📄 shop.java
字号:
/**
* A concrete state for customer shopping
*/
import java.io.*;
public class Shop extends ShopState {
public static boolean instanceFlag = false; //true if have 1 instance
private Shop() {
}
public static Shop getInstance() {
if(! instanceFlag) {
instanceFlag = true;
return new Shop();
}
return null;
}
public void shop() {
System.out.println("The state is shopping now !");
}
}
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