スレッドThreadクラスRunnableインタフェースの違い

package com.thread;

public class MyThread extends Thread{  
    
    private int ticket = 10;  

    public void run(){  
        for(int i =0;i<500;i++){  
            if(this.ticket>0){  
                System.out.println(Thread.currentThread().getName()+" ---->"+(this.ticket--));  
            }  
        }  
    }  
    
    public static void main(String[] args) {  
    	
    	MyThread mt = new MyThread();
    	Thread t1 = new Thread(mt, " ");
		Thread t2 = new Thread(mt, " ");
		Thread t3 = new Thread(mt, " ");
		t1.start();
		t2.start();
		t3.start();
    	
    } 
}  

package com.thread;

public class myRunnable implements Runnable {

	private int ticket = 10;
	public void run() {
		for (int i = 0; i < 500; i++) {
			if (this.ticket > 0) {
				System.out.println(Thread.currentThread().getName() + " エ---->"
						+ (this.ticket--));
			}
		}
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		myRunnable mt = new myRunnable();
		Thread t1 = new Thread(mt, " ");
		Thread t2 = new Thread(mt, " ");
		Thread t3 = new Thread(mt, " ");
		t1.start();
		t2.start();
		t3.start();
	}

}