java - 继续收到此错误 : "variable total might not have been initialized"

Question

我真的不知道是什么问题，因为 total 已初始化，因为程序总是从情况 1 开始，因为 click 最初等于 1。我必须在哪里初始化它，或者有什么问题？

enterBut.addActionListener(new ActionListener()
        {
               public void actionPerformed(ActionEvent e)
               {

                switch(click)
                    {

                      case 1:
                          double subtotal = Double.parseDouble(Atext.getText());
                          double total = 0.05*Math.round(1.13*subtotal/0.05);
                          answer.setText("The total will be $" + total + " (tax included). Enter the amount of money the customer gave.");
                          int click = 2;

                      case 2:
                          double money = Double.parseDouble(Atext.getText());
                          click = 3;
                          if (money<total)
                          {
                              JOptionPane.showMessageDialog(window, "That is not enough money.");
                              click = 2;
                          }
                    }

               }

        });

Answer 1

你需要把总外开关的定义，像这样:

enterBut.addActionListener(new ActionListener()
    {
           public void actionPerformed(ActionEvent e)
           {
             double total = 0;
            switch(click)
                {

                  case 1:
                      double subtotal = Double.parseDouble(Atext.getText());
                      total = 0.05*Math.round(1.13*subtotal/0.05);
                      answer.setText("The total will be $" + total + " (tax included). Enter the amount of money the customer gave.");
                      int click = 2;

                  case 2:
                      double money = Double.parseDouble(Atext.getText());
                      click = 3;
                      if (money<total)
                      {
                          JOptionPane.showMessageDialog(window, "That is not enough money.");
                          click = 2;
                      }
                }

           }

    });