Chapter 15 Lab 15.3: Using Timer and TimerTask To become familiar with using the

Question

Chapter 15 Lab 15.3: Using Timer and TimerTask To become familiar with using the Timer and TimerTask class. Write a class named Reminder that extends TimerTask Add a field of type String named message, and a constructor that initializes this field. Within the run() method, simply print out the message field using System out printin(). Write a class named TestReminder that contains main(). Within main(), instantiate a new Timer object. Within main(), instantiate three Reminder objects, each with a different message. Using the schedule() method of the Timer class that creates a single execution task, schedule your three Reminder objects with the Timer. Have the first Reminder scheduled immediately, the second reminder after 30 seconds, and the third reminder after 2 minutes. Save, compile, and run the TestReminder program. The three reminders should be displayed at the command prompt. You should have to wait 2 minutes before seeing the final reminder.

Explanation / Answer

public class Reminder extends java.util.TimerTask {

    private String message;

    Reminder(String message) {
        this.message = message;        
    }

    public void run() {
        System.out.println(this.message);       
    }
}

class TestReminder {
    public static void main(String[] args) {
        java.util.Timer timer = new java.util.Timer();
        System.out.println("Assigning Reminder Tasks");
        timer.schedule(new Reminder("one sec reminder"), 0, 1*1000);
        timer.schedule(new Reminder("thirty sec reminder"), 0, 1*30*1000);        
        timer.schedule(new Reminder("two minute reminder"), 0, 2*60*1000);
    }
} public class Reminder extends java.util.TimerTask {

    private String message;

    Reminder(String message) {
        this.message = message;        
    }

    public void run() {
        System.out.println(this.message);       
    }
}

class TestReminder {
    public static void main(String[] args) {
        java.util.Timer timer = new java.util.Timer();
        System.out.println("Assigning Reminder Tasks");
        timer.schedule(new Reminder("one sec reminder"), 0, 1*1000);
        timer.schedule(new Reminder("thirty sec reminder"), 0, 1*30*1000);        
        timer.schedule(new Reminder("two minute reminder"), 0, 2*60*1000);
    }
}

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