Synchronized (同步) block使用实例

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package com.synchronoizre;

class Counter {
    private int c = 0;
    public void increase(){
        c++;
    }
    public void decrease(){
        c--;
    }
    public int value(){
        return c;
    }
}
    public class SynchronizeDemo {
        public static void main(String[] args) {
            final Counter counter = new Counter();
            Thread t1 = new Thread(new Runnable(){

                @Override
                public void run() {
                    synchronized(counter){
                    System.out.println("现在的c值："+counter.value());
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {

                    }
                    counter.increase();
                    System.out.println("加一后c的值："+counter.value());
                    }
                }

            });


            Thread t2 = new Thread(new Runnable(){

                @Override
                public void run() {
                    //加一个同步块
                    synchronized(counter){
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException ex) {

                    }
                    counter.decrease();
                    }
                }

            });

            t1.start();
            t2.start();

        }

}

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