Using Objects in AP Computer Science A
If a student-designed software application systematically analyzes social media trends and hashtags to identify key public interest topics, which void method would be most critical for continual update without returning any data?
public String getCurrentTrends()
private void logTrendData()
public boolean checkForNewHashtags()
public void updateTrendAnalysis()
What advantage does calling a void method have when writing code that performs repetitive tasks within different parts of a program?
It allows values to be returned so they can be used multiple times throughout the program.
It enables complex calculations that require intermediate results storage before proceeding further.
It promotes code reuse, reducing duplication and making maintenance easier.
It directly passes data between classes without needing object instantiation for access.
Which of the following statements correctly calls the setSpecies method for a Flower object named myFlower?
myFlower.setSpecies("Rose");
Flower.setSpecies("Rose");
setSpecies(myFlower, "Rose");
myFlower.species = "Rose";
If a class Game
has a void method initialize()
that sets up the game environment, which of the following correctly demonstrates calling this method from within a constructor in a subclass BoardGame
?
initialize()
Game.initialize()
BoardGame.initialize()
super.initialize()
In a Java program, what is the consequence of calling a void method within a System.out.println statement?
The output will be an empty string as the method returns no information to print.
It prints the memory address of where the method is stored in the program.
The output will be "null" since void methods do not return any value.
The code will not compile because void methods do not return a value.
What benefit does encapsulating calculations within their own non-void returning methods provide when building complex systems?
Modularization enables direct manipulation of data fields across classes
Optimization reduces memory overhead associated with local variable storage
Minimization decreases the overall number of classes implemented within a system
Abstraction facilitates understanding system components independently
How can introducing concurrency with threads while calling 'processTransactions()' cause inconsistent results if no synchronization mechanisms are used?
Shared resources like account balances may be accessed simultaneously causing race conditions
Incorrect calculation formulas implemented each transaction type lead inconsistencies
Logic determining which transactions processed first creates variability outputs
Additional checks added ensure data integrity slow down system leading variation output times

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Considering an object-oriented program that has classes Car and Engine where each Car has-an Engine; if Engine has method getHorsepower that returns an int, how would you extract this information for myCar object?
int hp = Engine.getHorsepower(myCar)
int hp = myCar.Engine.getHorsepower()
int hp = myCar.getEngine().getHorsepower()
int hp = getEngine(myCar).getHorsepower()
What potential bug could cause a void method designed to initialize all elements of an integer array to zero to leave some elements unchanged?
External methods modify the array after initialization occurs.
All array elements are mistakenly set to one rather than zero.
An exception is thrown because of dividing by zero inside the method.
The loop iterating over array elements terminates early due to an off-by-one error.
What must be true about the implementation of a non-void method named calculateOutput() that returns different data types depending on certain conditions within multiple related classes?
Each implementation can use overloading to vary by parameter list only while keeping consistent return types across all overloaded versions.
All implementations should throw checked exceptions corresponding to specific returning datatype.
The return type should be Object allowing any data type as return value, requiring explicit casting when accessing returned values.
Method overloading cannot be used because it doesn't allow changes in return type alone; conditional logic must handle returning different types wrapped into one common superclass or interface reference type.