modify question

data/2.Java中阶/11.并发/4.线程之间的协作/ProductorAndConsumer.md

@@ -58,7 +58,7 @@ a2
 
 ## 答案
 
-```
+```java
 new Producter("b", queue).start();
 try {
     Thread.sleep(7000);
@@ -73,7 +73,7 @@ new Consumer(queue).start();
 
 ### A
 
-```
+```java
 new Producter("b", queue).start();
 new Producter("a", queue).start();
 new Consumer(queue).start();
@@ -81,7 +81,7 @@ new Consumer(queue).start();
 
 ### B
 
-```
+```java
 new Producter("b", queue).start();
 new Consumer(queue).start();
 new Producter("a", queue).start();
@@ -89,7 +89,7 @@ new Producter("a", queue).start();
 
 ### C
 
-```
+```java
 new Producter("b", queue).start();
 try {
     Thread.sleep(2000);