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分享JAVA多线程生产者和消费者问题的两种写法（一种出错了）
[size=24px]希望大神指点
//这个代码是正确的 同步锁是Clerk这个类的对象的this指针 方法放在Clerk这个类 相当于资源类 把生产和消费全都放在了
Clerk类中
public class Test {
public static void main(String[] args) {
Clerk clerk=new Clerk();
Pro p=new Pro(clerk);
Runnable c=new Consumer(clerk);
Thread t1=new Thread(p);
Thread t2=new Thread(c);
t1.start();
t2.start();
}
}
class Clerk
{
int product;
public synchronized void addProduct() {
if(product>=20)
{
try {
wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
product++;
System.out.println(Thread.currentThread().getName()+"生产了第"+product+"个产品");
notify();
}
}
public synchronized void comsumer() {
if(product<=0)
{
try {
wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
System.out.println(Thread.currentThread().getName()+"消费了第"+product+"个产品");
product--;
notify();
}
}
}
class Pro implements Runnable
{
Clerk clerk;
public Pro(Clerk clerk)
{
this.clerk=clerk;
}
public void run() {
System.out.println("生产者开始生产产品");
while(true)
{
clerk.addProduct();
}
}
}
class Consumer implements Runnable{
Clerk clerk;
public Consumer(Clerk clerk)
{
this.clerk=clerk;
}
public void run() {
System.out.println("消费者开始消费产品");
while(true)
{
clerk.comsumer();
}
}
}
//但是我换了一个思路 把添加产品和消费产品放在了生产者和消费者类中，然后产品个数只是在资源类中，以资源类的那个对象作为同步锁 结果程序炸了
//生产者消费者问题
//发生异常的程序
public class PruducerAndCustomerTest {
public static void main(String[] args) {
Resource resource=new Resource();
Runnable producer=new Producer(resource);
Runnable customer=new Customer(resource);
Thread t1=new Thread(producer);
Thread t2=new Thread(customer);
t2.start();
t1.start();
}
}
class Producer implements Runnable
{
private Resource resource;
public Producer(Resource r)
{
this.resource=r;
}
public void run() {
while(true)
{
synchronized (resource)
{
try {
Thread.sleep(50);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
if (resource.product >=50)
{
try
{
wait();
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else {
resource.product++;
System.out.println("生产了第" + resource.product + "个产品");
notifyAll();
}
}
}
}
}
class Customer implements Runnable
{
private Resource resource;
public Customer(Resource r)
{
this.resource=r;
}
public void run() {
while(true)
{
synchronized (resource)
{
if (resource.product <= 0)
{
try
{
wait();
} catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
System.out.println("消费了第" + resource.product + "个产品");
resource.product--;
notifyAll();
}
}
}
}
}
class Resource
{
public int product=50;
}
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qq_35406668 2016-07-05
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wait( ); notify( );前面要加resource.
holzkoepfer 2016-06-06
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IllegalStateException是说没有获得当前Obj的锁
修改方式有点反直觉，wait（）的对象不是Producer或者Customer，而是resource
public class ProducerAndCustomerTest {
public static void main(String[] args) {
Resource resource=new Resource();
Runnable producer=new Producer(resource);
Runnable customer=new Customer(resource);
Thread t1=new Thread(producer);
Thread t2=new Thread(customer);
t2.start();
t1.start();
}
}
class Producer implements Runnable
{
private Resource resource;
boolean overLimit = false;
public Producer(Resource r)
{
this.resource=r;
}
public void run() {
while(true)
{
synchronized (resource)
{
try {
Thread.sleep(50);
} catch (InterruptedException e1) {
}
if (resource.product >=50)
{
try
{
resource.wait();
}
catch (InterruptedException e)
{
}
}else {
resource.product++;
System.out.println("生产了第" + resource.product + "个产品");
resource.notify();
}
}
}
}
}
class Customer implements Runnable
{
private Resource resource;
boolean hasProduction = false;
public Customer(Resource r)
{
this.resource=r;
}
public void run() {
while(true)
{
synchronized (resource)
{
if (resource.product <= 0)
{
try
{
resource.wait();
} catch (InterruptedException e)
{
}
}
else
{
System.out.println("消费了第" + resource.product + "个产品");
resource.product--;
resource.notify();
}
}
}
}
}
class Resource
{
public int product=50;
}
imddsfds 2016-06-04
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- 举报
class PruducerAndCustomerTest {
public static void main(String[] args) {
Resource resource=new Resource();
Runnable producer=new Producer(resource);
Runnable customer=new Customer(resource);
Thread t1=new Thread(producer);
Thread t2=new Thread(customer);
t2.start();
t1.start();
}
}
class Producer implements Runnable
{
private Resource resource;
public Producer(Resource r)
{
this.resource=r;
}
public void run() {
while(true)
{
synchronized (resource)
{
/* try {
Thread.sleep();
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}*/
if (resource.product >=50)
{
try
{
resource.wait();
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else {
resource.product++;
System.out.println(Thread.currentThread().getName()+"生产了第" + resource.product + "个产品");
resource.notifyAll();
}
}
}
}
}
class Customer implements Runnable
{
private Resource resource;
public Customer(Resource r)
{
this.resource=r;
}
public void run() {
while(true)
{
synchronized (resource)
{
if (resource.product <= 0)
{
try
{
resource.wait();
} catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else
{
System.out.println(Thread.currentThread().getName()+"消费了第" + resource.product + "个产品");
resource.product--;
resource.notifyAll();
}
}
}
}
}
class Resource
{
public int product=50;
}
// 如果不是有多条生产者线程和多条消费者线程 用notify()就可以的 当然只是我的见解
