子类中重新定义父类属性

package com.imooc.thread;

class MyThread1 extends Thread{
	private String name;
	public MyThread1(String name) {
		this.name = name;
	}

	public void run() {
		for(int i = 0; i <30; i++) {
			System.out.println(Thread.currentThread().getName()+"正在运行"+i);
		}
	}
}

public class ThreadTest5 {
	public static void main(String[] args) {
		MyThread1 thread1 = new MyThread1("thread1");
		MyThread1 thread2 = new MyThread1("thread2");

		thread1.setPriority(Thread.MAX_PRIORITY);
		thread2.setPriority(Thread.MIN_PRIORITY);

		thread1.start();
		thread2.start();
	}
}

对于上面这段代码里面的MyThread1类继承了Thread类，同时定义了一个name属性，我想问一下，有必要重新定义name属性吗？Thread类里面不是有name属性吗