The programming language is java. whats the code for each 6 questions for java

Write a method to work out the sum of the first n odd numbers Write a method that will add the first n even numbers. Write a method that prompts the user to print out the smallest of three given numbers Write a method that will work out the sum of the squares for the first n numbers Write a method that will display the 1, 8, 27, 64,. up to n and work out the sum for the first n sequence of numbers Write one program that will call methods from each of the above five questions