1.Reference-type variables (called references) store _____ in memory. 2. A contr
ID: 3855267 • Letter: 1
Question
1.Reference-type variables (called references) store _____ in memory.
2. A contractor uses a blueprint to build a house. An object is similar to
3. Set methods are also commonly called _____ methods.
4.Which of the following statements is false?
5.A class named Grades has a public method named calcAvg. Which statement is valid regarding an instance of that class that is created as
Grades myGrades = new Grades();
6. A key part of enabling the JVM to locate and call method main to begin the app’s execution is the _____ keyword, which indicates that main can be called without first creating an object of the class in which the method is declared.
7. The format specifier %.2f specifies that two digits of precision should be output _____ in the floating-point number.
8. Which statement is correct to complete the setNum method below?
public class Test
{
private int num;
public void setNum(int n)
{
//what goes here
}
}
9. What error, if any, is in the following code?
int num;
Scanner input = new Scanner(System.in);
System.out.print(“Enter a number: ”);
num = input.nextLine();
10. What does the following code display?
public class RentalApp {
public static void main(String[] args)
{
Rental r = new Rental();
r.setNumOfPersons(5);
r.addPerson();
r.addPerson();
System.out.println(r.getNumOfPersons());
}
}
public class Rental
{
private int numOfPersons;
public int getNumOfPersons()
{
return numOfPersons;
}
public void setNumOfPersons(int numOfPersons)
{
this.numOfPersons = numOfPersons;
}
public void addPerson()
{
numOfPersons = numOfPersons + 1;
}
}
Explanation / Answer
1) the memory location of an object
2) the house
3) mutator
4) Private instance variables are directly accessible outside of the class that contains them.
5) myGrades.calcAvg();
6) static
7) to the right of the decimal point
8) num = n;
9) The method nextInt must be used instead of nextLine.
10) 7
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