如何把这个程序放在 Jframe 上？ [关闭]

Question

我在如何将这个程序放在 JFrame 上时遇到了麻烦。我不确定该怎么做。如果有人给我一些帮助，那就太好了。非常感谢，我很感激。帮助任何人：/？

   package VendMach;

import java.util.Scanner;

import javax.swing.JComponent;
 import javax.swing.JOptionPane;
import javax.swing.JFrame;

public class VendMachMain extends JComponent {

public static class groceryshopping{
    public static void main(String args[]){

        Scanner input = new Scanner(System.in);

        int choice = 1;
        double subtotal = 0;
        double price = 0;
        double discount = 0;

    do {    
        System.out.println( "Quick Deli" + "\n" +"1. Lunchables             $ 1.99 per   box" + 
    "\n" + "2. Chips                $ 0.99 per bag" + "\n" + "3. Chocolate Bars     $ 0.99 each" + "\n" + 
    "4. Soda                $ 0.99 a can" + "\n" + "5. Cold Cut Sandwiches  $ 2.99 each" + "\n" + "6. Apple Slices          $ 0.75 per bag" + 
    "\n" + "7. Juice Boxes          $ 0.99 each" + "\n" + "8. Cinnabons         $ 0.99 each" + "\n" + "9. Cookies               $ 1.99 per bag" +
    "\n" + "10.Gum                  $ 1.15 per pack" + "\n" + " " + "\n" + "0. Quit" + "\n" + " " + "\n" + "Your subtotal is $ " +(int)(subtotal * 100) / 100.0 
    + "\n" );

        System.out.println("What would you like to purchase?  \nIf you have completed your checkout, enter 0.");
            choice = input.nextInt();


    if (choice == 0)
        break;

        System.out.println("How many do you want?");
        int qty = input.nextInt();

        switch (choice)    {
            case 1:
                price = 1.99;
                break;
            case 2:
                price = 0.99;                        
                break;
            case 3:
                price = 0.99;
                break;
            case 4:
                price = 0.99;
                break;
            case 5:
                price = 2.99;
                break;
            case 6:
                price = 0.75;
                break;
            case 7:
                price = 0.99;
                break;
            case 8:
                price = 0.99;
                break;
            case 9:
                price = 1.99;
                break;
            case 10:
                price = 1.15;
        }        
            subtotal = subtotal + (qty * price);
        }

        while(choice > 0);

        System.out.println("Do you have the special discount card? (Y/N)");
            String discountInput = input.next();
        char discountClub = discountInput.charAt(0);    

        if (discountClub == 'y' || discountClub == 'Y'){
            discount = subtotal * .20;
        }    

        double tax = ((subtotal - discount) * 0.075); 
        double finalCost = subtotal - discount + tax;

        JOptionPane.showMessageDialog(null,"The subtotal is $ " + (int)(subtotal * 100) / 100.0 + "\n" + "Discount $ " + (int) (discount * 100) / 100.0 
+ "\n" + "Tax $ " + (int)(tax* 100) / 100.0 + "\n" + "Total price $ " + (int)(finalCost * 100) /  100.0);
    }
}
}

Answer 1

除了在 eclipse fx 中使用“windowbuilder”之类的东西来使它们具有图形界面外，没有其他快捷方式。但是您仍然需要了解用于以您想要的方式操作它们的许多项目的逻辑。

我建议您阅读教程并至少学习基础知识（编程没有捷径）。

像这样的效果： http://www.fortystones.com/creating-simple-gui-beginners-java-tutorial/

Answer 2

我很确定你可以这样做：

public class vendMachMain extends Jpanel;

后来

    public static void main(String[] args){
    true means that the jpanel will be fullscreen, false means it will not.
    makeJPanel(true);
    } 

    public static void makeJPanel(boolean FullScreen){
    JFrame fr = new JFrame();
    //what are the dimensions of this screen?
    Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
    //STATIC VARS
    CanvasWidth = (int) dim.getWidth();
    CanvasHeight = (int) dim.getHeight();
    fr.setSize(CanvasWidth, CanvasHeight );
    fr.setExtendedState(JFrame.MAXIMIZED_BOTH);
    fr.setUndecorated(FullScreen);
    //get a 'device' object--whatever that is...
    GraphicsDevice device     GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()[0];
    device.setFullScreenWindow(fr);
    vendMachMain vmm = new vendMachMain();
    vmm.setSize(CanvasWidth, CanvasHeight);
    fr.add(vmm);
    fr.setVisible(true);
    fr.setResizable(!FullScreen);
    }

然后把这部分的所有代码放在super.addnotify之后

     public void addNotify(){
    super.addNotify();
    //All of your code goes here. The best part is since it is not in main, 
    //you can use NON STATIC VARIABLES YAY

     } 
     }

Answer 3

只需简单地创建一个JFrame，设置它并将作为JComponent 的类本身添加到JFrame 中，例如：

JFrame frame = new JFrame();
frame.setSize(width, height);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(True);
frame.getContentPane().add(this);

说你的程序还有很多错误需要你先解决。如果您想在JFrame 上输出和输入，那么System.out.println() 将不起作用，Scanner 也不起作用，您必须为用户添加一些 GUI（例如，JTextField 用于输入或JLabel 用于输出）。