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NEW QUESTION 1
Which statement is true about Java byte code?
- A. It can run on any platform.
- B. It can run on any platform only if it was compiled for that platform.
- C. It can run on any platform that has the Java Runtime Environment.
- D. It can run on any platform that has a Java compiler.
- E. It can run on any platform only if that platform has both the Java Runtime Environment and a Java compiler.
Answer: ACDE
NEW QUESTION 2
Given the code fragments:
Which modification enables the code to compile?
- A. Replace line n1 with:import p1.*;Replace line n2 with:import p1. p2.*;
- B. Replace line n1 with:import p1. A;Replace line n2 with:import p1.*;
- C. Replace line n1 with:import p1. A;Replace line n2 with:import p1. A;import p1. p2.B ;
- D. Replace line n1 with:import p1;Replace line n2 with:import p1;import p1. p2;
Answer: C
NEW QUESTION 3
Given the code fragment:
What is the result?
- A. Sum is 600
- B. Compilation fails at line n1.
- C. Compilation fails at line n2.
- D. A ClassCastException is thrown at line n1.
- E. A ClassCastException is thrown at line n2.
Answer: C
NEW QUESTION 4
Given:
What is the result?
- A. 200.0 : 100.0
- B. 400.0 : 200.0
- C. 400.0 : 100.0
- D. Compilation fails.
Answer: C
NEW QUESTION 5
Given:
What is the result?
- A. int main 1
- B. Object main 1
- C. String main 1
- D. Compilation fails
- E. An exception is thrown at runtime
Answer: C
NEW QUESTION 6
Given the following class:
Which two changes would encapsulate this class and ensure that the area field is always equal to length * height whenever the Rectangle class is used?
- A. Call the setArea method at the end of the setHeight method.
- B. Call the setArea method at the beginning of the setHeight method.
- C. Call the setArea method at the end of the setLength method.
- D. Call the setArea method at the beginning of the setLength method.
- E. Change the setArea method to private.
- F. Change the area field to public.
Answer: AE
NEW QUESTION 7
What is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?
- A. Encapsulation
- B. Inheritance
- C. Abstraction
- D. Instantiation
- E. Polymorphism
Answer: A
Explanation: Explanation
Using the private modifier is the main way that an object encapsulates itself and hide data from the outside world.
NEW QUESTION 8
Given the following class:
And given the following main method, located in another class:
Which three lines, when inserted independently at line n1, cause the program to print a 0 balance?
- A. this.amount = 0;
- B. amount = 0;
- C. acct (0) ;
- D. acct.amount = 0;
- E. acc
- F. getAmount () = 0;
- G. acct.changeAmount(0);
- H. acct.changeAmount(-acct.amount);
- I. acct.changeAmount(-acct.getAmount());
Answer: ACD
NEW QUESTION 9
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 10
Given the following class declarations: Which answer fails to compile?
- A. Option A
- B. Option B
- C. Option C
- D. Option D
- E. Option E
Answer: E
NEW QUESTION 11
Given the code fragment:
Which code fragment, when inserted at line 9, enables the code to print true?
- A. String str2 = str1;
- B. String str2 = new String (str1);
- C. String str2 = sb1. toString ();
- D. String str2 = "Duke";
Answer: C
NEW QUESTION 12
Given:
And given the commands: javac Test.java
java Test
What is the result?
- A. Java SE
- B. Java EE
- C. Compilation fails at line n1.
- D. A NullPointerException is thrown at runtime.
Answer: B
NEW QUESTION 13
Given the code fragment:
What is the result?
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer: C
NEW QUESTION 14
Given the code fragments:
Which modification enables the code to compile?
- A. Replace line n1 with: import p1.A;Replace line n2 with: import p1.A;import p1.p2.B;
- B. Replace line n1 with: import p1;Replace line n2 with: import p1;import p1.p2;
- C. Replace line n1 with: import p1.A;Replace line n2 with: import p1.*;
- D. Replace line n1 with: import p1.*;Replace line n2 with: import p1.p2.*;
Answer: D
NEW QUESTION 15
Given:
What is the result?
- A. 10 20 30 40
- B. 0 0 30 40
- C. Compilation fails.
- D. An exception is thrown at runtime.
Answer: B
NEW QUESTION 16
Which three statements are true about the structure of a Java class?
- A. A public class must have a main method.
- B. A class can have only one private constructor.
- C. A method can have the same name as a field.
- 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: BCF
NEW QUESTION 17
Given the code fragment:
What is the result?
- A. true true
- B. true false
- C. false false
- D. false true
Answer: C
NEW QUESTION 18
Given the code fragments:
Which code fragment, when inserted at line n1, enables the code to print Hank?
- A. checkAge (iList, ( ) ->
- B. get Age ( ) > 40);
- C. checkAge(iList, Person p -> p.getAge( ) > 40);
- D. checkAge (iList, p -> p.getAge ( ) > 40);
- E. checkAge(iList, (Person p) -> { p.getAge() > 40; });
Answer: C
NEW QUESTION 19
Given the code fragment:
What is the result?
- A. 3
- B. 4
- C. -1
- D. Compilation fails.
Answer: B
NEW QUESTION 20
Which statement is true about the switch statement?
- A. It must contain the default section.
- B. The break statement, at the end of each case block, is mandatory.
- C. Its case label literals can be changed at runtime.
- D. Its expression must evaluate to a single value.
Answer: D
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