Thread loop - Extending Thread Class Java

Question

I need to write an Application that extends the Thread class. My class accepts an integer(i.e. 100) when it is instantiated. (MyThread myt = new MyThread(100); ) This integer number will be the number of times that this class loops and prints a message. The message should read “The Thread is running… 100”. The 100 would be whatever number I passed into the constructor. If the number was 150, then the output should read “ The Thread is running… 100”. I should use a main method to test this class. In the main I will start 2 Threads, one Thread with 150 and one Thread with 200. I don't need to use the sleep() method for this code.

I already wrote a code, but I'm confused. Should my message be printed 100 times? I'm not sure if my code meets all requisites. I should also implement this code changing this class to use the Runnable Interface instead of Thread class

public class MyThread extends Thread {

    private int numtimes;

    public MyThread(int numtimes) {
        this.numbtimes = numbtimes;

    }

    public void run() {

        for (int i = 0; i < numbtimes; i++) {
            System.out.println("Thread Running..." + numbtimes);

        }
    }

    public static void main(String[] args) {

        MyThread mytr1 = new MyThread(150);
        mytr1.start();

        MyThread mytr2 = new MyThread(200);
        mytr2.start();
    }

}

Is that what was asked? How would you do using Runnable Interface?

If the number was 150, then the output should read “ The Thread is running… 100” - That's strange — Scary Wombat
– Scary Wombat, Commented Jun 27, 2019 at 1:13
Should my message be printed 100 times? yes/no/ask your teacher — Scary Wombat
– Scary Wombat, Commented Jun 27, 2019 at 1:15
finally,in this trivial example without a sleep, the first thread will consume all cpu and finish before the second one begins — Scary Wombat
– Scary Wombat, Commented Jun 27, 2019 at 1:16
Yes, I used the 100 because the example was using this number... The hypothesis explanation was considering the number was 100. Of course I asked him, but he didn't answer. That's why I'm asking here. — Monique Sullivan
– Monique Sullivan, Commented Jun 27, 2019 at 1:46
but he didn't answer. - I feel for you. BTW, my third comment is the one you pay most attention to ;-) — Scary Wombat
– Scary Wombat, Commented Jun 27, 2019 at 1:48

bobo zzz · Accepted Answer · 2019-06-27 01:45:24Z

1

two way you can use. Actually the same kind. but I prefer lambda

public class StackOverFlowDemo {

/**
 * one
 * */
public static class MyRun implements Runnable {
    private int numtimes;

    public MyRun(int numtimes) {
        this.numtimes = numtimes;
    }

    @Override
    public void run() {
        for (int i = 0; i < numtimes; i++) {
            System.out.println(String.format("Thread(%s) Running... numtimes(%d), current count (%d) ",
                    Thread.currentThread().getName(),
                    numtimes, i));
        }
    }
}

/**
 * another way
 * */
public static void print(int numtimes) {
    for (int i = 0; i < numtimes; i++) {
        System.out.println(String.format("Thread(%s) Running... numtimes(%d), current count (%d) ",
                Thread.currentThread().getName(),
                numtimes, i));
    }
}

public static void main(String[] args) {
    /**
     * one
     * */
    Thread t1 = new Thread(new MyRun(150), "thread 1");
    Thread t2 = new Thread(new MyRun(200), "thread 2");
    t1.start();
    t2.start();

    /**
     * another way
     * */
    new Thread(() -> StackOverFlowDemo.print(150), "t1").start();
    new Thread(() -> StackOverFlowDemo.print(200), "t2").start();
}

}

answered Jun 27, 2019 at 1:45

bobo zzz

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2 Comments

Scary Wombat Over a year ago

This is a better answer, but why not use System.out.format

bobo zzz Over a year ago

ok, i got it thanks ^_^. usually I use slf4j with lombok @slf4j annotation in real project,so do not know System.out.format

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