用两个线程，一个输出字母，一个输出数字，交替输出：1A2B3C4D5E.....26Z

static Thread t1=null,t2=null;
public static void main(String[] args)throws Exception {
	char[] aI = "1234567".toCharArray();
	char[] aC = "ABCDEFG".toCharArray();
	t1=new Thread(()->{
		for (char c : aI) {
			System.out.println(c);
			LockSupport.unpark(t2);
			LockSupport.park();
		}
	},"t1");
	
	t2=new Thread(()->{
		for (char c : aC) {
			LockSupport.park();
			System.out.println(c);
			LockSupport.unpark(t1);
		}
	},"t2");
	t1.start();
	t2.start();
}