java - 将文本添加到 JFrame

Question

我是java初学者，我使用JFrame制作了一个彩票系统，该系统打开一个窗口，让您单击“玩”按钮来运行彩票。目前，您的奖金和号码显示在控制台中，因为我一直无法找到在 JFrame 中显示文本的方法，尽管我进行了大量搜索，但我总是遇到无法修复的错误，或者根本没有得到任何工作结果。 (如前所述，我是初学者)

我想要实现的基本上是一张表格或一段文本，告诉您可能的奖金以及哪些数字将带来哪些奖金。每次按下“玩”按钮后，还会显示您的号码和奖金的区域。

我并不是在寻找任何 super 花哨的东西，只是在寻找基本有效的东西，因为我是初学者。

这就是现在的样子:

http://i.gyazo.com/1ffda0067a033bd6d5fd92dbf6bc8fed.png

系统由 2 个文件组成，它们如下所示:

LotteryMain.java

public class LotteryMain {
/**
 **@author Samy
 */
public static void main(String[] args) {

    TheLottery n = new TheLottery();
    n.TheLottery();

}
}

TheLottery.java

import java.awt.FlowLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TheLottery extends JFrame implements ActionListener {
/**
 **author Samy
 */
JFrame frame = new JFrame("The Lottery");
JPanel panel = new JPanel(new FlowLayout());
JButton play = new JButton("Play");

private static final long serialVersionUID = 1L;



public void TheLottery() {




    int width = 720;
    int height = width/16*9;

    frame.setVisible(true);
    frame.setSize(width,height);
    frame.setResizable(false);
    frame.setLocationRelativeTo(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.add(panel);

    panel.add(play);



    play.addActionListener(this);


    play.setToolTipText("Click me to play the lottery!");




}


@Override
public void actionPerformed(ActionEvent e) {

    Object action = e.getSource();

    String winnings;
    double lotteryChance = Math.random()*100;

    if(action == play) {

        if (lotteryChance > 50) {
            winnings = ("You've won $100!");
        } else if (lotteryChance < 50 && lotteryChance > 20) {
            winnings = ("You've won $500!");
        } else if (lotteryChance < 20 && lotteryChance > 5) {
            winnings = ("You've won $2,000!");
        } else if (lotteryChance < 5 && lotteryChance > 1) {
            winnings = ("You've won $5,000!");
        } else if (lotteryChance < 1 && lotteryChance > 0.1) {
            winnings = ("You've won $25,000!");
        } else if (lotteryChance < 0.1 && lotteryChance > 0.01) {
            winnings = ("You've won $50,000!");
        } else if (lotteryChance < 0.01 && lotteryChance > 0.001) {
            winnings = ("You've won $250,000!");
        } else if (lotteryChance < 0.001 && lotteryChance > 0) {
            winnings = ("YOU'VE WON THE JACKPOT! $1,000,000!!!");
        } else winnings = ("Something went wrong, no winnings this round.");

        System.out.println("Your number is: "+lotteryChance);
        System.out.println(winnings);

    }   
}
}

预先感谢您的帮助!

编辑:如何添加一段每次运行彩票时都会更改的文本？

Answer 1

我认为你想要的是 JLabel

JLabels 显示一些由您定义的文本:

String winnings = "You've won $200!";
JLabel label = new JLabel(winnings);
panel.add(label);

然后，每当奖金发生变化时，您都可以像这样更新它:

winnings = "You've won $1,000"; // Winnings changed
label.setText(winnings);