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111 lines (78 loc) · 2.23 KB
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import java.util.Random;
/**
* Created by mac on 2/13/17.
*/
public class Main {
public static void main(String[] args) {
Message message = new Message();
(new Thread(new Writer(message))).start();
(new Thread(new Reader(message))).start();
}
}
class Message {
private String message;
private boolean empty = true;
public synchronized String read(){
while(empty){
try{
wait();
} catch(InterruptedException e){
}
}
empty = true;
notifyAll();
return message;
}
public synchronized void write(String message){
while(!empty){
try{
wait();
}catch(InterruptedException e){
}
}
empty = false;
this.message = message;
notifyAll();
}
}
class Writer implements Runnable{
private Message message;
public Writer(Message message){
this.message = message;
}
public void run()
{
String messages[] = {
"Humpty Dumpty sat on a wall",
"Humty Dumpty had a great fall",
"All the king's horses and all the men",
"Couldn't put Humpty together again"
};
//create instance of a random class so we could have a random delay
Random random = new Random();
for(int i =0; i<messages.length; i++){
message.write(messages[i]);
try{
Thread.sleep(random.nextInt(2000));
} catch (InterruptedException e){
}
}
message.write("Finished");
}}
class Reader implements Runnable{
private Message message;
public Reader(Message message){
this.message = message;
}
public void run(){
Random random = new Random();
for(String latestMessage = message.read(); !latestMessage.equals("Finished");
latestMessage = message.read()) {
System.out.println(latestMessage);
try{
Thread.sleep(random.nextInt(2000));
} catch(InterruptedException e){
}
}
}
}