JAVA编程思想学习笔记7-chap19-21-斗之气7段

1.枚举

2.内置三种注解

• @Override
• @Deprecated
• @SuppressWarnings

3.元注解：用于注解其它注解

　　

4.注解处理器：通过反射

5.创建线程的两种方式

• 实现Runnable接口：推荐
• 继承Thread类

package com.chengjie;

class ThreadImpl1 implements Runnable {
    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("ThreadImpl1.fun() is called!");
        }
    }
}

class ThreadImpl2 extends Thread {
    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("ThreadImpl2.fun() is called!");
        }
    }
}

public class TestThread {
    public static void main(String[] args) {
        Thread t1 = new Thread(new ThreadImpl1());
        Thread t2 = new ThreadImpl2();
        t1.start();
        t2.start();
    }
}

6.后台（daemon）线程

7.共享资源

• 访问资源方法上添加synchronized关键字
• 同步控制块：synchronized(this)
• 显式使用lock：java.util.concurrent
• volatile：发生在变量上的写操作对所有的读操作可见