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我試圖做交替顏色的靶心,但每次運行這段代碼時,我都會得到一種統一的顏色。我嘗試在for循環結束時使用repaint(),但它沒有幫助。交替顏色的靶心
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Unit5Activity1 extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Color color1 = new Color(100, 199, 100);
Color color2 = new Color(208, 180, 45);
for(int i = 5; i > 0; i--){
if(i == 1 || i == 3 || i == 5) {
g.setColor(color1);
g.fillOval(250 + i*25, 250 + i*25, 250 - 50*i, 250 - 50*i);
}
else if(i == 2 || i == 4){
g.setColor(color2);
g.fillOval(250 + i*25, 250 + i*25, 250 - 50*i, 250 - 50*i);
}
}
}
public static void main(String[] args){
Unit5Activity1 panel = new Unit5Activity1();
JFrame application = new JFrame();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
application.add(panel);
application.setSize(500, 500);
application.setVisible(true);
}//main
}//class