Mass Units Converter (Java)

714/5000
Hello again, here I bring a preview of an application that I am working on, this is an erasure of what will be just a mini function to make conversions of units of mass, the long-term idea is to make a great application that will allow us perform calculations, analysis, graphs, etc. of Secondary and University Physics problems.

The algorithm: it is simple is based on the use of float variables, to save momoria space, and the use of the structure in case, or "switch case".

I took this graph as a reference that gives us an idea of what is being executed (it is not a flow diagram at all, it is only the graphic reference to perform the calculations)

package conversor.de.unidades.de.masa;

import javax.swing.JOptionPane;

/**

• 
  */
  public class ConversorDeUnidadesDeMasa {@author ROBERT

  /**

  • 
    */
    public static void main(String[] args) {
    // TODO code application logic here@param args the command line arguments

    float gramo,decigramo,centigramo,miligramo,decagramo,hectogramo,kilogramo,conversion;
    int opcion_p,opcion_kg,opcion_hg,opcion_dag,opcion_g,opcion_dg,opcion_cg,opcion_mg;

    opcion_p=Integer.parseInt(JOptionPane.showInputDialog(null, "Conversor de Unidades de Masa\n\n"
    +"1)Kilogramo\n"
    + "2)Hectogramo\n"
    + "3)Decagramo\n"
    + "4)Gramo\n"
    + "5)Decigramo\n"
    + "6)Centigramo\n"
    + "7)Miligramo\n"
    + "8)Salir"));

    switch(opcion_p) {
    case 1:kilogramo=Float.parseFloat(JOptionPane.showInputDialog(null, "Digite cantidad en kg"));
    opcion_kg=Integer.parseInt(JOptionPane.showInputDialog(null, "Convertir a: \n"
    + "1)Hectogramo\n"
    + "2)Decagramo\n"
    + "3)Gramo\n"
    + "4)Decigramo\n"
    + "5)Centigramo\n"
    + "6)Miligramo\n"));
    switch(opcion_kg) {
    case 1: conversion=kilogramo10;
    JOptionPane.showMessageDialog(null, +conversion+" hg");
    break;
    case 2:conversion=kilogramo100;
    JOptionPane.showMessageDialog(null, +conversion+" dag");
    break;
    case 3:conversion=kilogramo1000;
    JOptionPane.showMessageDialog(null, +conversion+" g");
    break;
    case 4:conversion=kilogramo10000;
    JOptionPane.showMessageDialog(null, +conversion+" dg");
    break;
    case 5:conversion=kilogramo100000;
    JOptionPane.showMessageDialog(null, +conversion+" cg");
    break;
    case 6:conversion=kilogramo1000000;
    JOptionPane.showMessageDialog(null, +conversion+" mg");
    break;
    default:
    JOptionPane.showMessageDialog(null, "Opcion Invalida");
    break;

    }
    case 2:hectogramo=Float.parseFloat(JOptionPane.showInputDialog(null, "Digite cantidad en hg"));
    opcion_hg=Integer.parseInt(JOptionPane.showInputDialog(null, "Convertir a: \n"
    + "1)Kilogramo\n"
    + "2)Decagramo\n"
    + "3)Gramo\n"
    + "4)Decigramo\n"
    + "5)Centigramo\n"
    + "6)Miligramo\n"));
    switch(opcion_hg) {
    case 1: conversion=hectogramo/10;
    JOptionPane.showMessageDialog(null, +conversion+" kg");
    break;
    case 2:conversion=hectogramo10;
    JOptionPane.showMessageDialog(null, +conversion+" dag");
    break;
    case 3:conversion=hectogramo100;
    JOptionPane.showMessageDialog(null, +conversion+" g");
    break;
    case 4:conversion=hectogramo1000;
    JOptionPane.showMessageDialog(null, +conversion+" dg");
    break;
    case 5:conversion=hectogramo10000;
    JOptionPane.showMessageDialog(null, +conversion+" cg");
    break;
    case 6:conversion=hectogramo100000;
    JOptionPane.showMessageDialog(null, +conversion+" mg");
    break;
    default:
    JOptionPane.showMessageDialog(null, "Opcion Invalida");
    break;
    }
    case 3:decagramo=Float.parseFloat(JOptionPane.showInputDialog(null, "Digite cantidad en dag"));
    opcion_dag=Integer.parseInt(JOptionPane.showInputDialog(null, "Convertir a: \n"
    + "1)Kilogramo\n"
    + "2)Hectogramo\n"
    + "3)Gramo\n"
    + "4)Decigramo\n"
    + "5)Centigramo\n"
    + "6)Miligramo\n"));
    switch(opcion_dag) {
    case 1: conversion=decagramo/100;
    JOptionPane.showMessageDialog(null, +conversion+" kg");
    break;
    case 2:conversion=decagramo/10;
    JOptionPane.showMessageDialog(null, +conversion+" hg");
    break;
    case 3:conversion=decagramo10;
    JOptionPane.showMessageDialog(null, +conversion+" g");
    break;
    case 4:conversion=decagramo100;
    JOptionPane.showMessageDialog(null, +conversion+" dg");
    break;
    case 5:conversion=decagramo1000;
    JOptionPane.showMessageDialog(null, +conversion+" cg");
    break;
    case 6:conversion=decagramo*10000;
    JOptionPane.showMessageDialog(null, +conversion+" mg");
    break;
    default:
    JOptionPane.showMessageDialog(null, "Opcion Invalida");
    break;
    }

