In Java, I have created a program which can generate passwords. Currently the program can generate...
In Java, I have created a program which can generate passwords. Currently the program can generate a password through a menu system of which characters to use. To complete the project, I need a system which allows the user to generate another password after the first password is created. I also need a method to check whether or not the password is complex by checking if the generated password has 3 or more character types and then displaying whether or not the password generated is complex. Code below.
package passwordgenerator;
import java.security.SecureRandom;
import java.util.Scanner;
/**
*
* @author Ben Ney
*/
public class PasswordGenerator {
private static final SecureRandom random = new SecureRandom();
/** different dictionaries used */
private static final String ALPHA_CAPS =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static final String ALPHA =
"abcdefghijklmnopqrstuvwxyz";
private static final String NUMERIC = "0123456789";
private static final String SPECIAL_CHARS =
"!@#$%^&*_=+-/";
public static String generatePassword(int len)
{
Scanner scnr = new Scanner(System.in);
System.out.println("[1] Only Lowercase Letters\n[2] Only
Uppercase Letters\n[3] Only Numbers\n[4] Only Special
Characters\n[5] Lowercase & Uppercase\n[6] Lowercase &
Numbers\n"
+ "[7] Lowercase & Sepcial Characters\n[8] Uppercase &
Numbers\n[9] Uppercase & Special Characters\n[10] Numbers &
Special Characters\n[11] Lowercase, Uppercase, &
Numbers\n"
+ "[12] Lowercase, Uppercase, & Special Characters\n[13]
Lowercase, Numbers, & Special Characters\n[14] Uppercase,
Numbers, Special Characters\n[15] All Characters\n[16]
Exit");
int menuOption = scnr.nextInt();
while (menuOption != 16) {
if (menuOption == 1) {
String dic1 = ALPHA;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic1.length());
result += dic1.charAt(index);
}
return result;
}
else if (menuOption == 2) {
String dic2 = ALPHA_CAPS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic2.length());
result += dic2.charAt(index);
}
return result;
}
else if (menuOption == 3) {
String dic3 = NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic3.length());
result += dic3.charAt(index);
}
return result;
}
else if (menuOption == 4) {
String dic4 = SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic4.length());
result += dic4.charAt(index);
}
return result;
}
else if (menuOption == 5) {
String dic5 = ALPHA+ALPHA_CAPS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic5.length());
result += dic5.charAt(index);
}
return result;
}
else if (menuOption == 6) {
String dic6 = ALPHA+NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic6.length());
result += dic6.charAt(index);
}
return result;
}
else if (menuOption == 7) {
String dic7 = ALPHA+SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic7.length());
result += dic7.charAt(index);
}
return result;
}
else if (menuOption == 8) {
String dic8 = ALPHA_CAPS+NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic8.length());
result += dic8.charAt(index);
}
return result;
}
else if (menuOption == 9) {
String dic9 = ALPHA_CAPS+SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic9.length());
result += dic9.charAt(index);
}
return result;
}
else if (menuOption == 10) {
String dic10 = NUMERIC+SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic10.length());
result += dic10.charAt(index);
}
return result;
}
else if (menuOption == 11) {
String dic11 = ALPHA+ALPHA_CAPS+NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic11.length());
result += dic11.charAt(index);
}
return result;
}
else if (menuOption == 12) {
String dic12 = ALPHA+ALPHA_CAPS+SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic12.length());
result += dic12.charAt(index);
}
return result;
}
else if (menuOption == 13) {
String dic13 = ALPHA+NUMERIC+SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic13.length());
result += dic13.charAt(index);
}
return result;
}
else if (menuOption == 14) {
String dic14 = ALPHA_CAPS+NUMERIC+SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic14.length());
result += dic14.charAt(index);
}
return result;
}
else if (menuOption == 15) {
String dic15 = ALPHA+ALPHA_CAPS+NUMERIC+SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic15.length());
result += dic15.charAt(index);
}
return result;
}
else {
System.out.println("Wrong option entered");
}
System.out.println("[1] Only Lowercase Letters\n[2] Only Uppercase
Letters\n[3] Only Numbers\n[4] Only Special Characters\n[5]
Lowercase & Uppercase\n[6] Lowercase & Numbers\n"
+ "[7] Lowercase & Sepcial Characters\n[8] Uppercase &
