Thread Test!!

import java.util.LinkedList;
import java.util.List;


public class Can {
public static int count = 0;
public LinkedList<String> can = new LinkedList<String>();

public Can(){
count++ ;
System.out.println(count);
}
public void addObj(String obj){
can.addLast(obj);
}
public void removeObj(){
can.removeLast();
}
@Override
public String toString() {
return can.toString();
}
}

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class Person implements Runnable{

public String name;

public Can can;

public Person(Can can, String name){

this.can = can ;

this.name = name ;

}

public void action(){

int SIZE = 100;

if(can.can.size() == SIZE){

for(int i = 0 ; i < SIZE; i++){

can.removeObj();

System.out.println(name +" take");

}

}else{

for(int i = 0 ; i < SIZE; i++){

can.addObj(name);

System.out.println(name +" drop");

}

}

}

@Override

public void run() {

//synchronized(this){ // 鎖在自己身上。沒用！！
synchronized(can){  // 鎖在同樣的instance上。work!!

action();

}

}

}

public class Main {

public static Can c = new Can();

public static Can getACan(){

return c;  // 模擬Container, singleton

// return new Can();// 模擬Container, non-singleton

}

public static void main(String[] args) {

Can can = getACan();

Thread p1Action = new Thread(new Person(getACan(), "A"));

p1Action.start();

Thread p2Action = new Thread(new Person(getACan(), "B"));

p2Action.start();

}

}