我想返回主菜单，但我不想制作一百万个返回按钮，而是想做一个 if 语句，该语句表示如果类方法=所有这些类，它将返回主菜单，我该怎么做那？
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Container;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.event.*;
public class How_wants_to_be_a_millionaire extends JFrame implements ActionListener
{
JFrame start_Frame, help_Frame, quit_Frame, bstart;
Container bstartCon, helpCon, thisContainer3, thisContainer4, thisContainer5, thisContainer6;
JPanel centerPanel, southPanel, northPanel, midPanel, topPanel, downPanel, quitup, quitdown, donateup, donatedown, helptop, helpdown;
JButton start_button, help_button, quit_button, extra_button, return_bs;
String L1 = "Welcome to the Game!";
String L2 = "This a multiple choise game, player would have a question and 4 choises, only one is the correct one";
String L3 = "When players reache a certent amount of money, they could choose to leave or continue playing";
String L4 = "When players choose to continue playing,";
String L5 = "The money beyond that point will not be saved until it reaches the next check point";
String L6 = "Player have 3 assist that could help, they could only used once, they are 50:50, Phone assist and addience assist";
String L7 = "50:50 eliminates 2 false answers, Phone assist is to call anyone in 30 sec to help you,";
String L8 = "Addience assist is to perform a vote live to give a preferce of what people think the answer is";
JLabel help_Line = new JLabel ("<html>" + L1 + "<br>" + L2 + "<br>" + L3 + "<br>" + L4 + "<br>" + L5 + "<br>" + L6 + "<br>" + L7 + "<br>" + L8 + "</html>");
Font font = (new Font ("Font", Font.PLAIN, 14));
public void before_we_start_menu ()
{
bstart = new JFrame ("How Wants to be a millionaire?(Guide Menu)");
bstart.setBounds (100, 100, 450, 150);
bstartCon = bstart.getContentPane ();
bstartCon.setLayout (new BorderLayout ());
midPanel = new JPanel ();
midPanel.setBackground (Color.BLACK);
topPanel = new JPanel ();
topPanel.setBackground (Color.BLACK);
downPanel = new JPanel ();
downPanel.setBackground (Color.BLACK);
bstartCon.add (midPanel, "Center");
bstartCon.add (downPanel, "South");
bstartCon.add (topPanel, "North");
start_button = new JButton ("Start");
start_button.addActionListener (this);
topPanel.add (start_button);
help_button = new JButton ("Help/Rules");
help_button.addActionListener (this);
midPanel.add (help_button);
extra_button = new JButton ("Extra");
extra_button.addActionListener (this);
midPanel.add (extra_button);
quit_button = new JButton ("Quit");
quit_button.addActionListener (this);
downPanel.add (quit_button);
bstart.setVisible (true);
bstart.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
}
public void help ()
{
help_Frame = new JFrame ("Help/Rules");
help_Frame.setBounds (350, 350, 500, 350);
helpCon = help_Frame.getContentPane ();
helpCon.setLayout (new BorderLayout ());
helpdown = new JPanel ();
helpCon.add (helpdown, "South");
help_Line.setFont (font);
helpCon.add (help_Line);
return_bs = new JButton ("Back");
return_bs.setFont (font);
return_bs.setForeground (new Color (0xffffdd));
helpdown.add (return_bs);
return_bs.addActionListener (this);
help_Frame.setVisible (true);
help_Frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed (ActionEvent event)
{
if (event.getSource () == help_button)
{
help ();
bstart.setVisible (false);
}
if (event.getSource () == quit_button)
{
System.exit (0);
}
if (event.getSource () == return_bs)
{
before_we_start_menu ();
if (class=help ())//This is where i wanted help
help.setVisible (false);
}
}
public static void main (String[] args)
{
How_wants_to_be_a_millionaire c = new How_wants_to_be_a_millionaire ();
c.before_we_start_menu ();
}
}
最佳答案
假设我的问题是正确的，并且您想为给定类型的所有类提供特定的功能 - 您可能可以让这些类实现“标记”接口(interface)，然后让您的代码检查调用类是否是该类的实例市场。
关于java - 如何制作带有类的 if 语句(java)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28008515/