
Answer: A
NEW QUESTION # 185
Given the code fragment:
Which two modifications enable the code to compile?
- A. Make the method at line 2 public.
- B. Make the method at line 8 public.
- C. Make the method at line 8 protected.
- D. Make the method at line 4 public.
- E. Make the method at line 10 protected.
Answer: C,E
NEW QUESTION # 186
Given the code fragment:
What is the result?
- A. 5 : 5
- B. Compilation fails.
- C. 5 : 10
- D. 10 : 10
Answer: D
NEW QUESTION # 187
Which three are advantages of the Java exception mechanism? (Choose three.)
- A. Improves the program structure because exceptions must be handled in the method in which they occurred
- B. Improves the program structure because the error handling code is separated from the normal program function
- C. Provides a set of standard exceptions that covers all the possible errors
- D. Improves the program structure because the programmer can choose where to handle exceptions
- E. Allows the creation of new exceptions that are tailored to the particular program being created
Answer: A,B,D
Explanation:
Explanation/Reference:
Reference: http://javajee.com/introduction-to-exceptions-in-java
NEW QUESTION # 188
Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?
- A. This is not the only valid for loop construct; there exits another form of for loop constructor.
- B. The expression expr3 must be present. It is evaluated after each iteration through the loop.
- C. The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
- D. When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
Answer: C,D
Explanation:
The for statement have this forms:
for (init-stmt; condition; next-stmt) {
body
}
There are three clauses in the for statement.
The init-stmt statement is done before the loop is started, usually to initialize an iteration
variable.
The condition expression is tested before each time the loop is done. The loop isn't
executed if the boolean expression is false (the same as the while loop).
The next-stmt statement is done after the body is executed. It typically increments an
iteration variable.
NEW QUESTION # 189
Given the code fragment:
What is the result?
A B C Work done
- A. A B C D Work done
- B.
- C. Compilation fails
- D. A Work done
Answer: D
Explanation:
Explanation
Explanation:
NEW QUESTION # 190
Which two are benefits of polymorphism? (Choose two.)
- A. Faster code at runtime
- B. Code that is protected from extension by other classes
- C. More dynamic code at runtime
- D. More flexible and reusable code
- E. More efficient code at runtime
Answer: D,E
NEW QUESTION # 191
Given the code fragment:
What is the result?
- A. Option D
- B. Option B
- C. Option A
- D. Option C
Answer: D
NEW QUESTION # 192
......
Oracle 1z0-808 exam covers a wide range of topics related to Java programming, including data types, operators, control statements, classes, methods, and arrays. 1z0-808 exam also covers object-oriented programming concepts such as inheritance, polymorphism, and encapsulation. Other topics covered in the exam include exception handling, file I/O, and basic Java APIs. 1z0-808 exam consists of 70 multiple-choice questions and has a duration of 150 minutes. A passing score of 65% is required to obtain the certification.
Passing the Oracle 1z1-808 certification exam demands a good understanding of the Java programming language. Candidates must have a strong foundation in the fundamentals of Java programming, as well as experience with developing Java applications. 1z0-808 exam tests your knowledge of Java syntax and semantics, object-oriented programming, and the use of common Java APIs.
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