Having trouble with loop in java

I am trying to get my code to loop back to the beginning of the program after the user completes one of the options. I cannot seem to figure out how to get it to work properly. Here is my code so far

static Scanner console = new Scanner(System.in);

public static void main(String[] args) {
    // TODO Auto-generated method stub

    int num1;
    int num2;
    int num3;

    boolean opt1Done = false;
    System.out.println("Select your next step");
    System.out.println("1: Enter three numbers between 1 and 100.");
    System.out.println("2: Order your number in ascending order");
    System.out.println("3: Determine if the three inputs form a triangle");
    System.out.println("4: Exit");

    int answer = console.nextInt();
    num1 = console.nextInt();
    num2 = console.nextInt();
    num3 = console.nextInt();

    if (answer == 1) {
        //do whatever for option 1
        System.out.println("Enter a value for num1 between 1 and 100.");
        System.out.println("Enter a value for num2 between 1 and 100.");
        System.out.println("Enter a value for num3 between 1 and 100.");

        opt1Done = true;
  } else if (answer == 2) {
    if (opt1Done) {
            //...... do whatever to order the numbers
        int[] arraynum;
        arraynum = new int[3];

        arraynum[0] = num1;
        arraynum[1] = num2;
        arraynum[2] = num3;

        Arrays.sort(arraynum);

        int i;

        for (i=0; i < arraynum.length; i++) {
            System.out.println("num:" + arraynum[i]);
        }

        } else {
            System.out.println("you must complete Step 1 before Step 2");
        }
  } else if (answer == 3) {
    if (opt1Done) {
            //... do whatever to determine if triangle or not
            if (num1+num2>num3 && num1+num3>num2 && num2+num3>num1)
            {   
                System.out.print("TRIANGLE");
            }
            else
            {   
                System.out.print("NO TRIANGLE");
            }
        } else {
            System.out.println("you must complete Step 1 before Step 3");
        }
    }
}

}

Basically I need it so that after the user enters 2 and completes option 2, the program will then go back to the beginning and ask again to choose which option the user wants. How can I get this to work properly? Also if anything else is wrong with the code that I do not see please let me know. Thanks