BlueRedTower

public class BlueRedTower extends Tower {
	public BlueRedTower(){
		super();
		this.name = "Blue Red Tower";
	}
	public int attackJelly() {
		int pointValue = 1;
		return pointValue;
	}
	
}

BlueTower

public class BlueTower extends Tower {
	public BlueTower(){
		super();
		this.name = "Blue Tower";
	}
public int attackJelly() {
		int pointValue = 1;
		return pointValue;
	}
}

RedTower

public class RedTower extends Tower {
	public RedTower(){
		super();
		this.name = "Red Tower";
	}

	public int attackJelly() {
		int pointValue = 0;
		return pointValue;
	}
}

Tower

import java.awt.*;
public abstract class Tower {
	public int pointValue;
	public static final int LEVEL_1 = 1;
	public static final int LEVEL_2 = 2;
	public static final int LEVEL_3 = 3;
	public static final int LEVEL_4 = 4;
	
	protected int level;
	protected String name;
	
	public Tower(){
		this.level = LEVEL_1;
		name = "Generic Tower";
	}
	
	
	public void increaseLevel(){
		if (this.level != LEVEL_4) this.level++;
		else System.out.println("Tower at maximum level");
	}

	public void attackJelly(int pointValue){
		if (pointValue > 1) {
			System.out.println(this.name + " attacks Jelly for " + pointValue + " points damage.");
			System.out.println();
		}
		else if (pointValue == 1) {
			System.out.println(this.name + " attacks Jelly for " + pointValue + " point damage.");
			System.out.println();
		}
		else {
			System.out.println(this.name + " did not effectively attack Jelly.");
			System.out.println();
		}
	}
		

	/*public int compareTo(Tower arg0) {
		if (this.level > arg0.level) return 1;
		else return -1;
	}
*/
}

TowerTest

public class TowerTest {
	public static void main (String[] args){
		
		BlueRedTower brt = new BlueRedTower();
		brt.attackJelly(1);
		BlueTower bt = new BlueTower();
		bt.attackJelly(2);
		bt.attackJelly(2);
		RedTower rt = new RedTower();
		rt.attackJelly(2);	
	
		
	}
}