與Java線程

Question

工作，我有兩種類型的線程

線程1的：填充一個多線程安全的數據結構

線程2的：搜索的數據結構

我要開始一個特定的密鑰線程2的前出現在地圖的任何數據，所以我這樣做的方式是：

//Main 
spawn 3 new thread 2's(name, map) 
spawn 3 new thread 1's(name, value, map) 

let threads handle rest 

//Thread1 
private string name; 
private string value; 

public void run(){ 
    try{ 
     synchronized(map){ 
      map.put(key, value); 
      map.notifyAll(); 
     } 
    } 
} 

//Thread2 

private string name; 
public void run(){ 
    try{ 
     synchronized(map){ 
      while (map.size() <1){ 
       map.wait(); 
      } 
     } 

     if (map.containsKey(name){ 
      System.out.println(name, map.get(name)); 
     } 
    } 
} 

我想要的行爲：由於線程1的put對進入地圖，線程2的c係數嘿，如果他們的名字匹配一對，如果是這樣打印它的價值。

行爲我越來越：

//Result 
Putting bluecheese -- white//This line is printed in thread 1 right before the map.put call 
Putting chipotle -- food 
Putting dogbone -- dog 

food 

**** should have been food, dog, white (no order to this, just make sure we account for them all) 


//Result #2 
Putting bluecheese -- white//This line is printed in thread 1 right before the map.put call 
Putting chipotle -- food 
Putting dogbone -- dog 

white, dog //This line is printed in thread 2. 

**** should have been white, dog, food (no order, again just make sure we account for them all) 

Answer 1

呼叫等待/通知必須是一個同步塊內，並在while循環：

嘗試：

synchronize(map) { 
    while(!map.size() > 0){ 
     try { 
      map.wait() 
     catch(InterruptedException e) {} 
    } 
} 

然後通知在您將一些物品放入之後的線程：map.notify()。