password generator snippet

Author: Mcbencrafter

snippets/java/string-manipulation/password-generator.md

@@ -0,0 +1,38 @@
+---
+title: Password Generator
+description: Generates a random string with specified length and character set, including options for letters, numbers, and special characters 
+author: Mcbencrafter
+tags: string,password,generator,security,random,token
+---
+
+```java
+public static String randomString(int length, boolean useLetters, boolean useNumbers, boolean useSpecialCharacters) {
+    String characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+    String numbers = "0123456789";
+    String specialCharacters = "!@#$%^&*()_+-=[]{}|;:,.<>?";
+    
+    String allowedCharacters = "";
+    
+    if (useLetters)
+        allowedCharacters += characters;
+
+    if (useNumbers)
+        allowedCharacters += numbers;
+
+    if (useSpecialCharacters)
+        allowedCharacters += specialCharacters;
+
+    SecureRandom random = new SecureRandom();
+    StringBuilder result = new StringBuilder(length);
+
+    for (int i = 0; i < length; i++) {
+        int index = random.nextInt(allowedCharacters.length());
+        result.append(allowedCharacters.charAt(index));
+    }
+
+    return result.toString();
+}
+
+// Usage:
+System.out.println(randomString(10, true, true, false)); // Random string containing letters, numbers but no special characters with 10 characters
+```