Graphics2d和Jpanel

Question

我有JFrame與一些組件和JPanel在哪裏將是圖形對象。 我想補充線路上的JPanel

DrawingPanel() 
{ 
    DrawCellsComponent drawCellsComponent = new DrawCellsComponent(); 
    add(drawCellsComponent); 
} 

這裏是組件的代碼。

public void paintConponent(Graphics g) 
{ 
    Graphics2D g2 = (Graphics2D) g; 
    g2.setPaint(Color.RED); 
    g2.draw(new Line2D.Double(0, 0, 250, 250)); 
} 

JPanel上沒有任何Line。有什麼問題？

Answer 1

問題解決。只需在JPanel中繪製不在JComponent中