若编译和运行下列代码,出现的结果将是 ( ) public class MyAdd extends Thread{ static int total = 10; int n; public MyAdd(int n) { this.n=n; } public void run() { try{ sleep(n); total=total+n; System.out.println(total); }catch(Exception e){ System.out.println(“EXCEPTION!”); } } public static void main(String[] args) { MyAdd t1 = new MyAdd(3000); MyAdd t2 = new MyAdd(1000); t1.start(); t2.start(); } }