下面 Java 程序的输出结果可能是（） class MyThread1 extends Thread { public void run() { Test.n1 = Test.n2; Test.n2 = -1; } } class MyThread2 extends Thread { public void run() { Test.n2 = Test.n1; Test.n1 = -1; System.out.printf(“%d %dn”, Test.n1, Test.n2); } } public class Test { public static int n1 = 0; public static int n2 = 1; public static void main(String[] args) { MyThread1 t1 = new MyThread1(); MyThread2 t2 = new MyThread2(); t1.start(); t2.start(); } }