//me learning ArrayLists 😊 Get a collection of precious gemstones, the amount and quality is randomized. Can you get a diamond of the best quality? 💎😃 //*the quality is calculated based on the clarity and the points(carat fractions) of the gemstone import java.util.ArrayList; import java.util.Random; public class Gem { protected double carats; protected int clarity; protected String name = ""; protected static String getQuality(Gem g) { int points; String quality; points = (int)g.carats * 100; quality = (points>100)&&(g.clarity==0)?"the best":(points>80)&&(g.clarity<=3)?"very high":(points>50)&&(g.clarity<=5)?"good":(g.clarity<=7)?"average":(g.clarity>7)?"poor":"unclassified"; return quality; } protected static void info (Gem g) { String quality = g.getQuality(g); String ct = String.format("%2.2f", g.carats); System.out.println(ct+ "ct. " +g.name+ " of " +quality+ " quality!"); } public static class Diamond extends Gem { Diamond (int clarity, double carats) { this.name = "Diamond"; this.clarity = clarity; this.carats = carats; } } public static class Ruby extends Gem { Ruby (int clarity, double carats) { this.name = "Ruby"; this.clarity = clarity; this.carats = carats; } } public static class Sapphire extends Gem { Sapphire (int clarity, double carats) { this.name = "Sapphire"; this.clarity = clarity; this.carats = carats; } } public static class Emerald extends Gem { Emerald (int clarity, double carats) { this.name = "Emerald"; this.clarity = clarity; this.carats = carats; } } public static class Topaz extends Gem { Topaz (int clarity, double carats) { this.name = "Topaz"; this.clarity = clarity; this.carats = carats; } } public static class Amethyst extends Gem { Amethyst (int clarity, double carats) { this.name = "Amethyst"; this.clarity = clarity; this.carats = carats; } } public static void main(String[] args) { Random r = new Random(); int a = 2 + r.nextInt(5); ArrayList gems = new ArrayList(); for (int i =0; i< a; i++) { Random r2 = new Random(); Random r3 = new Random(); Random r4 = new Random(); int decider = r2.nextInt(15); int cl = r3.nextInt(11); double ct = 0.1 + (3.0 - 0.1) * r4.nextDouble(); Gem ruby = new Ruby(cl,ct); Gem diamond = new Diamond(cl,ct); Gem amethyst = new Amethyst(cl,ct); Gem topaz = new Topaz(cl,ct); Gem emerald = new Emerald(cl,ct); Gem sapphire = new Sapphire(cl,ct); if (decider==0) { gems.add(diamond); } else if (decider >0 && decider <=3) { gems.add(sapphire); } else if (decider >3 && decider <=6){ gems.add(topaz); } else if (decider >6 && decider <=9){ gems.add(amethyst); } else if (decider >9 && decider <=11){ gems.add(emerald); } else if (decider >11 && decider <=13){ gems.add(ruby); } else { gems.clear(); } } if (gems.size() != 0) { System.out.println("You got "+gems.size()+ " gems! \n"); int d = 4; for (int i = 1; i <= d+1; i++) { for (int j = 1; j <= d; j++) { System.out.print(" "); } d--; for (int j = 1; j<= 2*i-1; j++) { System.out.print("."); } System.out.print(" \n"); } d = 1; for (int i = 1; i <= 4; i++) { for (int j = 1; j <= d; j++) { System.out.print(" "); } d++; for (int j = 1; j <= 2*(5-i)-1; j++) { System.out.print("."); } System.out.print(" \n"); } System.out.println(); System.out.println("Your gems are:\n"); for (Gem g: gems) { g.info(g); } } else { System.out.println("You got no gems :("); } } }

Gems