视窗与绘图库

1 AlaCarteMenu 1 importjava awt AbstractWindowingToolkit視窗與繪圖庫importjava awt event 事件與元件importjavax swing 類別庫importjavax swing event 按鈕 捲軸 文字框等元件importjava text DecimalFormat 小數格式publicclassAlaCarteextendsJFrameimplementsActionListener AlaCarte類別繼承自JFrame 實作 傾聽介面staticDecimalFormattwoDigits newDecimalFormat 0 00 staticString yourChoicesItems 選項及價目表 BlueberryMuffins0 85 StrawberryBagels0 80 LiteYogurt0 75 VanillaIceCream2 75 HashBrowns2 50 Toast2 00 FrenchFries1 50 OnionSoup3 00 Coffee0 90 IcedTea1 00 HotChocolate1 75 AlaCarte java網頁視窗線上點餐 2 AlaCarteMenu 2 staticdouble yourChoicesPrices 0 85 0 80 0 75 2 75 2 50 2 00 1 50 3 00 0 90 1 00 1 75 單價privateJListyourChoices privateJTextAreabill privateContainerpane 定義 選擇 帳單 工作區 繼承Component類別publicAlaCarte 定義建構元AlaCarte super 歡迎光臨JavaKiosk法式點心城 呼叫父類別JFrame 宣告工作區 設定背景顏色及邊界pane getContentPane pane setBackground newColor 0 200 200 紅綠藍強度0 255pane setLayout newBorderLayout 5 5 抬頭在北區NORTH 設定表頭及字型JLabelyourChoicesJLabel newJLabel ALACARTE網頁菜單 pane add yourChoicesJLabel BorderLayout NORTH yourChoicesJLabel setFont newFont Dialog Font BOLD 20 點選在西區WEST 設定字型yourChoices newJList yourChoicesItems pane add newJScrollPane yourChoices BorderLayout WEST yourChoices setFont newFont Courier Font BOLD 14 3 AlaCarteMenu 3 結帳在東區EAST 設定字型bill newJTextArea pane add bill BorderLayout EAST bill setFont newFont Courier Font PLAIN 12 確認按鈕在南區SOUTH 加入傾聽介面JButtonbutton newJButton 送出 pane add button BorderLayout SOUTH button addActionListener this 點選按鈕送出ActionPerformedsetSize 500 360 setVisible true setDefaultCloseOperation EXIT ON CLOSE 關閉視窗 顯示及計算帳單細目privatevoiddisplayBill int listArray yourChoices getSelectedIndices doublelocalTax 0 065 doubletax 稅率doublesubTotal 0 doubletotal 4 AlaCarteMenu 4 帳單預設為不可編輯區bill setEditable false bill setText 計算點餐價目for intindex 0 index listArray length index subTotal subTotal yourChoicesPrices listArray index tax localTax subTotal total subTotal tax 顯示點餐細目及應付金額bill append JAVAKIOSKALACARTE n n bill append 謝謝點餐 n n for intindex 0 index listArray length index bill append yourChoicesItems listArray index n bill append n bill append SUBTOTAL t t twoDigits format subTotal n bill append TAX t t twoDigits format tax n bill append TOTAL t t twoDigits format total n n bill append Thankyou HaveaNiceDay n n 5 AlaCarteMenu 5 清空帳單內容yourChoices clearSelection repaint publicvoidactionPerformed ActionEventevent 接受傾聽介面 if event getActionCommand equals 送出 displayBill 呼叫displayBill方法publicstaticvoidmain String args 主程式 AlaCartealc newAlaCarte 宣告及執行AlaCarte方法 6 ALACARTEMEN