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1Z0-808 Exam Topics
These are the following topics covered in our Oracle 1Z0-808 exam dumps which include:
- Working With Java Data Types
- Working with Inheritance
- Creating and Using Arrays
- Working with Methods and Encapsulation
- Using Loop Constructs
- Using Operators and Decision Constructs
NEW QUESTION # 85
What is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?
- A. Abstraction
- B. Inheritance
- C. Encapsulation
- D. Instantiation
- E. Polymorphism
Answer: C
Explanation:
Using the private modifier is the main way that an object encapsulates itself and hide data from the outside world.
Reference: http://www.tutorialspoint.com/java/java_access_modifiers.htm
NEW QUESTION # 86
Given the code fragment:
What is the result?
- A. Compilation fails
- B. A Work done
- C. A B C Work done
- D. A B C D Work done
Answer: B
NEW QUESTION # 87
Given:
What is the result?
- A. Area is 6.0
- B. Area is 3.0
- C. Compilation fails at line n1
- D. Compilation fails at line n2.
Answer: D
NEW QUESTION # 88
Given:
And given the commands:
What is the result?
- A. Failure
- B. An exception is thrown at runtime
- C. Compilation fails.
- D. Success
Answer: D
NEW QUESTION # 89
Given:
And given the commands:
javac Test.java
java Test TRUE null
What is the result?
- A. false false
- B. AClassCastExceptionis thrown at runtime.
- C. true false
- D. TRUE null
- E. true true
Answer: C
NEW QUESTION # 90
Given the code fragment:
What is the result?
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer: C
NEW QUESTION # 91
Which two are benefits of polymorphism? (Choose two.)
- A. More efficient code at runtime
- B. More flexible and reusable code
- C. Faster code at runtime
- D. More dynamic code at runtime
- E. Code that is protected from extension by other classes
Answer: A,B
Explanation:
Explanation/Reference:
Reference: https://www.cs.princeton.edu/courses/archive/fall98/cs441/mainus/node5.html
NEW QUESTION # 92
Given this segment of code:
Which two statements, if either were true, would make the code compile? (Choose two.)
- A. Cycle is an abstract superclass of MotorCycle.
- B. Cycle and MotorCycle both implement the Transportation interface.
- C. MotorCycle is an interface that implements the Cycle class.
- D. Cycle and MotorCycle both extend the Transportation superclass.
- E. Cycle is an interface that is implemented by the MotorCycle class.
- F. MotorCycle is a superclass of Cycle.
Answer: A,E
NEW QUESTION # 93
Given the code fragment:
What is the result?
- A. 0
- B. Compilation fails.
- C. 1
- D. 2
Answer: C
NEW QUESTION # 94
Given the code fragment:
Which modification enables the code to print 54321?
- A. Replace line 6 with System, out. print (--x) ;
- B. Replace line 12 With return (x > 0) ? false: true;
- C. Replace line 6 with --x; and, at line 7, insert system, out. print (x);
- D. At line7, insert x --;
Answer: A
NEW QUESTION # 95
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: A,C
Explanation:
A is true because there are two types of for loop in Java. Classic and Enhanced.
B is true because we can run code like for( ; expr2 ; expr3).
C is false because expr2 is evaluated BEFORE each iteration.
D is false because we can run code like for(expr1; expr2; ).
http://www.java-tips.org/java-se-tips-100019/24-java-lang/480-the-enhanced-for-loop.html
NEW QUESTION # 96
Given the code fragment:
What is the result?
- A. 0
- B. Compilation fails
- C. 1
- D. 2
- E. 3
Answer: B
NEW QUESTION # 97
Given the code fragments:
What is the result?
- A. Compilation fails only at line n2.
- B. Compilation fails only at line n1.
- C. RTool::exportTool::export
- D. Tool::exportTool::export
- E. Compilation fails at both line n1 and line2.
Answer: B
NEW QUESTION # 98
Given this class:
And given this main method, located in another class:
Which three lines, when inserted independently at line n1, cause the program to print a 0 balance?
- A. acct.setAmount(0);
- B. acct.changeAmount(0); <option F earlier>
- C. acct.changeAmount(-acct.amount); <option G earlier>
- D. this.amount = 0; <option A earlier>
- E. acct.amount = 0; <option D earlier>
- F. acct.setAmount(-acct.getAmount());
- G. acct.getAmount() = 0; <option E earlier>
Answer: B,E,G
NEW QUESTION # 99
Given the code fragment:
Which code fragment, when inserted at line 9, enables the code to print true?
- A. String str2 = sb1. toString ();
- B. String str2 = str1;
- C. String str2 = new String (str1);
- D. String str2 = "Duke";
Answer: B
NEW QUESTION # 100
Given the code fragment:
What is the result?
- A. Null element 0Null element 1
- B. NullNull
- C. Element 0Element 1
- D. A NullPointerException is thrown at runtime.
Answer: B
NEW QUESTION # 101
Which two are valid instantiations and initializations of a multi dimensional array?
- A. Option E
- B. Option A
- C. Option C
- D. Option D
- E. Option B
Answer: D,E
Explanation:
In the Java programming language, a multidimensional array is simply an array whose components are themselves arrays.
NEW QUESTION # 102
Given the code fragment:
Which code fragment, when inserted at line 3, enables the code to print 10:20?
A:
B:
C:
D:
- A. Option A
- B. Option C
- C. Option B
- D. Option D
Answer: C
NEW QUESTION # 103
Which two are benefits of polymorphism?
- A. More flexible and reusable code
- B. More efficient code at runtime
- C. Faster code at runtime
- D. More dynamic code at runtime
- E. Code that is protected from extension by other classes
Answer: B,D
NEW QUESTION # 104
Given the code fragment:
Which two code fragments inserted at line 10 print ****?
- A.
- B.
- C.
- D.
- E.
Answer: D
Explanation:
NEW QUESTION # 105
......
Oracle 1z0-808 Certification Exam focuses on the fundamental concepts of Java programming, including data types, variables, arrays, control structures, and operators. It also covers the Object-Oriented Programming (OOP) concepts such as encapsulation, inheritance, and polymorphism. Additionally, the exam tests the candidates' knowledge of Java APIs and their ability to use them to create applications.
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