Java's synchronous and asynchronous simple use of a method

--异步
Thread t3 = new Thread(new Runnable() {

@Override
public void run() {
try {

for (int i = 0; i < 10; i++) {

Thread.sleep(1100);

System.out.println("4:"
+ i);
}
} catch (Exception e) {
e.printStackTrace();
}

}
});t3.start();

--同步
SwingUtilities.invokeAndWait(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub

}
});

t3.isAlive()