Question

Consider the following class definition.

public class Info
{
private String name;
private int number;
public Info(String n, int num)
{
name = n;
number = num;
}
public void changeName(String newName)
{
name = newName;
}
public int addNum(int n)
{
num += n;
return num;
}
}
Which of the following best explains why the class will not compile?
The class is missing an accessor method.
The class is missing an accessor method.
A. The class is missing an accessor method.
B. The instance variables name and number should be designated public instead of private.
C. The return type for the Info constructor is missing.
D. The variable name is not defined in the changeName method.
E. The variable num is not defined in the addNum method.

Answer 1

The class 'Info' will not compile due to the improper use of a non-existent variable 'num' in the addNum method, which should be 'number' instead.

Step-by-step explanation:

The class 'Info' will not compile because of the error identified in option E: 'The variable num is not defined in the addNum method'. In the context of the class definition provided, number is the private instance variable, but the variable num does not exist in the scope of the addNum method. The method attempts to use num, which has not been declared within the class or method scope, leading to a compile-time error. To fix the error, we should replace num with number in the addNum method.