Numbers\n[9] Uppercase & Special Characters\n[10] Numbers &
Special Characters\n[11] Lowercase, Uppercase, &
Numbers\n"
+ "[12] Lowercase, Uppercase, & Special Characters\n[13]
Lowercase, Numbers, & Special Characters\n[14] Uppercase,
Numbers, Special Characters\n[15] All Characters\n[16]
Exit");
menuOption = scnr.nextInt();
}
return null;
}
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
int length;
//Prompts user to enter length of passoword
System.out.print("Enter the length of the password: ");
//Uses next int as password length
length = scnr.nextInt();
System.out.println("Your password is :
"+generatePassword(length));
}
}
Homework Answers
Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks
// PasswordGenerator.java
package passwordgenerator;
import java.security.SecureRandom;
import java.util.Scanner;
/**
*
* @author Ben Ney
*/
public class PasswordGenerator {
private static final SecureRandom random = new SecureRandom();
/** different dictionaries used */
private static final String ALPHA_CAPS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
private static final String ALPHA = "abcdefghijklmnopqrstuvwxyz";
private static final String NUMERIC = "0123456789";
private static final String SPECIAL_CHARS = "!@#$%^&*_=+-/";
public static String generatePassword(int len) {
Scanner scnr = new Scanner(System.in);
System.out
.println("[1] Only Lowercase Letters\n[2] Only Uppercase Letters\n[3] Only Numbers\n[4] Only Special Characters\n[5] Lowercase & Uppercase\n[6] Lowercase & Numbers\n"
+ "[7] Lowercase & Sepcial Characters\n[8] Uppercase & Numbers\n[9] Uppercase & Special Characters\n[10] Numbers & Special Characters\n[11] Lowercase, Uppercase, & Numbers\n"
+ "[12] Lowercase, Uppercase, & Special Characters\n[13] Lowercase, Numbers, & Special Characters\n[14] Uppercase, Numbers, Special Characters\n[15] All Characters\n[16] Exit");
int menuOption = scnr.nextInt();
while (menuOption != 16) {
if (menuOption == 1) {
String dic1 = ALPHA;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic1.length());
result += dic1.charAt(index);
}
return result;
} else if (menuOption == 2) {
String dic2 = ALPHA_CAPS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic2.length());
result += dic2.charAt(index);
}
return result;
} else if (menuOption == 3) {
String dic3 = NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic3.length());
result += dic3.charAt(index);
}
return result;
} else if (menuOption == 4) {
String dic4 = SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic4.length());
result += dic4.charAt(index);
}
return result;
} else if (menuOption == 5) {
String dic5 = ALPHA + ALPHA_CAPS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic5.length());
result += dic5.charAt(index);
}
return result;
} else if (menuOption == 6) {
String dic6 = ALPHA + NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic6.length());
result += dic6.charAt(index);
}
return result;
} else if (menuOption == 7) {
String dic7 = ALPHA + SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic7.length());
result += dic7.charAt(index);
}
return result;
} else if (menuOption == 8) {
String dic8 = ALPHA_CAPS + NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic8.length());
result += dic8.charAt(index);
}
return result;
} else if (menuOption == 9) {
String dic9 = ALPHA_CAPS + SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic9.length());
result += dic9.charAt(index);
}
return result;
} else if (menuOption == 10) {
String dic10 = NUMERIC + SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic10.length());
result += dic10.charAt(index);
}
return result;
} else if (menuOption == 11) {
String dic11 = ALPHA + ALPHA_CAPS + NUMERIC;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic11.length());
result += dic11.charAt(index);
}
return result;
} else if (menuOption == 12) {
String dic12 = ALPHA + ALPHA_CAPS + SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic12.length());
result += dic12.charAt(index);
}
return result;
} else if (menuOption == 13) {
String dic13 = ALPHA + NUMERIC + SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic13.length());
result += dic13.charAt(index);
}
return result;
} else if (menuOption == 14) {
String dic14 = ALPHA_CAPS + NUMERIC + SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic14.length());
result += dic14.charAt(index);
}
return result;
} else if (menuOption == 15) {
String dic15 = ALPHA + ALPHA_CAPS + NUMERIC + SPECIAL_CHARS;
String result = "";
for (int i = 0; i < len; i++) {
int index = random.nextInt(dic15.length());
result += dic15.charAt(index);
}
return result;
} else {
