Reference no: EM132163002

Users are required to enter the correct passcode to start the application.

The system uses a scramble keypad with a randomly allocated set of numbers from 0 to 9.

The display shall show "Enter passcode" initially, and show an asterisk (*) for each number entered.

Upon pushing the "Enter" button, the system verifies the passcode.

If the passcode is correct, the system invokes a method called startApp() to start the application. Otherwise, it displays "Wrong passcode".

The "Clear" button shall clear the display. Assume that the following methods are available:

// return the passcode

public String getPasscode(){

//Random rnd = new Random();

//String passcode4digit = rnd.nextInt(10) + "" + rnd.nextInt(10) + "" + // rnd.nextInt(10) + "" + rnd.nextInt(10);

String passcode4digit ="7312";

return passcode4digit;

}

// Start the application public void startApp(){

System.out.println("Application started"); }

// Shuffle (Randomize) the given int array, e.g.,

// int[] numbers = {1, 2, 3, 4, 5};

// shuffleArray(numbers);

// randomize the elements

public void shuffleArray(int[] ar)

{

Random rnd = new Random();

for (int i = ar.length - 1; i > 0; i--) {

int index = rnd.nextInt(i + 1);

// Simple swap

int a = ar[index];

ar[index] = ar[i];

ar[i] = a;

}

}