Assume a class file exists as described by the UML diagram. School - roll : int

Question

Assume a class file exists as described by the UML diagram.

School

- roll : int

- name : String

+ School (rollIn : int, nameIn : String)

+ School ()

+ setRoll ( rollIn : int) : void

+ setName ( nameIn : String) : void

+ getRoll () : int

+ getName ()

Write a main method which

· Makes an instance of this class using the default constructor.

· Calls the mutator methods to set the value of the data fields to 132 and “good St”.

· Makes a second instance of this class, setting the value of the data fields to 350 and “Hello St” via a constructor.

· Determines and displays the name of the school with the largest roll.

Explanation / Answer

There you go !

class School{
int roll;
String name;
School(){
  // Does nothing
}
School(int rollIn,String nameIn){
  roll = rollIn;
  name = nameIn;
}
public void setRoll(int rollIn){
  roll = rollIn;
}
public void setName(String nameIn){
  name = nameIn;
}
public int getRoll(){
  return roll;
}
public String getName(){
  return name;
}
}
class DriverClass{
public static void main(String[] args) {
  School inst1 = new School();
  inst1.setRoll(132);
  inst1.setName("good St");
  School inst2 = new School(350,"Hello St");
  //Printing School with largest roll number using ternary operator
  /*
  A ternary operator works the following way
  System.out.print( 3 > 2 ? "Foo" : "Bar" );
  Output: Foo
  System.out.print( 1 > 2 ? "Foo" : "Bar" );
  Output: Bar
  */
  // It will display Hello St for obvious reasons
  System.out.println((inst1.getRoll() > inst2.getRoll() ? inst1.getName() : inst2.getName()));
}
}

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