KaranPatelDev · KaranPatelDev · Oct 21, 2023
diff --git a/Password Generator/GeneratePassword.class b/Password Generator/GeneratePassword.class
diff --git a/Password Generator/GeneratePassword.java b/Password Generator/GeneratePassword.java
@@ -0,0 +1,113 @@
+import java.security.SecureRandom;
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+public class GeneratePassword {
+
+    public static void main(String args[]) {
+
+        String pass = generateSecurePassword();
+
+        System.out.println("Password generated by Custom Utility Method is:" + pass);
+
+    }
+
+    public static String generateSecurePassword() {
+
+        // generate a string having 2 numbers, 2 special chars, 2 upper case letters,
+        // and 2 lower case letters
+        Stream<Character> demoPassword = Stream.concat(getRandomNumbers(2),
+                Stream.concat(getRandomSpecialChars(2),
+                        Stream.concat(getRandomAlphabets(2, true), getRandomAlphabets(2, false))));
+
+        // create a list of Char that stores all the characters, numbers, and special
+        // characters
+        List<Character> listOfChar = demoPassword.collect(Collectors.toList());
+
+        // use shuffle() method of the Collections to shuffle the list elements
+        Collections.shuffle(listOfChar);
+
+        // generate a random string(secure password) by using list stream() method and
+        // collect() method
+        String password = listOfChar.stream()
+                .collect(StringBuilder::new, StringBuilder::append, StringBuilder::append)
+                .toString();
+
+        // return RandomStringGenerator password to the main() method
+        return password;
+    }
+
+    // create getRandomSpecialChars() method that returns a Stream of special chars
+    // of the specified length
+    public static Stream<Character> getRandomSpecialChars(int length) {
+
+        Stream<Character> specialCharsStream;
+
+        // create instance of SecureRandom
+        Random random = new SecureRandom();
+
+        // use ints() method of random to get IntStream of special chars of the
+        // specified length
+        IntStream specialChars = random.ints(length, 33, 45);
+        specialCharsStream = specialChars.mapToObj(data -> (char) data);
+
+        // return stream to the main() method
+        return specialCharsStream;
+    }
+
+    // create getRandomNumbers() method that returns a Stream of numbers of the
+    // specified length
+    public static Stream<Character> getRandomNumbers(int length) {
+
+        Stream<Character> numberStream;
+
+        // create instance of SecureRandom
+        Random random = new SecureRandom();
+
+        // use ints() method of random to get IntStream of number of the specified
+        // length
+        IntStream numberIntStream = random.ints(length, 48, 57);
+        numberStream = numberIntStream.mapToObj(data -> (char) data);
+
+        // return number stream to main() method
+        return numberStream;
+    }
+
+    // create getRandomAlphabets() method that returns either a stream of upper case
+    // chars or stream of lower case chars
+    // of the specified length based on the boolean variable check
+    public static Stream<Character> getRandomAlphabets(int length, boolean check) {
+
+        Stream<Character> lowerUpperStream;
+
+        // for lower case stream
+        if (check == true) {
+            // create instance of SecureRandom
+            Random random = new SecureRandom();
+
+            // use ints() method of random to get IntStream of lower case letters of the
+            // specified length
+            IntStream lCaseStream = random.ints(length, 'a', 'z');
+            lowerUpperStream = lCaseStream.mapToObj(data -> (char) data);
+        }
+        // for upper case stream
+        else {
+            // create instance of SecureRandom
+            Random random = new SecureRandom();
+
+            // use ints() method of random to get IntStream of upper case letters of the
+            // specified length
+            IntStream uCaseStream = random.ints(length, 'A', 'Z');
+            lowerUpperStream = uCaseStream.mapToObj(data -> (char) data);
+        }
+
+        // return lowerUpperStream to main() method
+        return lowerUpperStream;
+
+    }
+
+}