    case 4:gramo=Float.parseFloat(JOptionPane.showInputDialog(null, "Digite cantidad en g"));
    opcion_g=Integer.parseInt(JOptionPane.showInputDialog(null, "Convertir a: \n"
    + "1)Kilogramo\n"
    + "2)Hectogramo\n"
    + "3)decagramo\n"
    + "4)Decigramo\n"
    + "5)Centigramo\n"
    + "6)Miligramo\n"));
    switch(opcion_g) {
    case 1: conversion=gramo/1000;
    JOptionPane.showMessageDialog(null, +conversion+" kg");
    break;
    case 2:conversion=gramo/100;
    JOptionPane.showMessageDialog(null, +conversion+" hg");
    break;
    case 3:conversion=gramo/10;
    JOptionPane.showMessageDialog(null, +conversion+" dag");
    break;
    case 4:conversion=gramo10;
    JOptionPane.showMessageDialog(null, +conversion+" dg");
    break;
    case 5:conversion=gramo100;
    JOptionPane.showMessageDialog(null, +conversion+" cg");
    break;
    case 6:conversion=gramo1000;
    JOptionPane.showMessageDialog(null, +conversion+" mg");
    break;
    default:
    JOptionPane.showMessageDialog(null, "Opcion Invalida");
    break;
    }
    case 5:decigramo=Float.parseFloat(JOptionPane.showInputDialog(null, "Digite cantidad en dg"));
    opcion_dg=Integer.parseInt(JOptionPane.showInputDialog(null, "Convertir a: \n"
    + "1)Kilogramo\n"
    + "2)Hectogramo\n"
    + "3)decagramo\n"
    + "4)gramo\n"
    + "5)Centigramo\n"
    + "6)Miligramo\n"));
    switch(opcion_dg) {
    case 1: conversion=decigramo/10000;
    JOptionPane.showMessageDialog(null, +conversion+" kg");
    break;
    case 2:conversion=decigramo/1000;
    JOptionPane.showMessageDialog(null, +conversion+" hg");
    break;
    case 3:conversion=decigramo/100;
    JOptionPane.showMessageDialog(null, +conversion+" dag");
    break;
    case 4:conversion=decigramo/10;
    JOptionPane.showMessageDialog(null, +conversion+" g");
    break;
    case 5:conversion=decigramo10;
    JOptionPane.showMessageDialog(null, +conversion+" cg");
    break;
    case 6:conversion=decigramo100;
    JOptionPane.showMessageDialog(null, +conversion+" mg");
    break;
    default:
    JOptionPane.showMessageDialog(null, "Opcion Invalida");
    break;
    }
    case 6:centigramo=Float.parseFloat(JOptionPane.showInputDialog(null, "Digite cantidad en cg"));
    opcion_cg=Integer.parseInt(JOptionPane.showInputDialog(null, "Convertir a: \n"
    + "1)Kilogramo\n"
    + "2)Hectogramo\n"
    + "3)decagramo\n"
    + "4)gramo\n"
    + "5)decigramo\n"
    + "6)Miligramo\n"));
    switch(opcion_cg) {
    case 1: conversion=centigramo/100000;
    JOptionPane.showMessageDialog(null, +conversion+" kg");
    break;
    case 2:conversion=centigramo/10000;
    JOptionPane.showMessageDialog(null, +conversion+" hg");
    break;
    case 3:conversion=centigramo/1000;
    JOptionPane.showMessageDialog(null, +conversion+" dag");
    break;
    case 4:conversion=centigramo/100;
    JOptionPane.showMessageDialog(null, +conversion+" g");
    break;
    case 5:conversion=centigramo/10;
    JOptionPane.showMessageDialog(null, +conversion+" dg");
    break;
    case 6:conversion=centigramo10;
    JOptionPane.showMessageDialog(null, +conversion+" mg");
    break;
    default:
    JOptionPane.showMessageDialog(null, "Opcion Invalida");
    break;
    }
    case 7:miligramo=Float.parseFloat(JOptionPane.showInputDialog(null, "Digite cantidad en mg"));
    opcion_mg=Integer.parseInt(JOptionPane.showInputDialog(null, "Convertir a: \n"
    + "1)Kilogramo\n"
    + "2)Hectogramo\n"
    + "3)Decagramo\n"
    + "4)Gramo\n"
    + "5)Decigramo\n"
    + "6)Centigramo\n"));
    switch(opcion_mg) {
    case 1: conversion=miligramo/1000000;
    JOptionPane.showMessageDialog(null, +conversion+" kg");
    break;
    case 2:conversion=miligramo/100000;
    JOptionPane.showMessageDialog(null, +conversion+" hg");
    break;
    case 3:conversion=miligramo/10000;
    JOptionPane.showMessageDialog(null, +conversion+" dag");
    break;
    case 4:conversion=miligramo/1000;
    JOptionPane.showMessageDialog(null, +conversion+" g");
    break;
    case 5:conversion=miligramo/100;
    JOptionPane.showMessageDialog(null, +conversion+" dg");
    break;
    case 6:conversion=miligramo/10;
    JOptionPane.showMessageDialog(null, +conversion+" cg");
    break;
    default:
    JOptionPane.showMessageDialog(null, "Opcion Invalida");
    break;
    }
    case 8:
    break;
    }

  }

}