System.out.println("Wrong option entered");
}
System.out
.println("[1] Only Lowercase Letters\n[2] Only Uppercase Letters\n[3] Only Numbers\n[4] Only Special Characters\n[5] Lowercase & Uppercase\n[6] Lowercase & Numbers\n"
+ "[7] Lowercase & Sepcial Characters\n[8] Uppercase & Numbers\n[9] Uppercase & Special Characters\n[10] Numbers & Special Characters\n[11] Lowercase, Uppercase, & Numbers\n"
+ "[12] Lowercase, Uppercase, & Special Characters\n[13] Lowercase, Numbers, & Special Characters\n[14] Uppercase, Numbers, Special Characters\n[15] All Characters\n[16] Exit");
menuOption = scnr.nextInt();
}
return null;
}
// method to check if a password is complex or not
public static boolean isComplex(String password) {
// number of unique character types found
int uniqueTypes = 0;
// flags to check whichever characters are found
boolean alphaFound = false, alphaCapsFound = false, numericFound = false, specialFound = false;
// looping through the password
for (int i = 0; i < password.length(); i++) {
// checking if ALPHA_CAPS contain the current character
if (ALPHA_CAPS.contains("" + password.charAt(i))) {
// if not already found, making alphaCapsFound true and
// incrementing count of unique types
if (!alphaCapsFound) {
alphaCapsFound = true;
uniqueTypes++;
}
}
// doing the same for other types too
if (ALPHA.contains("" + password.charAt(i))) {
if (!alphaFound) {
alphaFound = true;
uniqueTypes++;
}
}
if (NUMERIC.contains("" + password.charAt(i))) {
if (!numericFound) {
numericFound = true;
uniqueTypes++;
}
}
if (SPECIAL_CHARS.contains("" + password.charAt(i))) {
if (!specialFound) {
specialFound = true;
uniqueTypes++;
}
}
// at the end of a loop, if uniqueTypes is 3 or greater, then the
// password is complex
if (uniqueTypes >= 3) {
return true;
}
}
// if the program reach here, that means the password is not complex
return false;
}
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
String ch = "y", pass;
int length;
// looping
do {
// Prompts user to enter length of passoword
System.out.print("Enter the length of the password: ");
// Uses next int as password length
length = scnr.nextInt();
// generating password
pass = generatePassword(length);
// displaying it
System.out.println("Your password is : " + pass);
// checking if password is complex or not using the isComplex
// method, displaying it using ternary operator
// ternary operator is in the format condition?statement1:statement2
// if condition is true, statement 1 is returned/executed, else
// statement2
System.out.println("The password is "
+ (isComplex(pass) ? "complex" : "not complex"));
//asking if user wants to continue
System.out.print("\nDo you want to try another? (y/n) ");
ch = scnr.next();
} while (ch.equalsIgnoreCase("y"));
scnr.close();
}
}
/*OUTPUT*/
Enter the length of the password: 5
[1] Only Lowercase Letters
[2] Only Uppercase Letters
[3] Only Numbers
[4] Only Special Characters
[5] Lowercase & Uppercase
[6] Lowercase & Numbers
[7] Lowercase & Sepcial Characters
[8] Uppercase & Numbers
[9] Uppercase & Special Characters
[10] Numbers & Special Characters
[11] Lowercase, Uppercase, & Numbers
[12] Lowercase, Uppercase, & Special Characters
[13] Lowercase, Numbers, & Special Characters
[14] Uppercase, Numbers, Special Characters
[15] All Characters
[16] Exit
15
Your password is : 19Jfv
The password is complex
Do you want to try another? (y/n) y
Enter the length of the password: 10
[1] Only Lowercase Letters
[2] Only Uppercase Letters
[3] Only Numbers
[4] Only Special Characters
[5] Lowercase & Uppercase
[6] Lowercase & Numbers
[7] Lowercase & Sepcial Characters
[8] Uppercase & Numbers
[9] Uppercase & Special Characters
[10] Numbers & Special Characters
[11] Lowercase, Uppercase, & Numbers
[12] Lowercase, Uppercase, & Special Characters
[13] Lowercase, Numbers, & Special Characters
[14] Uppercase, Numbers, Special Characters
[15] All Characters
[16] Exit
5
Your password is : mpWgtyYXxz
The password is not complex
Do you want to try another? (y/n) y
Enter the length of the password: 20
[1] Only Lowercase Letters
[2] Only Uppercase Letters
[3] Only Numbers
[4] Only Special Characters
[5] Lowercase & Uppercase
[6] Lowercase & Numbers
[7] Lowercase & Sepcial Characters
[8] Uppercase & Numbers
[9] Uppercase & Special Characters
[10] Numbers & Special Characters
[11] Lowercase, Uppercase, & Numbers
[12] Lowercase, Uppercase, & Special Characters
[13] Lowercase, Numbers, & Special Characters
[14] Uppercase, Numbers, Special Characters
[15] All Characters
[16] Exit
14
Your password is : *D0B@LUR!*2G#-4WY*VG
The password is complex
Do you want to try another? (y/n) n
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