Java Methods code. Someone help please

[bill pahceco]

Objective

You will write a program called Methods.java. It will define a number of public static methods, as described below.
Required Methods

add
takes two doubles, returns their sum
max
takes two doubles, returns the larger value (3.0 is larger than -10.0)
rev
takes a String, returns the reversed String ("Hi, Bob" reversed is "boB ,iH")
pi
takes nothing, returns exactly 3.14159
store
takes a double, remembers it, returns nothing
recall
takes nothing, returns the last double from store
even
takes an int, returns true or false if it’s even or not
iota
takes an int (let’s call it n), returns an array of n ints containing 1001, 2002, 3003, ..., n*1001.
Assume that n > 0.
sum
takes an array of doubles, returns their sum
mean
takes an array of doubles, returns their mean (total divided by how many). It must call the sum method to calculate the total. Assume that the array is non-empty.




Testing

We will not call your main. In fact, you don’t even have to provide a main, though you certainly should use one for testing. You must provide a class called Methods that contains the methods described above. We will call your functions in various ways, from our own code. Our testing will not be limited to the code provided below.

If you don’t manage to write all of the methods, write what you can, and get points for what you got done.
Test Code

Here’s a main that you might find useful to test your methods:

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[] a;
        boolean b;
        int n;
        double d;
        String s;

        for (;;) {
            System.out.println("Enter command and arguments");
            String op = scan.next();
            if (op.equals("quit"))
                break;
            else if (op.equals("add")) {
                d = add(scan.nextDouble(), scan.nextDouble());
                System.out.println(d);
            }
            else if (op.equals("max")) {
                d = max(scan.nextDouble(), scan.nextDouble());
                System.out.println(d);
            }
            else if (op.equals("rev")) {
                s = rev(scan.nextLine());
                System.out.println(s);
            }
            else if (op.equals("pi")) {
                d = pi();
                System.out.println(d);
            }
            else if (op.equals("store")) {
                store(scan.nextDouble());
            }
            else if (op.equals("recall")) {
                d = recall();
                System.out.println(d);
            }
            else if (op.equals("even")) {
                b = even(scan.nextInt());
                System.out.println(b);
            }
            else if (op.equals("iota")) {
                a = iota(scan.nextInt());
                for (int i=0; i<a.length; i++)
                        System.out.print(a[i] + " ");
                System.out.println();
            }
            else if (op.equals("sum")) {
                scan.skip(" ");
                s = scan.nextLine();
                int count = s.split(" ").length;
                Scanner linescan = new Scanner(s);
                double[] data = new double[count];
                for (int i=0; i<data.length; i++)
                        data[i] = linescan.nextDouble();
                d = sum(data);
                System.out.println(d);
            }
            else if (op.equals("mean")) {
                scan.skip(" ");
                s = scan.nextLine();
                int count = s.split(" ").length;
                Scanner linescan = new Scanner(s);
                double[] data = new double[count];
                for (int i=0; i<data.length; i++)
                        data[i] = linescan.nextDouble();
                d = mean(data);
                System.out.println(d);
            }
            else {
                System.out.println("Invalid command: " + op);
            }
        }
    }

If someone who actually likes programming that wants to do this assignment for me then you should
Thanks in advanced

[bill pahceco]

Okay i've done some of them. Im not sure how to do the methods:

rev
store
recall
iota
sum
mean

This is what I have so far:

package Methods;

import java.util.Scanner;

public class Methods {
	
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int[] a;
        boolean b;
        int n;
        double d;
        String s;

        for (;;) {
            System.out.println("Enter command and arguments");
            String op = scan.next();
            if (op.equals("quit"))
                break;
            else if (op.equals("add")) {
                d = add(scan.nextDouble(), scan.nextDouble());
                System.out.println(d);
            }
            else if (op.equals("max")) {
                d = max(scan.nextDouble(), scan.nextDouble());
                System.out.println(d);
            }
            else if (op.equals("rev")) {
                s = rev(scan.nextLine());
                System.out.println(s);
            }
            else if (op.equals("pi")) {
                d = pi();
                System.out.println(d);
            }
            else if (op.equals("store")) {
                store(scan.nextDouble());
            }
            else if (op.equals("recall")) {
                d = recall();
                System.out.println(d);
            }
            else if (op.equals("even")) {
                b = even(scan.nextInt());
                System.out.println(b);
            }
            else if (op.equals("iota")) {
                a = iota(scan.nextInt());
                for (int i=0; i<a.length; i++)
                        System.out.print(a[i] + " ");
                System.out.println();
            }
            else if (op.equals("sum")) {
                scan.skip(" ");
                s = scan.nextLine();
                int count = s.split(" ").length;
                Scanner linescan = new Scanner(s);
                double[] data = new double[count];
                for (int i=0; i<data.length; i++)
                        data[i] = linescan.nextDouble();
                d = sum(data);
                System.out.println(d);
            }
            else if (op.equals("mean")) {
                scan.skip(" ");
                s = scan.nextLine();
                int count = s.split(" ").length;
                Scanner linescan = new Scanner(s);
                double[] data = new double[count];
                for (int i=0; i<data.length; i++)
                        data[i] = linescan.nextDouble();
                d = mean(data);
                System.out.println(d);
            }
            else {
                System.out.println("Invalid command: " + op);
            }
        }
    }

	private static double recall() {
		// TODO Auto-generated method stub
		return 0;
	}

	public static double mean(double[] data) {
		// TODO Auto-generated method stub
		return 0;
	}

	public static double sum(double[] data) {
		// TODO Auto-generated method stub
		return 0;
	}

	public static int[] iota(int nextInt) {
		int n = nextInt;
		int[] a = new int[n];
		return null;
	}

	public static boolean even(int nextInt) {
		if (nextInt % 2 == 0)
			return true;
		else
			return false;
	}

	public static double store(double nextDouble) {
		double d = nextDouble;
		return d;
		
	}

	public static double add(double nextDouble, double nextDouble2) {
		double d = nextDouble + nextDouble2;
		return d;
	}

	public static double max(double nextDouble, double nextDouble2) {
		if (nextDouble > nextDouble2)
			return nextDouble;
		else	
			return nextDouble2;
	}

	public static String rev(String nextLine) {
		Scanner scan = new Scanner(System.in);
		String rev = scan.nextLine();
		for(int i=rev.length()-1; i > 0; i--)
			System.out.print(i);
		String s = i;
		return s;
	}

	public static double pi() {
		
		return 3.14159;
	}

}