Reto mouredev#3 - Generador de contraseñas

Retos/Reto #3 - EL GENERADOR DE CONTRASEÑAS [Media]/java/vandresca.java

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+import java.util.*;
+
+/**
+ * Programa que genere una contraseña en la que se pueda:
+ * - Elegir si tiene 8 o 16 carácteres
+ * - Elegir si se quiere que tenga mayúsculas
+ * - Elegir si se quiere que tenga números
+ * - Elegir si se quiere que tenga simbolos
+ */
+public class vandresca {
+
+    private static final String LOWERCASE = "abcdefghijklmnopqrstuvwxyz";
+    private static final String UPPERCASE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    private static final String NUMBERS = "0123456789";
+    private static final String SYMBOLS = "!@#$%^&*()_+-=[]|,./?><";
+
+
+    public static class Params{
+        public Boolean hasLength16;
+        public Boolean hasUpperCase;
+        public Boolean hasNumbers;
+        public Boolean hasSymbols;
+    }
+
+    public static void main(String[] args) {
+        Params params = new Params();
+        params.hasLength16 = true;
+        params.hasUpperCase = true;
+        params.hasNumbers = true;
+        params.hasSymbols = true;
+        showPassword(generatePassword(params));
+    }
+
+    private static String generatePassword(Params params) {
+        String sourceChars = getSourceChars(params);
+        int length = (params.hasLength16)? 16 : 8;
+        String password = "";
+        for(int i=0; i<length; i++){
+            password += randomChar(sourceChars);
+        }
+        return password;
+    }
+    private static String getSourceChars(Params params){
+
+
+        StringBuilder sourceChars = new StringBuilder(LOWERCASE);
+        if(params.hasUpperCase){
+            sourceChars.append(UPPERCASE);
+        }
+        if(params.hasNumbers){
+            sourceChars.append(NUMBERS);
+        }
+        if(params.hasSymbols){
+            sourceChars.append(SYMBOLS);
+        }
+        List<String> source = Arrays.asList(sourceChars.toString());
+        Collections.shuffle(source);
+        return source.get(0);
+    }
+
+    private static String randomChar(String sourceChars){
+        Random rd = new Random();
+        int randomInt = rd.nextInt(sourceChars.length());
+        return String.valueOf(sourceChars.charAt(randomInt));
+    }
+
+    private static void showPassword(String password){
+        System.out.println(password);
+    }
+}
+