Practice Exercises Java - Learn to program performing exercises with Java

Practice Exercises Java

Learn to program performing exercises with Java

12 Lessons Java with the Solutions - 228 Exercises Java with the solutions
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Catalog + Menu - Practice Exercises Java


Lesson 7:

More on classes


Exercise 7.13:

Catalog + Menu


Objetive:

Improve the Catalog program, so that "Main" displays a menu to allow entering new data of any kind, as well as displaying all the data stored.


Source Code:


import java.util.*;
public class ComplexNumber
{
	protected double a, b;

	public ComplexNumber(double realPart, double imaginaryPart)
	{
		a = realPart;
		b = imaginaryPart;
	}

	public final double GetReal()
	{
		return a;
	}

	public final void SetReal(double a)
	{
		this.a = a;
	}

	public final double GetImaginary()
	{
		return b;
	}

	public final void SetImaginary(double b)
	{
		this.b = b;
	}

	public final String toString()
	{
		return "(" + a + "," + b + ")";
	}

	public final double GetMagnitude()
	{
		return Math.sqrt((a * a) + (b * b));
	}

	public final void Add(ComplexNumber c2)
	{
		a += c2.GetReal();
		b += c2.GetImaginary();
	}

}

public class Main
{
	public static void main(String[] args)
	{
		boolean debug = false;

		ComplexNumber number = new ComplexNumber(5, 2);
		System.out.println("Number is: " + number.toString());

		number.SetImaginary(-3);
		System.out.println("Number is: " + number.toString());

		System.out.print("Magnitude is: ");
		System.out.println(number.GetMagnitude());

		ComplexNumber number2 = new ComplexNumber(-1, 1);
		number.Add(number2);
		System.out.print("After adding: ");
		System.out.println(number.toString());

		if (debug)
		{
			new Scanner(System.in).nextLine();
		}
	}
}
Exercisey 7.13




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