多线程的两种实现方法

继承Thread实现只能一个run只能运行一次
继承Runnable实现可以将一个Runnable多次放入线程，从而实现一个成员同时多次运行。

class FileTransThread extends Thread{
	private String filename;
	public FileTransThread(String name) {
		filename=name;
	}
	public void run() {
		System.out.println("transfer"+" "+filename);
		try {
			sleep(1000);
		}catch(Exception e) {}
		System.out.println(filename+" "+"transfer sucessfully!");
    }
}

class FileTransRunnable implements Runnable{
	private String filename;
	public FileTransRunnable(String name) {
		filename=name;
	}
	public void run() {
		System.out.println("transfer"+" "+filename);
		try {
			Thread.sleep(1000);
		}catch(Exception e) {}
		System.out.println(filename+" "+"transfer sucessfully!");
    }
}

public class MyCode {

	public static void main (String[] args) {
		FileTransThread ft1=new FileTransThread("hhh");
		FileTransThread ft2=new FileTransThread("ggg");
		FileTransThread ft3=new FileTransThread("xxx");
		ft1.start();
		ft2.start();
		ft3.start();
		FileTransRunnable ft4=new FileTransRunnable("iii");
		FileTransRunnable ft5=new FileTransRunnable("yyy");
		FileTransRunnable ft6=new FileTransRunnable("ttt");
		Thread th1=new Thread(ft4);
		Thread th2=new Thread(ft5);
		Thread th3=new Thread(ft6);
		Thread th4=new Thread(ft4);
		th1.start();
		th2.start();
		th3.start();
		th4.start();
	}
}