我应该在哪里放置未知的'}'？ [英] Where should I place the unknown '}' ?

问题描述

我已经尝试了很多时间来放置'}'，但错误不断出现。那么，我应该把最后一个'}'放在哪里？



我尝试了什么：

  import  java.text。*; 
  import  javax.swing.JLabel; 
  import  java.awt.BorderLayout; 
  import  java.awt。*; 
  import  java.awt.event。*; 
  import  java.awt.event.ActionEvent; 
  import  java.awt.event.ActionListener; 
  import  javax.swing。*; 
  import  javax.swing.border.TitledBorder; 
  public   class  PizzaOrderForm  extends  JFrame  implements  ActionListener {
  double  sizeCost，toppingCost，amount; 
 字符串 msg =  ; 
 JButton B，B1; 
 JLabel L，L1，L2，L3，L4，L5，L6，L7，L8; 
 JRadioButton RB，RB1，RB2; 
 ButtonGroup buttonGroup =  new  ButtonGroup（）; 
 JCheckBox C，C1，C2，C3，C4，C5; 
 DecimalFormat twoDigits; 
 
  public  PizzaOrderForm（）
 {
 JPanel panel =  new  JPanel（）; 
 L =  new  JLabel（  MAMA MIA Pizzaria吗）; 
 L.setSize（ 500 ， 600 ）; 
 L.setFont（ new 字体（  Serif，Font.BOLD， 30 ））; 
 panel.add（L）; 
 add（panel，BorderLayout.NORTH）; 
 
 JPanel panel1 =  new  JPanel（）; 
 panel1.setLayout（ new  GridLayout（ 4 ， 2 ））; 
 L1 =  new  JLabel（ 小： ）; 
 L2 =  new  JLabel（  $ 4.99 ）; 
 L3 =  new  JLabel（ 中： ）; 
 L4 =  new  JLabel（  $ 6.99 ）; 
 L5 =  new  JLabel（ 大： ）; 
 L6 =  new  JLabel（  $ 8.99 ）; 
 L7 =  new  JLabel（  Toppings： ）; 
 L8 =  new  JLabel（ 每个$ 0.50 ）; 
 panel1.add（L1）; 
 panel1.add（L2）; 
 panel1.add（L3）; 
 panel1.add（L4）; 
 panel1.add（L5）; 
 panel1.add（L6）; 
 panel1.add（L7）; 
 panel1.add（L8）; 
 add（panel1，BorderLayout.WEST）; 
 
 JPanel panel2 =  new  JPanel（）; 
 panel2.setLayout（ new  GridLayout（ 4 ， 1 ））; 
 TitledBorder T =  new  TitledBorder（  Size ）; 
 RB =  new  JRadioButton（  Small ）; 
 RB1 =  new  JRadioButton（  Medium ）; 
 RB2 =  new  JRadioButton（  Large ）; 
 buttonGroup.add（RB）; 
 buttonGroup.add（RB1）; 
 buttonGroup.add（RB2）; 
 panel2.setBorder（T）; 
 panel2.add（RB）; 
 panel2.add（RB1）; 
 panel2.add（RB2）; 
 add（panel2，BorderLayout.CENTER）; 
 
 JPanel panel3 =  new  JPanel（）; 
 panel3.setLayout（ new  FlowLayout（FlowLayout.CENTER， 1 ， 2 ））; 
 B =  new  JButton（  Calculate ）; 
 B1 =  new  JButton（ 退出 ）; 
 panel3.add（B）; 
 panel3.add（B1）; 
 add（panel3，BorderLayout.SOUTH）; 
 B.addActionListener（ this ）; 
 B1.addActionListener（ new  ButtonListener（））; 
 
