Javaでマルチスレッド

Main.java

package com.example.multithread;

public class Main {

    public static void main(String[] args) {

        MultiThread mt1 = new MultiThread(1);
        MultiThread mt2 = new MultiThread(2);
        MultiThread mt3 = new MultiThread(3);

        mt1.start();
        mt2.start();
        mt3.start();
    }

}

class MultiThread extends Thread {

    MultiThread(int tn){
        this.threadNumber = tn;
    }

    private int threadNumber;

    @Override
    public void run() {
        for (int i=1;i<4;i++) {
            try {
                Thread.sleep(1000);
                System.out.println(
                        "Thread"+this.threadNumber+" counts "+i+" times."
                );
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

}

// Output Sample

//    Thread3 counts 1times.
//    Thread2 counts 1times.
//    Thread1 counts 1times.
//    Thread1 counts 2times.
//    Thread2 counts 2times.
//    Thread3 counts 2times.
//    Thread3 counts 3times.
//    Thread1 counts 3times.
//    Thread2 counts 3times.