Question

我正在为我的课程完成一项任务，不幸的是我的大脑试图调试最后几行（69-84）。如果有人能给我一个很棒的手！

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*;

public class JInsurance extends JFrame implements ItemListener 
{
   final int hmoCOST = 200;
   final int ppoCOST = 600;
   final int dentalCOST = 75;
   final int visionCOST = 20;
   int totalCost = 0;
   int grandTotal = totalCost;

   JCheckBox hmoBox = new JCheckBox("HMO cost per month is $" + hmoCOST, false);
   JCheckBox ppoBox = new JCheckBox("PPO cost per month is $" + ppoCOST, false);
   JCheckBox dentalBox = new JCheckBox("Dental coverage is an additional $" + dentalCOST, false);
   JCheckBox visionBox = new JCheckBox("Vision coverage is an additional $" + visionCOST, false);

   JLabel selectLabel = new JLabel("Select additional coverage");
   JLabel selectPrice = new JLabel("The cost for your additional coverage is ");
   JTextField totalPrice = new JTextField(5);
   JLabel optionExplainLabel = new JLabel("The total cost is $ " + totalCost + ".");
   JLabel optionExplainLabel2 = new JLabel("Check the options you want.");

   public JInsurance()
   {
      super("Insurance Calculator");
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setLayout(new FlowLayout());
      add(selectLabel);
      add(optionExplainLabel);
      add(optionExplainLabel2);
      add(hmoBox);
      add(ppoBox);
      add(dentalBox);
      add(visionBox);
      add(selectLabel);
      add(totalPrice);

      totalPrice.setText("$" + totalCost);
      hmoBox.addItemListener(this);
      ppoBox.addItemListener(this); 
      dentalBox.addItemListener(this);
      visionBox.addItemListener(this);
    }
   public void itemStateChanged(ItemEvent event)
   {
      Object source = event.getSource();
      int select = event.getStateChange();

      if(source == hmoBox)
      if(select == ItemEvent.SELECTED)
      grandTotal += hmoCOST;
      else
      grandTotal -= hmoCOST;
      else if(source == ppoBox)
      {
      if(select == ItemEvent.SELECTED)
      grandTotal += ppoCOST;
      else
      grandTotal -= ppoCOST;
      }
      else 
      if(select == ItemEvent.SELECTED)
      grandTotal += dentalCOST;
      else
      grandTotal -= dentalCOST;
      }
      else
      if(select == ItemEvent.SELECTED)
      grandTotal += visionCOST;
      else
      grandTotal -= visionCOST;
      totalCost.setText("$" + grandTotal);
      public static void main(String[] args)
      {
      JInsurance aFrame = new JInsurance();
        final int WIDTH = 450;
        final int HEIGHT = 400;
        aFrame.setSize(WIDTH, HEIGHT);
        aFrame.setVisible(true);
      }
}
}

这是我的错误

JInsurance.java:69：错误：非法启动类型其他 ^ JInsurance.java:69：错误：';'预期其他 ^ JInsurance.java:70：错误：非法启动类型 if（select == ItemEvent.SELECTED） ^ JInsurance.java:70：错误：';'预期 if（select == ItemEvent.SELECTED） ^ JInsurance.java:70：错误：预期 if（select == ItemEvent.SELECTED） ^ JInsurance.java:71：错误：预期 grandTotal + = visionCOST; ^ JInsurance.java:72：错误：非法启动类型其他 ^ JInsurance.java:72：错误：';'预期其他 ^ JInsurance.java:73：错误：非法启动类型 grandTotal - = visionCOST; ^ JInsurance.java:74：错误：预期 totalCost.setText（“$”+ grandTotal）; ^ JInsurance.java:74：错误：非法启动类型 totalCost.setText（“$”+ grandTotal）; ^ JInsurance.java:74：错误：'）'预期 totalCost.setText（“$”+ grandTotal）; ^ JInsurance.java:74：错误：';'预期 totalCost.setText（“$”+ grandTotal）; ^ JInsurance.java:74：错误：非法启动类型 totalCost.setText（“$”+ grandTotal）; ^ JInsurance.java:74：错误：预期 totalCost.setText（“$”+ grandTotal）; ^ JInsurance.java:74：错误：';'预期 totalCost.setText（“$”+ grandTotal）; ^ JInsurance.java:84：错误：类，接口或枚举预期} ^ 17错误

Answer 1

使用下面的代码可以解决您的问题

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*;

public class JInsurance extends JFrame implements ItemListener 
{
   final int hmoCOST = 200;
   final int ppoCOST = 600;
   final int dentalCOST = 75;
   final int visionCOST = 20;
   int totalCost = 0;
   int grandTotal = totalCost;

   JCheckBox hmoBox = new JCheckBox("HMO cost per month is $" + hmoCOST, false);
   JCheckBox ppoBox = new JCheckBox("PPO cost per month is $" + ppoCOST, false);
   JCheckBox dentalBox = new JCheckBox("Dental coverage is an additional $" + dentalCOST, false);
   JCheckBox visionBox = new JCheckBox("Vision coverage is an additional $" + visionCOST, false);

   JLabel selectLabel = new JLabel("Select additional coverage");
   JLabel selectPrice = new JLabel("The cost for your additional coverage is ");
   JTextField totalPrice = new JTextField(5);
   JLabel optionExplainLabel = new JLabel("The total cost is $ " + totalCost + ".");
   JLabel optionExplainLabel2 = new JLabel("Check the options you want.");

   public JInsurance()
   {
      super("Insurance Calculator");
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setLayout(new FlowLayout());
      add(selectLabel);
      add(optionExplainLabel);
      add(optionExplainLabel2);
      add(hmoBox);
      add(ppoBox);
      add(dentalBox);
      add(visionBox);
      add(selectLabel);
      add(totalPrice);

      totalPrice.setText("$" + totalCost);
      hmoBox.addItemListener(this);
      ppoBox.addItemListener(this); 
      dentalBox.addItemListener(this);
      visionBox.addItemListener(this);
    }
   public void itemStateChanged(ItemEvent event)
   {
      Object source = event.getSource();
      int select = event.getStateChange();

      if(source == hmoBox)
      if(select == ItemEvent.SELECTED)
      grandTotal += hmoCOST;
      else
      grandTotal -= hmoCOST;
      else if(source == ppoBox)
      {
      if(select == ItemEvent.SELECTED)
      grandTotal += ppoCOST;
      else
      grandTotal -= ppoCOST;
      }
      else 
      if(select == ItemEvent.SELECTED)
      grandTotal += dentalCOST;
      else
      grandTotal -= dentalCOST;
      }
      else
      if(select == ItemEvent.SELECTED)
      grandTotal += visionCOST;
      else
      grandTotal -= visionCOST;
      totalCost.setText("$" + grandTotal);
}      
public static void main(String[] args)
      {
      JInsurance aFrame = new JInsurance();
        final int WIDTH = 450;
        final int HEIGHT = 400;
        aFrame.setSize(WIDTH, HEIGHT);
        aFrame.setVisible(true);
      }
}

Answer 2

首先，将main方法移出itemStateChanged方法。

调试问题，不确定如何修复

2 个答案: