IT十八掌作业_java基础第八天_多线程
/**
*1. 5辆汽车过山洞，依次经过山洞。每辆车通过山洞花费10秒，使用多线程实现。
*/
//山洞
class Cave
{
}
//汽车
class Car extends Thread
{
private String name;
private Cave cave;
public Car()
{}
public Car(Cave cave ,String name)
{
this.cave = cave;
this.name = name;
}
public void run()
{
synchronized(cave)
{
System.out.println(name + ",进洞了！");
try
{
Thread.sleep(1000);
System.out.println(name + "出洞了");
}
catch (Exception e)
{
System.out.println("错了！");
}
}
}
}
class ThreadDemo3
{
public static void main(String[] args)
{
Cave cave = new Cave();
Car c1 = new Car(cave,"C1");
Car c2 = new Car(cave,"C2");
Car c3 = new Car(cave,"C3");
Car c4 = new Car(cave,"C4");
Car c5 = new Car(cave,"C5");
c1.start();
c2.start();
c3.start();
c4.start();
c5.start();
}
}
/**
*2. 用多线程模拟蜜蜂和熊的关系。
蜜蜂是生产者，熊是消费者。蜜蜂生产蜂蜜是累加的过程，熊吃蜂蜜是批量（满100吃掉）的过程。
生产者和消费者之间使用通知方式告知对方。注意不能出现死锁的现象。
*/
class SmallBee extends Thread
{
private java.util.List<Integer> list ;
final static int MAX = 100;
private String name;
public SmallBee(String name,java.util.List<Integer> list)
{
this.name = name;
this.list = list;
}
public void run()
{
while (true)
{
synchronized(list)
{
//添加蜂蜜
if (list.size() < MAX)
{
list.add(new Integer(list.size()));
try
{
Thread.sleep(100);
}
catch (Exception e)
{
}
System.out.println(name + ":" + list.size());
//通知 线程 == 熊
list.notify();
}
//蜂蜜满了--- 等待
if (list.size() == MAX)
{
System.out.println("蜂蜜满了，快来吃。。。");
try
{
list.wait();
}
catch (Exception e)
{
}
}
}
}
}
}
class Bear extends Thread
{
private java.util.List<Integer> list ;
private String name;
public Bear(String name , java.util.List<Integer> list)
{
this.name = name;
this.list = list;
}
public void run()
{
while (true)
{
synchronized (list){
//查看蜂蜜是否满了
if (list.size() >= 100)
{
System.out.println("开始吃蜂蜜了,蜂蜜数量："+list.size());
//remove 前100个元素
for (int j = list.size()-1;j >= 0 ;j-- )
{
Integer tmp = list.remove(j);
System.out.println(name + "吃了"+tmp);
}
System.out.println("已经吃完了,蜂蜜还剩余："+list.size());
list.notify();
}else
{
try
{
System.out.println("等蜂蜜吃");
list.wait();
}
catch (Exception e)
{
}
}
}
yield();
}
}
}
class ThreadDemo4
{
public static void main(String[] args)
{
java.util.List<Integer> list = new java.util.ArrayList<Integer>();
SmallBee sb1 = new SmallBee("S1",list);
SmallBee sb2 = new SmallBee("S2",list);
SmallBee sb3 = new SmallBee("S3",list);
Bear b1 = new Bear("熊大",list);
Bear b2 = new Bear("熊二",list);
sb1.start();
sb2.start();
sb3.start();
b1.start();
b2.start();
}
}