how can i make this class generateAvg return 0 before getting the average using

Question

how can i make this class generateAvg return 0 before getting the average using observable?

make it initially have no average

3+ import java.util.Observable;. 6 public class generateAvg extends Observable { private int seed; double average = 0; private Random r = new Random(); 10 126 13 14 15 public generateAvg(int seed) { this. seed = seed; r.setSeed(this.seed); } 16 176 18 public double getAvg() { average = r.nextDouble()*10.0; return average; } 19 20 /** * Updates radiation, changes the state to true, and notifies all observers of * the change. 25 266 27 public void readRadiation() { setChanged(); notifyObservers(getAvg()); } 28 29 30 } }

Explanation / Answer

import java.util.Observable; import java.util.Observer; import java.util.Random; public class generateAvg extends Observable { private int seed; double average = 0; private Random r = new Random(); public generateAvg(int seed) { this.seed = seed; } // as soon as an observer is added, notify the observer with 0 @Override public synchronized void addObserver(Observer o) { super.addObserver(o); o.update(this, 0); } }

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