 JPanel panel4 =  new  JPanel（）; 
 panel4.setLayout（ new  GridLayout（ 7 ， 1 ））; 
 TitledBorder T1 =  new  TitledBorder（  Toppings ）; 
 C =  new  JCheckBox（  Pepperoni ）; 
 C1 =  new  JCheckBox（ 意大利香肠）; 
 C2 =  new  JCheckBox（  Pineapple ）; 
 C3 =  new  JCheckBox（  Extra Cheese ）; 
 C4 =  new  JCheckBox（ 青椒）; 
 C5 =  new  JCheckBox（  Olived ）; 
 
 panel4.setBorder（T1）; 
 panel4.add（C）; 
 panel4.add（C1）; 
 panel4.add（C2）; 
 panel4.add（C3）; 
 panel4.add（C4）; 
 panel4.add（C5）; 
 add（panel4，BorderLayout.EAST）; 
} 
 
  public   void  actionPerformed（ActionEvent e）{
 
  public   double  sizeCost（）
 {
 < span class =code-keyword> if （RB.isSelected（））{
  return  sizeCost =  4 。 99 ; 
} 
  else   if （RB1.isSelected（））{
  return  sizeCost =  6 。 99 ; 
} 
  else   if （RB2.isSelected（））{
  return  sizeCost =  4 。 99 ; 
} 
  return  sizeCost; 
} 
 
  public   double  toppingCost（）
 {
  if （C.isSelected（））{
 toppingCost + =  0  。 50 ; 
} 
  else   if （C1.isSelected（））{
 toppingCost + =  0 。 50 ; 
} 
  else   if （C2.isSelected（））{
 toppingCost + =  0 。 50 ; 
} 
  else   if （C3.isSelected（））{
 toppingCost + =  0 。 50 ; 
} 
  else   if （C4.isSelected（））{
 toppingCost + =  0 。 50 ; 
} 
  else   if （C5.isSelected（））{
 toppingCost + =  0 。 50 ; 
} 
  return  toppingCost; 
} 
  public   void  calculate（ double  sizeCost， double  toppingCost）
 {
 
 amount = sizeCost + toppingCost; 
 JOptionPane.showMessageDialog（ this ，msg +  总计： +金额）; 
 
} 
 
  public   static   void  main（ String  [] args）
 {
 PizzaOrderForm frame =  new  PizzaOrderForm（）; 
 frame.setSize（ 500 ， 300 ）; 
 frame.setResizable（false）; 
 frame.setLocationRelativeTo（null）;  //  框架中心 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 frame.setVisible（true）; 
} 
} 
 类 ButtonListener  implements  ActionListener 
 {
  public   void  actionPerformed（ActionEvent evt）
 {
 System .exit（ 0 ）; 
} 
} 

解决方案

4.99）;
L3 = new JLabel（ Medium：）;
L4 = new JLabel（

6.99）;
L5 = new JLabel（ 大：）;
L6 = new JLabel（

8.99）;
L7 = new JLabel（ Toppings：）;
L8 = new JLabel（

I've tried so many time to where to put the '}' but error keeps coming out. So, where should I place the last '}' ?

What I have tried:

import java.text.*;
import javax.swing.JLabel;
import java.awt.BorderLayout;
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.border.TitledBorder;
public class PizzaOrderForm extends JFrame implements ActionListener {
    double sizeCost, toppingCost, amount;
    String msg = "";
    JButton B,B1;
    JLabel L, L1, L2,L3,L4,L5,L6,L7,L8;
    JRadioButton RB,RB1,RB2;
    ButtonGroup buttonGroup = new ButtonGroup();
    JCheckBox C,C1,C2,C3,C4,C5;
    DecimalFormat twoDigits;

    public PizzaOrderForm()
   {
    JPanel panel = new JPanel();
    L = new JLabel("MAMA MIA PIZZARIA");
    L.setSize(500,600);
    L.setFont(new Font("Serif",Font.BOLD,30));
    panel.add(L);
    add(panel,BorderLayout.NORTH);
    
