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Code

 ///Name: Conner Wygaerts
///Period: 6
///Project Name: CollatzSequence
///File Name: CollatzSequence.java
///Date Finished: 2/1/16

  import java.util.Scanner;

public class CollatzSequence
{
	public static void main( String[] args )
	{
		Scanner keyboard = new Scanner(System.in);
        
            int x, y, z;
            
            System.out.println("Enter three integers:");
            
            do
            {
                System.out.print("Side 1: ");
                x = keyboard.nextInt();
                
                if (x <= 0)
                    System.out.println(x + " is not greater than 0. Try again.");
            } while (x <= 0);
            
            do
            {
                System.out.print("Side 2: ");
                y = keyboard.nextInt();
                
                if (y < x)
                    System.out.println(y + " is smaller than " + x + ". Try again.");
            } while (y <= x);
            
            do
            {
                System.out.print("Side 3: ");
                z = keyboard.nextInt();
                
                if (z < y)
                    System.out.println(z + " is smaller than " + y + ". Try again.");
            } while (z <= y);
            
            System.out.println();
            
            System.out.println("Your three sides are " + x + " " + y + " " + z + ".");
            
            if ( z == Math.sqrt(x*x + y*y) )
                System.out.println("These sides *do* make a right triangle!");
            else
                System.out.println("NO! These sides do not make a right triangle!");
        }
    }
  

Picture of the output