如何在點擊某個物體上的鼠標後在屏幕上打印某些內容？

Question

所以我一直在用鼠標點擊一個對象，然後用鼠標點擊的方法在屏幕上畫出一條線來嘗試打印線條。我從繪製元素的數組中填充元素。這是我的代碼：

ShapeSh s = new VertexG(x,y,Window.graph2); 
    ((VertexG) s).addMouseListener(new MouseAdapter() { 
     public void mouseEntered(MouseEvent e){ 
      ShapeSh z = (VertexG)e.getSource(); 
      System.out.println("some text"); 
     } 
    }); 

不打印「某些文字」。我究竟做錯了什麼？ :(這是我如何從數組繪圖元素：

protected void paintComponent(Graphics g) { 

    super.paintComponent(g); 
    for(ShapeSh shape: drawingList){ 
     shape.drawThis(g); 
    } 
} 

public void drawThis(Graphics g){  

    g.setColor(c); 
    g.fillOval(x,y,2*radius,2*radius); 
    g.setFont(f); 
    g.setColor(c2); 
    g.drawString(value, x-8, y-8); 

} 

Answer 1

如果你想要做的事點擊鼠標時，試試這個mehtond「的mousePressed（的MouseEvent E）」而不是「的mouseEntered（的MouseEvent E）」

。

試試這一個私人MouseClickListener

private class MapMouseClickListener implements MouseInputListener { 

    @Override 
    public void mouseClicked(MouseEvent e) { 

     int clickButtonType = e.getButton(); 
     // BUTTON3 is the right mouse button. 
     if (clickButtonType == MouseEvent.BUTTON3) { 
      System.out.println("some text");// and whatever you want to active. 
     } 
    } 

    @Override 
    public void mouseEntered(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseExited(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mousePressed(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseReleased(MouseEvent e) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseDragged(MouseEvent arg0) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void mouseMoved(MouseEvent arg0) { 
     // TODO Auto-generated method stub 

    } 
}