Beginner method aparently runs more than once

Question

Ok, first of all I own up to this being my school homework. I am almost finished but I have the unexpected result of my player being hit twice as predicted by happy_hippo in prior post. Here are the two classes. Basically the method fired_at() in Player seems to be running twice?
Any help is appreciated...
public class GameEngine
public static void main( String args[] )
Player myPlayer = new Player();
myPlayer.Player("Michael Stramel");
if (myPlayer.fired_at() == 100)
     System.out.printf("%s was not hit and has 100 health.", myPlayer.getplayerName());
else
     System.out.printf("%s was hit and has %.2f health.", myPlayer.getplayerName(), myPlayer.fired_at());
import java.util.Random;
public class Player
     private String playerName;  //name of player
     private float playerHealth;  //health of player
public void Player ( String name )
     playerName = name;
     playerHealth = 100;
public void setplayerName( String name )  //method to set the player name
     playerName = name; // store the player name
     } //end method setplayerName
//public void setplayerHealth( String name )  //method to set the player health
//     playerName = name; // store the player health
//     } //end method setplayerHealth
public String getplayerName()  //method to retrieve the player name
     return playerName;
     }//end method getplayerName
//public float getplayerHealth()  //method to retrieve the player health
//     return playerHealth;
//     }//end method getplayerHealth
public float fired_at()
     Random randomHit = new Random();
     boolean x = randomHit.nextBoolean();
          if (playerHealth >= 20)                                    //Random boolean here   
               {                                                            //If boolean = true & if player
               //if (x == true)                                             //health >= 20,
               //     {                                                       //(playerHealth = playerHealth - 20)
               playerHealth = (playerHealth - 20);
          //else
               //playerHealth = 0;
          return playerHealth;
}

Answer 1

This is (sort of) how I would rewrite your code, I have tried to keep your original variable names where possible.
I would however consider renaming:-
fired_at() -> fireAt()
getplayerName() -> getPlayerName() -(or possibly)-> getName()
getplayerHealth() -> getPlayerHealth() -(or possibly)-> getHealth()
setplayerName() -> see convention above
setplayerHealth() -> see convention above
be consistent!!! fireAt() versus getplayerName()
And I think you need to comment A LOT LESS! Why label the end of a method? I don't think there is any need to label get/set methods (although you would for Javadoc)
Trick:
public Player(String playerName)
   //assigns the local variable (passed in) to the class variable
   this.playerName = playerName; 
var = var - x;
//is equivalent to
var -= x;
public class GameEngine
   public static void main( String args[] )
      Player myPlayer = new Player("Michael Stramel");
      myPlayer.fired_at();
      if (myPlayer.getplayerHealth() == 100)
         System.out.printf("%s was not hit and has 100 health.", myPlayer.getplayerName());
      else
         System.out.printf("%s was hit and has %.2f health.", myPlayer.getplayerName(), myPlayer.getplayerHealth());
import java.util.Random;
public class Player
   private Random rnd;
   private String playerName;
   private int playerHealth;
   //NB: removed void, this is now a constructor
   public void Player ( String name )
      playerName = name;
      playerHealth = 100;
      rnd = new Random();
// NB: Do you need this method? Do you really want to be able to change
// the name of a player once they have been created??
// public void setplayerName( String name )
//    playerName = name;
//    //again, I would use the this. trick (above)
   public String getplayerName()
      return playerName;
   public int getplayerHealth()
      return playerHealth;
   //note: void, not int (or float)
   public void fired_at()
      if (playerHealth >= 20)
         if (rnd.nextBoolean())
            playerHealth -= 20;
      else
         playerHealth = 0;
}