第24行为为什么String类型的和int 类型的数可以相加？ - 黑马程序员技术交流社区

package cn.itcast.demo1;
/**
* 生产者，消费者
*
* */
class Resource
{
private String name;
private int count = 1;
private boolean flag = false;
public synchronized void set(String name)
{
while(flag)
try {
wait();
} catch (InterruptedException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
this.name = name+count;//<font size="5" color="#ff0000">为什么String类型的和int类型的数可以相加？</font>
count++;
System.out.println(Thread.currentThread().getName()+"...生产者......."+this.name);
flag = true;
notifyAll();
}
public synchronized void out()
{
while(!flag)
try {
wait();
} catch (InterruptedException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"...消费者..."+this.name);
flag = false;
notifyAll();
}
}
class Producer implements Runnable
{
private Resource r ;
Producer(Resource r)
{
this.r = r;
}
@Override
public void run() {
// TODO 自动生成的方法存根
while(true)
r.set("烤鸭");
}
}
class Consumer implements Runnable
{
private Resource r ;
Consumer(Resource r)
{
this.r = r;
}
@Override
public void run() {
// TODO 自动生成的方法存根
while(true)
{
r.out();
}
}
}
public class ProducerConsumer {
/**
* @param args
*/
public static void main(String[] args) {
// TODO 自动生成的方法存根
Resource r = new Resource();
Producer pro = new Producer(r);
Consumer con = new Consumer(r);
Thread t0 = new Thread(pro);
Thread t1= new Thread(pro);
Thread t2 = new Thread(con);
Thread t3 = new Thread(con);
t0.start();
t1.start();
t2.start();
t3.start();
}
}

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