CAS实现计数器

package q4;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

public class Counter {
	private AtomicInteger atomicInteger=new AtomicInteger(0);
	private int i=0;
	public static void main(String[] args) {
		final Counter cas=new Counter();
		
		List ts=new ArrayList<>();
		long start=System.currentTimeMillis();
		for(int  i=0;i<100;i++) {
			Thread thread=new Thread(new Runnable() {
				
				@Override
				public void run() {
					// TODO Auto-generated method stub
					for(int i=0;i<10000;i++) {
						cas.count();
						cas.safeCount();
					}
				}
			});
			ts.add(thread);
		}
		for(Thread t:ts) {
			t.start();
		}
		for(Thread t:ts) {
			try {
				t.join();
			} catch (Exception e) {
				// TODO: handle exception
			}
			
		}
		System.out.println(cas.i);
		System.out.println(cas.atomicInteger.get());
		System.out.println(System.currentTimeMillis());
	}
	private void count() {
		i++;
	}
	private void safeCount() {
		for(;;) {
			int i=atomicInteger.get();
			boolean suc=atomicInteger.compareAndSet(i, ++i);
			if (suc) {
				break;
			}
		}
	}
}