多线程（二）Java多线程，启动四个线程，两个执行加一，另外两个执行减一

public class Test {
	public static void main(String[] args) {
		final ShareData data = new ShareData();

		for (int i = 0; i < 2; i++) {
			new Thread(new Runnable() {
				public void run() {
					try {
						data.inc();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}).start();
		}

		for (int i = 0; i < 2; i++) {
			new Thread(new Runnable() {

				public void run() {
					try {
						data.dec();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}).start();
		}
	}

}

class ShareData {
	private int i = 100;

	public synchronized void inc() throws InterruptedException {
		i++;
		System.out.println(Thread.currentThread().getName() + "--inc--" + i);
	}

	public synchronized void dec() throws InterruptedException {
		i--;
		System.out.println(Thread.currentThread().getName() + "--dec--" + i);
	}
}

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