public
static void main(String[] args) {
//创建四条线程
Thread t1 =new GivePrice();
t1.setName("匿名A");
t1.start();
Thread t2 =new GivePrice();
t2.setName("匿名B");
t2.start();
Thread t3 =new GivePrice();
t3.setName("匿名C");
t3.start();
Thread t4 =new GivePrice();
t4.setName("匿名D");
t4.start();
}
}
//创建Thread的子类
class GivePrice extends Thread{
private
static int num =8;
int price =
(int) (Math.random()*100+1);
Map map =
new HashMap();
public void
run() {
while(true){
synchronized(GivePrice.class){
if(num == 0){
String k = getMax(map);
if(getName().equals(k)){
System.out.println(k+"以"+map.get(k)+"元的价格成交");
}
break;
}
try {
num--;
map.put(getName(), price);
Thread.sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
//找出map中存储的最高价,循环遍历:用增强for
private String getMax(Map map)
{
int max = 0;
String k = "";
for ( String key: map.keySet()) {
int m= map.get(key);
if(max < m){
int temp = max;
max = m;
m = temp;
k=key;
}
}
System.out.println(k);
return k;
}
}