从六个中打印一个随机答案

Question

当我一次只想要一个答案时,我的代码会打印出多个答案,你能帮我一次只打印一个吗？

我也想要帮助,这样当它运行时,你可以按下一个按钮,刷新页面,产生一个新的问题,无论如何.

package ScienceRevision;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.util.Random;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Image extends JFrame {


    Font font = new Font("Arial", Font.BOLD | Font.ITALIC, 30 );
    public Image(){

        //Game Properties
        setTitle("WheelOP");
        //setSize(750, 750);
        setResizable(false);

        setBackground(Color.CYAN);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }




    public void paint(Graphics g){
        g.setFont(font);
        g.setColor(Color.RED);

        Random rand = new Random();
        int result = rand.nextInt(6);
        if (result == 0){
        g.drawString("Cell Wall Definition", 100, 100 );
        }
        else if (result == 1){
        g.drawString("Vacuole Definition", 100, 100 );
        }
        else if (result == 2){
        g.drawString("Choroplast Definition", 100, 100 );
        }
        else if (result == 3){
        g.drawString("Nucleus Definition", 100, 100 );
        }
        else if (result == 4){
        g.drawString("Cell Membrane Definition", 100, 100 );
        }
        else if (result == 5){
        g.drawString("Cytoplasm Definition", 100, 100 );
        }
}





    public void paintcomponent (Graphics g){

}
    public static void main(String[] args){
        JFrame jframe = new Image();
        jframe.setSize(750,750);
        jframe.setVisible(true);
        jframe.getContentPane().setBackground(Color.CYAN);
        jframe.setVisible(true);
    }

Answer 1

调用JFrame.setSize将调用该paint方法。初始化后设置大小并将其从构造函数中删除。

//Game Properties
setTitle("WheelOP");
//setSize(750, 750);
setResizable(false);
setVisible(true);
setBackground(Color.CYAN);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 public static void main(String[] args){
        JFrame image = new Image();
        image.setSize(750,750);
    }

希望这可以帮助。

编辑： 您还应该将背景颜色设置为内容窗格而不是实际框架。完成所有这些操作后，我们应该将其设置为可见。所以它看起来像这样：

public static void main(String[] args){
    JFrame jframe = new Image();
    jframe.setSize(750,750);
    jframe.getContentPane().setBackground(Color.CYAN);
    jframe.setVisible(true);
}