Looking For Feedback On My Program

Howdy!

I'm looking for feedback on my simple fighting program. It runs just fine and I don't see any bugs, so I'm looking for feedback on what I could've done to make it less verbose, more readable, and just generally want to hear any advice you guys have to improve.
I have a feeling that there is a much easier way to implement a structure that avoids displaying a negative health value rather than all those if/else statements...

I will post all of the classes in their entirety:

FightTest.java:

//automated fighting program

public class FightTest {

public static void main(String[] args){
		
		Boxer tyson = new Boxer();
		Ninja theKid = new Ninja();
		
		//round may be later used to calculate win-loss ratio 
		//for now however, variable "round" serves little to no purpose
		int round = 1;
		int ninjaHealth = theKid.getHealth();
		int boxerHealth = tyson.getHealth();
		
		System.out.println("The Fighters Enter The Arena...\n");
		System.out.println("Ninja: " + ninjaHealth);
		System.out.println("Boxer: " + boxerHealth );
		System.out.println();
		
		
		while(ninjaHealth > 0 || boxerHealth > 0){
			
			System.out.println("Round: " + round + "...FIGHT!\n");
			System.out.println("The boxer punches...");
			ninjaHealth -= tyson.getHit();
			System.out.println("The ninja chops...");
			boxerHealth -= theKid.getHit();
			round++;
			
			
			//fighting will continue...this displays health
			if(ninjaHealth > 0 && boxerHealth > 0){
				System.out.println("Ninja Health: " + ninjaHealth);
				System.out.println("Boxer Health: " + boxerHealth);
				System.out.println("\n\n\n");
			}
			//else fighting will not continue
			//avoids displaying a negative value of health for the ninja and resets to 0
			else if(ninjaHealth <= 0 && boxerHealth > 0){
				ninjaHealth = 0;
				
				System.out.println("Ninja Health: " + ninjaHealth);
				System.out.println("Boxer Health: " + boxerHealth);
				System.out.println("\n\n\nThe Ninja Lost the Fight");
				break;
			}
			//else fighting will not continue
			//avoids displaying a negative value of health for the boxer and resets to 0
			else if(ninjaHealth > 0 && boxerHealth <= 0){
				boxerHealth = 0;
				
				System.out.println("Boxer Health: " + boxerHealth);
				System.out.println("Ninja Health: " + ninjaHealth);
				System.out.println("\n\n\nThe Boxer Lost the Fight");
				break;
			}
			//catches if both fighters have a negative health value and resets to 0
			else if(ninjaHealth <=0 && boxerHealth <= 0){
				boxerHealth = 0;
				ninjaHealth = 0;
				
				System.out.println("\n\n\nBOTH FIGHTERS DOWN!!");
			}
			//just in case...
			else{
				System.out.println("\n\n\nI don't know what happened");
			}
			
		}	
	}
	
}

Boxer.java:

Ninja.java

Some sample output(with many of the rounds cut out so you guys don't kill me :S):

The code is good. Three things I can think of to improve:

1) Change "else if(ninjaHealth <=0 && boxerHealth <= 0)" to "else" and remove the else that says the code shouldn't get there. The if/else blocks are mutually exclusive so you can just end with an else and make the extra one impossible.

2) Add a helper method the outputs the boxer health, ninja health and a message so there isn't code all over that looks like:

Instead you would have:

This makes the main logic easier to read and removes some repetition.

3) The Boxer and Ninja classes are the same except for the value. You could have a generic Fighter class that takes this value as a constructor. Or create subclasses of that generic Fighter class to supply that value.