Java import import java awt component import java
- Slides: 57
引用視窗元件時,在Java程式的開頭,要使用 import命令將這些程式匯入,命令如下: – – import java. awt. component; import java. awt. container; import java. awt. window; import java. awt. frame; 也可以使用“*”符號,匯入所有程式,命令如 下: – import java. awt. *;
JComponent的相關的元件名稱如下-1 ¬ Abstract. Button. JButton ‘按鈕元件 ¬ Abstract. Button. JMenu. Item ‘選項元件 ¬ Abstract. Button. JToggle. Button. JCheck. Box ‘核取元件 ¬ Abstract. Button. JToggle. Button. JRadio. Button ‘選取鈕元件 ¬ JColor. Chooser ‘顏色選擇元件 ¬ JCombo. Box ‘組合方塊元件 ¬ JFile. Chooser ‘檔案選擇元件 ¬ JInternal. Frame ‘子框架元件(可放入frame中) ¬ JLabel ‘標籤元件 ¬ JLayered. Pane ‘圖層平版元件
Flow. Layout: ¬ Flow. Layout(流動式版面配置)是最簡單的版面配 置技巧,元件會由左至右,由上而下依序放到視窗 容器中(例如:JFrame的Content. Pane)。 ¬ Flow. Layout物件的程式碼舉例: – Container c=frame. get. Content. Pane(); //取得Content. Pane – Flow. Layout f 1=new Flow. Layout(); //產生Flow. Layout物件 – c. set. Layout(f 1); //以Flow. Layout物件為版面配置方式
建立三個核取元件的程式碼 String str 1[]={"音樂", "體育", "美術"}; for(int i=0; i<3; i++){ JCheck. Box cp 1=new JCheck. Box(str 1[i]); //建立 JCheck. Box元件 c. add(cp 1); }
建立四個選取元件的程式碼 Button. Group bg 1=new Button. Group(); //按鈕群組 String str 2[]={"Java", "VB", "C++", "Flash"}; for(int i=0; i<4; i++){ //建立JRadio. Button元件 JRadio. Button cp 2 = new JRadio. Button(str 2[i]); c. add(cp 2); bg 1. add(cp 2); }
建立組合方塊元件的程式碼 String str 3[]={"Red", "Green", "Blue"}; JCombo. Box cp 3 = new JCombo. Box(str 3); //建立 JCombo. Box元件 c. add(cp 3);
選單視窗: ¬ 使用對話框元件的show. Option. Dialog()方法, 可以顯示選單視窗,命令如下: – Object[] obj 1 = { "一年級", "二年級", "三年級" }; – Object selected. Value = JOption. Pane. show. Input Dialog(null, "選擇年級", "選單視窗 ", JOption. Pane. INFORMATION_MESSAGE, null, obj 1[0]); 選單視窗的圖示
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