Question

Draw a UML class diagram (with associations) to show the design of the Java application.

public class OOPExercises {

    public static void main(String[] args) {

        //A objA = new A();

        B objB = new B();

        System.out.println("in main(): ");

        //System.out.println("objA.a = "+objA.getA());

        System.out.println("objB.b = "+objB.getB());

        //objA.setA (222);

        objB.setB (333.33);

        //System.out.println("objA.a = "+objA.getA());

        System.out.println("objB.b = "+objB.getB());

    }

}

public class A {

    int a = 100;

    public A() {

        System.out.println("in the constructor of class A: ");

        System.out.println("a = "+a);

        a = 333;

        System.out.println("a = "+a);

    }

    public void setA( int value) {

        a = value;

    }

    public int getA() {

        return a;

    }

} //class A

public class B extends A {

    double b = 123.45;

    public B() {

        System.out.println("-----in the constructor of class B: ");

        System.out.println("b = "+b);

        b = 3.14159;

        System.out.println("b = "+b);

    }

    public void setB( double value) {

        b = value;

    }

    public double getB() {

        return b;

    }

} //class B

Answer 1

UML diagram of the above classes:

a: int (default access) + setA(value : int) : void t getA(void) int Generalization Specialization b: double (default access) setB(value: int): void +getB(void): double

The above program shows Inheritance Relationship. A is the base class and B is the derived class.