【笔记】同步方法

package method;

public class Demo {
    public static void main(String[] args) {
        MyRunable mr = new MyRunable();

        Thread tr1 = new Thread(mr);
        Thread tr2 = new Thread(mr);


        tr1.setName("张三");
        tr2.setName("李四");


        tr1.start();
        tr2.start();

    }
}

package method;

public class MyRunable implements Runnable {
    private int tickecount = 100;


    @Override
    public void run() {
        while (true) {
//              同步方法
//            如果获取线程的名字是张三那么就走同步方法
            if ("张三".equals(Thread.currentThread().getName())){
                boolean reasult = method();
                if(reasult){
                    break;
                }
            }
//            同步代码块
//            如果获取的线程名字是李四，那么就走同步代码块
            if ("李四".equals(Thread.currentThread().getName())){
                synchronized (this){
                    if (tickecount == 0) {
                        break;
                    } else {
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        tickecount--;
                        System.out.println(Thread.currentThread().getName() + "还在卖票，还剩" + tickecount + "张");
                    }
                }
            }
        }
    }

//可以先run方法中写好，通过快捷键提取方法
//    同步方法主要就是在返回值前加synchronized，返回值是一个boolean类型的值
    private synchronized boolean method() {
        if (tickecount == 0) {
            return true;
        } else {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            tickecount--;
            System.out.println(Thread.currentThread().getName() + "还在卖票，还剩" + tickecount + "张");
        }
        return false;
    }
}