Write a Java method to check whether a string is a valid password. Password rules: * A password must have at least eight characters. * A password consists of only letters and digits. * A password must contain at least two digits and at least two letters. Enter the password by the user. If the password is not valid, the user continues to enter the password until the password is valid. You can write methods that can control number of digits and letters.

Exercise 1Create a method that randomly select a letter in the alphabet.java

Random Numbers: Most computer programs do the same thing every time they run; programs like that are called deterministic. Usually, determinism is a good thing, since we expect the same calculation to yield the same result. But for some applications, we want the computer to be unpredictable. Games are an obvious example, but there are many others, like scientific simulations. We have already seen java.util.Random, which generates pseudorandom numbers. The method nextInt takes an integer argument, n, and returns a random integer between 0 and n - 1. Assignment: For this assignment you will write a program in java to simulate a guessing game. Your program will generate a random number in a certain range (let the user define the range) and ask the user to guess what number it is. Give the user a certain number of tries while you narrow down the possibilities. For example, let's say the number generated is 67 and the user has 5 tries, this could be your program's output: This is a guessing…

Java programming The US dollar = 0.82 Euros and 1.21 Canadian dollars.Write the following methods to convert US dollars to Euros and to Canadiandollars: *** A method prompting the user to select an option (to convert to Euros orto Canadian dollars) and returns the option to the main method.