src/main/java/com/mycompany/roleta_desafios/Roleta_Desafios.java

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ */
+
+package com.mycompany.roleta_desafios;
+
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Random;
+import java.util.Scanner;
+
+/**
+ *
+ * @author 250407
+ */
+public class Roleta_Desafios {
+
+    public static void main(String[] args) throws IOException {
+        Scanner scanner = new Scanner(System.in);
+        String[] desafios = new String[10];
+        int total = lerFicheiro(desafios);
+        int opcao = -1;
+
+        while(opcao != 0){
+            System.out.println("|===Roleta de Desafios===|");
+            System.out.println("1 - girar roleta");
+            System.out.println("0 - sair");
+            System.out.println("|========================|");
+            opcao = scanner.nextInt();
+            
+            switch(opcao){
+                case 1:
+                    total = girar(desafios, total);
+                    break;
+                case 2:
+                    scanner.nextLine();
+                    System.out.println("escreve o desafio");
+                    String novo = scanner.nextLine();
+                    guardarDesafio(novo);
+                    System.out.println("desafio guardado");
+                    total = lerFicheiro(desafios);
+                    break;
+                case 0:
+                    System.out.println("Fim!");
+                    break;
+                default:
+                    System.out.println("opcao invalida");
+            }
+
+        }while(opcao != 0);      
+    }
+    
+    public static int lerFicheiro(String[] desafios){
+        int i = 0;
+        
+        try {
+            Scanner file = new Scanner(new File("Desafios.txt"));
+            while(file.hasNextLine() && i < desafios.length){
+                desafios[i] = file.nextLine();
+                i++;
+            }
+                
+        }catch(Exception e) {
+            System.out.println("erro ao ler ficheiro: " + e.getMessage());                      
+        }
+        return i;       
+    }
+    
+    public static void guardarDesafio(String desafio) throws IOException{
+        try{
+           FileWriter fileWriter = new FileWriter("Desafios.txt", true);
+           fileWriter.write(desafio);
+        }catch (IOException e){
+            System.out.println("Erro ao escrever" + e.getMessage());
+        }
+    }
+    public static int girar(String[] desafios, int total){
+        if (total == 0){
+            System.out.println("sem deafios disponiveis!");
+            return total;            
+        }
+        Random random  = new Random();
+        System.out.println("A girar a Roleta...");
+        int delay = 50;
+        
+        try{
+            for(int i = 0; i < 20; i++){
+                int indice = random .nextInt(total);
+                
+                System.out.println("\rDesafio: " + desafios[indice]);
+                Thread.sleep(delay);
+                delay += 30;            
+            }
+            int finalIndex = random.nextInt(total);
+            System.out.println(">>>>Desafio Final:<<<< " + desafios[finalIndex]);
+            
+            for(int i  = finalIndex; i < total - 1; i++){
+                desafios[i] = desafios[i + 1];
+            }
+            total--;
+                      
+        }catch (InterruptedException e){
+            System.out.println("erro na animacao.");
+            
+        }
+        
+        return total;
+    }
+}
+    
+
+    
+
+
+        
+   
+        
+    
+