update,

it114105/itp4507/Assignment/20-21/src/LunchSet.java

@@ -0,0 +1,54 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+/**
+ *
+ * @author JerryKwok
+ */
+public abstract class LunchSet {
+    private String mainDish;
+    private int price;
+    private int availableCount;
+
+    public LunchSet(String mainDish, int price, int availableCount) {
+        this.mainDish = mainDish;
+        this.price = price;
+        this.availableCount = availableCount;
+    }
+
+    public String getMainDish() {
+        return mainDish;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public int getAvailableCount() {
+        return availableCount;
+    }
+    
+    public void setAvailableCount(int availableCount){
+        this.availableCount = availableCount;
+    }
+
+    public void setMainDish(String mainDish) {
+        this.mainDish = mainDish;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+    
+    
+    public void reduceOneAvailableCount(){
+        availableCount--;
+    }
+    
+    public abstract String getSideDish();
+    public abstract String getDetails();
+    public abstract LunchSetMemento saveMemento();
+}