import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;import java.lang.String;public class Calculate{public static void main (String[] args){FrameSize frame = new FrameSize();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.show();}}class FrameSize extends JFrame{public FrameSize(){ setSize(600,400); //設置框架尺寸 ButtonPanel panel2 = new ButtonPanel(); Container contentPane = getContentPane();contentPane.add(panel2); }}//創建按鈕面板class ButtonPanel extends JPanel {public ButtonPanel(){JButton Button1 = new JButton("0"); //創建按鈕JButton Button2 = new JButton("1");JButton Button3 = new JButton("2");add(Button1); add(Button2);add(Button3);ButtonAction ButtonAction1 = new ButtonAction("1"); //40行找不到符號ButtonAction ButtonAction2 = new ButtonAction("2"); //41行找不到符號ButtonAction ButtonAction3 = new ButtonAction("3"); //42行找不到符號Button1.addActionListener(ButtonAction1); Button2.addActionListener(ButtonAction2);Button3.addActionListener(ButtonAction3);}private class ButtonAction implements ActionListener{public void actionPerformed(ActionEvent event){Object source = event.getSource();if(source == Button1) ButtonText = "0";else if(source == Button2) ButtonText = "1";else if(source == Button3) ButtonText = "2"; repaint();}}private JButton Button1;private JButton Button2;private JButton Button3;public String ButtonText=" ";}
2 回答
尚方寶劍之說
TA貢獻1788條經驗 獲得超4個贊
你這BUTTONACTION什么意思啊!?有這么一個語句的嗎?
private class ButtonAction implements ActionListener
這個里面,你自己都寫了點3個BUTTON的不同情況時候設計BUTTONTEXT的情況了.為什么還要搞3個BUTTONACTION?
試一下把下面3行刪除
ButtonAction ButtonAction1 = new ButtonAction("1"); //40行找不到符號
ButtonAction ButtonAction2 = new ButtonAction("2"); //41行找不到符號
ButtonAction ButtonAction3 = new ButtonAction("3"); //42行找不到符號
下面的是改的:
Button1.addActionListener(new ButtonAction() );
Button2.addActionListener(new ButtonAction());
Button3.addActionListener(new ButtonAction());
這樣應該能達到你的效果.
蠱毒傳說
TA貢獻1895條經驗 獲得超3個贊
你并沒有定義ButtonAction類的構造函數
但在聲名對象時卻傳入了參數，當然不行啊！
例如ButtonAction ButtonAction1 = new ButtonAction("1");中的參數"1"，給刪了，能運行
你這個程序是測試程序嗎？運行沒有實際的效果出現。
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