Java Atomic代码

package javaBasic;

import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

public class JavaAmoticTest {
    static abstract class CalculatorBase {
        // Creates a new {@code AtomicBoolean} with initial value {@code false}.
        AtomicBoolean calledStart = new AtomicBoolean();
        AtomicBoolean calledDispose = new AtomicBoolean();

        protected void StartCore() {
            boolean called = calledStart.getAndSet(true);
            // if Called is False, Keeping Running
            // if not match, throw java.lang.AssertionError
            // and output error message.
            assert !called;
            try {
                Thread.sleep(1000);
                System.out.println("Start Finished");
            } catch (InterruptedException e) {
            }
        }

        protected void DisposeCore() {
            boolean called = calledDispose.getAndSet(true);
            assert !called;
            try {
                Thread.sleep(1000);
                System.out.println("Dispose Finished");
            } catch (InterruptedException e) {
            }
        }

        public abstract void Start();

        public abstract void Dispose();
    }

    static class CasCalculator extends CalculatorBase {
        // Creates a new AtomicInteger with the given initial value.
        AtomicInteger state = new AtomicInteger(kNotStarted);

        static final int kNotStarted = 0, kStarting = 1, kStarted = 2,
                kDisposed = 3;

        @Override
        public void Start() {
            // Atomically sets the value to the given updated value
            // if the current value {@code ==} the expected value.
            boolean succeed = state.compareAndSet(kNotStarted, kStarting);
            if (succeed) {
                synchronized (this) {
                    StartCore();
                }
                boolean cont = state.compareAndSet(kStarting, kStarted);
                if (!cont) {
                    synchronized (this) {
                        DisposeCore();
                    }
                }
            }
        }

        @Override
        public void Dispose() {
            // Atomically sets to the given value and returns the old value.
            int orig = state.getAndSet(kDisposed);
            if (orig == kStarted) {
                synchronized (this) {
                    DisposeCore();
                }
            }
        }

        public static void main(String[] args) throws InterruptedException {
            final CasCalculator cal = new CasCalculator();
            new Thread() {
                @Override
                public void run() {
                    cal.Start();

                }
            }.start();

            new Thread() {
                @Override
                public void run() {
                    cal.Start();
                }
            }.start();

            new Thread() {
                @Override
                public void run() {
                    cal.Start();
                }
            }.start();

        }

    }

}