Swim

import java.util.Scanner;
    
    public class swim
    {
    	public static void main( String[] args ) throws Exception
    	{
    		Scanner keyboard = new Scanner(System.in);
    
    		String swimmer1 = "GALLANT";
    		String swimmer2 = "GOOFUS ";
    
    		double minimumTemperature = 79.0; // degrees Fahrenheit
    		double currentTemperature;
    		double savedTemperature;
    		int swimTime;
    
    		System.out.print("What is the current water temperature? ");
    		currentTemperature = keyboard.nextDouble();
    		savedTemperature = currentTemperature; // saves a copy of this value so we can get it back later.
    
    		System.out.println( "\nOkay, so the current water temperature is " + currentTemperature + "F." );
    		System.out.println( swimmer1 + " approaches the lake...." );
    
    		swimTime = 0;
    		while ( currentTemperature >= minimumTemperature )
    		{
    			System.out.print( "\t" + swimmer1 + " swims for a bit." );
    			swimTime++;
    			System.out.println( " Swim time: " + swimTime + " min." );
    			Thread.sleep(600); // pauses for 600 milliseconds
    			currentTemperature -= 0.5; // subtracts 1/2 a degree from the water temperature
    			System.out.println( "\tThe current water temperature is now " + currentTemperature + "F." );
    		}
    
    		System.out.println( swimmer1 + " stops swimming. Total swim time: " + swimTime + " min." );
    
    		currentTemperature = savedTemperature; // restores original water temperature
    
    		System.out.println( "\nOkay, so the current water temperature is " + currentTemperature + "F." );
    		System.out.println( swimmer2 + " approaches the lake...." );
    
    		swimTime = 0;
    		do
    		{
    			System.out.print( "\t" + swimmer2 + " swims for a bit." );
    			swimTime++;
    			System.out.println( " Swim time: " + swimTime + " min." );
    			Thread.sleep(600);
    			currentTemperature -= 0.5;
    			System.out.println( "\tThe current water temperature is now " + currentTemperature + "F." );
    
    		} while ( currentTemperature >= minimumTemperature );
    
    		System.out.println( swimmer2 + " stops swimming. Total swim time: " + swimTime + " min." );
    	}
    }
    
    /// 1. They swim for the same amount of time.
    /// 2. Gallant does not swim because it's too cold, but Goofus swims for a minute before getting out.
    /// 3. Gallant checks the temp first.
    /// 4. Goofus doesn't check the water temp first.
    /// 5. A do-while loops is carried out one time automatically before the condition is checkes. The whils is only activated when considering whether the loop should be repeated.
    /// 6. The pre-test loop is a while loop because the test is doe before execution. The post-test loop is a do-while loop because execution happens before the test.
    
    

Picture of the output