    JPanel panel1 = new JPanel();
    panel1.setLayout(new GridLayout(4,2));
    L1 = new JLabel("Small:");
    L2 = new JLabel("$4.99");
    L3 = new JLabel("Medium:");
    L4 = new JLabel("$6.99");
    L5 = new JLabel("Large:");
    L6 = new JLabel("$8.99");
    L7 = new JLabel("Toppings:");
    L8 = new JLabel("$0.50 each");
    panel1.add(L1);
    panel1.add(L2);
    panel1.add(L3);
    panel1.add(L4);
    panel1.add(L5);
    panel1.add(L6);
    panel1.add(L7);
    panel1.add(L8);
    add(panel1,BorderLayout.WEST);
    
    JPanel panel2 = new JPanel();
    panel2.setLayout(new GridLayout(4,1));
    TitledBorder T = new TitledBorder("Size");
    RB = new JRadioButton("Small");
    RB1 = new JRadioButton("Medium");
    RB2 = new JRadioButton("Large");
    buttonGroup.add(RB);
    buttonGroup.add(RB1);
    buttonGroup.add(RB2);
    panel2.setBorder(T);
    panel2.add(RB);
    panel2.add(RB1);
    panel2.add(RB2);
    add(panel2,BorderLayout.CENTER);
    
    JPanel panel3 = new JPanel();
    panel3.setLayout(new FlowLayout(FlowLayout.CENTER,1,2));
    B = new JButton("Calculate");
    B1 = new JButton("Exit");
    panel3.add(B);
    panel3.add(B1);
    add(panel3,BorderLayout.SOUTH);
    B.addActionListener(this);
    B1.addActionListener(new ButtonListener());
    
    JPanel panel4 = new JPanel();
    panel4.setLayout(new GridLayout(7,1));
    TitledBorder T1 = new TitledBorder("Toppings");
    C = new JCheckBox("Pepperoni");
    C1 = new JCheckBox("Italian Sausage");
    C2 = new JCheckBox("Pineapple");
    C3 = new JCheckBox("Extra Cheese");
    C4 = new JCheckBox("Green Pepper");
    C5 = new JCheckBox("Olived");
    
    panel4.setBorder(T1);
    panel4.add(C);
    panel4.add(C1);
    panel4.add(C2);
    panel4.add(C3);
    panel4.add(C4);
    panel4.add(C5);
    add(panel4,BorderLayout.EAST);
}

public void actionPerformed(ActionEvent e){

    public double sizeCost() 
    {
        if(RB.isSelected()){ 
        return sizeCost = 4.99; 
        }  
        else if(RB1.isSelected()){  
        return sizeCost = 6.99;   
        }  
        else if(RB2.isSelected()){  
        return sizeCost = 4.99;  
        }
        return sizeCost;
    }
        
    public double toppingCost()
    {
        if(C.isSelected()){ 
            toppingCost += 0.50;
        } 
        else if(C1.isSelected()){ 
            toppingCost += 0.50;
        }
        else if(C2.isSelected()){ 
            toppingCost += 0.50;
        }
        else if(C3.isSelected()){ 
            toppingCost += 0.50;
        }
        else if(C4.isSelected()){ 
            toppingCost += 0.50;
        }
        else if(C5.isSelected()){ 
            toppingCost += 0.50;
        }
        return toppingCost;
    }
public void calculate (double sizeCost, double toppingCost)
{

	amount = sizeCost + toppingCost;
        JOptionPane.showMessageDialog(this, msg+"Total: "+amount); 
        
}

    public static void main(String[]args)
    {
        PizzaOrderForm frame = new PizzaOrderForm();
        frame.setSize(500,300);
        frame.setResizable(false);
        frame.setLocationRelativeTo(null); // center the frame
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}
class ButtonListener implements ActionListener
{
    public void actionPerformed(ActionEvent evt)
    {
       System.exit(0);
    }
}

解决方案

4.99"); L3 = new JLabel("Medium:"); L4 = new JLabel("

6.99"); L5 = new JLabel("Large:"); L6 = new JLabel("

8.99"); L7 = new JLabel("Toppings:"); L8 = new JLabel("

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