generateRandomPassword()

Step 1: Importing Necessary Libraries

Firstly, you'll need to import the necessary libraries to generate a random password. These include the Random class to generate random numbers, and the StringBuilder class to build the password.

import java.util.Random;

Step 2: Declaring Variables

Now we declare a string containing all possible characters and digits to be included in the password, and an object of Random class.

Random rand = new Random();
String upperAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
String lowerAlphabet = "abcdefghijklmnopqrstuvwxyz";
String numbers = "0123456789";

Step 3: Building Password

Let's build the password. Use StringBuilder to store characters sequentially. We also prepare a String 'all' that contains all sorts of characters to be used in password.

StringBuilder password = new StringBuilder();
String all = upperAlphabet + lowerAlphabet + numbers;

Step 4: Generating Random Password

Finally, we add random characters from 'all' into our StringBuilder object 'password'. Each character is chosen based on random index.

int length = 10;  //Length of password
for (int i = 0; i < length; i++) {
  int randIndex = rand.nextInt(all.length());
  password.append(all.charAt(randIndex));
}

Step 5: Returning and Printing Password

We convert the generated password from StringBuilder to String and return it.

String finalPassword = password.toString();
System.out.println(finalPassword);

In Conclusion, we have generated a random password using Java. Below is the full code for the function.

import java.util.Random;

public class Main {
  public static void main(String[] args) {
    Random rand = new Random();
    String upperAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    String lowerAlphabet = "abcdefghijklmnopqrstuvwxyz";
    String numbers = "0123456789";
    StringBuilder password = new StringBuilder();
    String all = upperAlphabet + lowerAlphabet + numbers;
    int length = 10;  //Length of password
    for (int i = 0; i < length; i++) {
      int randIndex = rand.nextInt(all.length());
      password.append(all.charAt(randIndex));
    }
    String finalPassword = password.toString();
    System.out.println(finalPassword);
  }
}