我正在考虑如何创建它,我可以System.out.println
在一个线程上创建它,它运行良好,但是,我正在询问如何使用该方法每秒显示随机数据Graphics2D
,任何人都可以提供帮助吗?
这是我所做的:
String[] numbers= {"1","2", "3", "4", "5", "6", "7", "8", "9", "10"};
int random = (int) (Math.random()*numbers.length);
//here's the part I struggle
public void paint (Graphics g) {
g2.setColor(Color.black);
g2.drawString("The number is below", 50, 70);
//won't run
g2.draw(numbers, 50, 90);
}
您可以创建一个面板,生成一个从最小值到最大值的随机数。
首先,这是不正确的。drawString
在此之前,您在通话中正确使用了。
g2.draw(numbers, 50, 90); // draw is not a method of Graphics2D
其次,除非您的数组不是整数,否则您可以按原样显示随机值。
String.format("%d", getRandomInteger()) // Display a random number as a string
最后,在JComponent
(swing) 中,您必须覆盖paintComponent
not paint
。在您的示例中,您可以只使用标准图形 ( g.drawString
)。
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g; // Optional, has more methods
}
import java.awt.*;
import javax.swing.*;
public class RandomNumberPanel extends JPanel {
private static final long serialVersionUID = -4376447503776020320L;
private int min;
private int max;
public RandomNumberPanel() {
this(0, 10);
}
public RandomNumberPanel(int max) {
this(0, max);
}
public RandomNumberPanel(int min, int max) {
this.min = min;
this.max = max;
}
public int getRandomInteger() {
return getRandomInteger(min, max);
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.BLACK);
g2.drawString("The number is below", this.getWidth() / 4, this.getHeight() / 3);
g2.drawString(String.format("%d", getRandomInteger()), this.getWidth() / 2, this.getHeight() / 2);
}
public static final int getRandomInteger(final int max, final int min) {
return ((int) (Math.random() * (max - min))) + min;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame mainFrame = new JFrame();
JPanel panel = new RandomNumberPanel(1, 10); // [1, 10]
panel.setPreferredSize(new Dimension(200, 100));
mainFrame.setContentPane(panel);
mainFrame.pack();
mainFrame.setLocationRelativeTo(null);
mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mainFrame.setVisible(true);
}
});
}
}
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