CounterAlarmPanel Class

import java.util.*;

import java.awt.*;

class CounterAlarmPanel extends Panel

implements CounterObserver {

public CounterAlarmPanel() {counters = new Vector();}

// add counter with error-threshold

void add(Counter ctr, int err) {…}

public void paint(Graphics g) {...}

public void counterHasChanged(Counter ctr) {…}

Vector counters; // counter/error-threshold pairs

}

• Counter/error-threshold pairs maintained in helper class, CounterAlarm

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