1. What is a class constructor used for?
2. How do constructors differ from other methods in a class?
3. What is the difference between private and public attributes and methods in a class?
Use the class below to answer questions 4 through 6.
public class Sample {
public int attrib1;
public double attrib2;
private String nameObject;
private final int PI = 3.14;
public Sample(int data1, String data2, double data3) {
attrib1 = data1;
nameObject = data2;
attrib2 = data3;
}
private int someMethod() {
//This method will return an integer value
return attrib1;
}
public double calcArea() {
//This method does not accept any arguments
return PI*attrib2*attrib2;
}
public double calcAreaWithRad(double rad) {
//This method accepts one integer argument
return PI*rad*rad;
}
}
4. Which attributes could be directly accessed from outside the class?
5. Which methods could only be called from inside the class?
6. Write a line of code to create an object instance of the Sample class using the constructor defined in the class, passing it three appropriate parameter values.
