我试图在使用重绘方法选择文件后显示图形,它没有向我提供任何错误但是我做错了它没有显示图形,我是新来的油漆方法,所以我认为这就是为什么它不起作用。
代码:
private final JPanel graphArea = new JPanel();
private final JButton read = new PosJButton("Read", 0);
private final JButton breadth = new PosJButton("Breadth", 0);
private final JButton depth = new PosJButton("Depth", 0);
以下是我试图输出图表的JPanel:
private class graphArea extends JPanel {
public graphArea() {
graphArea.setPreferredSize(new Dimension(255,255));
}
@Override
public void paintComponent(Graphics g) {
}
}
//method creating a new gui
public static void makeAndShowGUI() {
graphGUI gGUI = new graphGUI();
gGUI.showGUI();
}
//setting items for gui
yout);
listArea.setRows(1);
);
contentPane.add(buttonPanel);
contentPane.add(graphArea);
newStation.addStation(name, posx, posy);
System.out.println("Station test: " + name + " " + posx + " " + posy);
}
else if(type.equals("Connection:")){
String statA = sc.next();
String statB = sc.next();
double dist = sc.nextDouble();
newStation.addConnection(statA, statB, dist);
System.out.println("Connection test: " + statA + " " + statB + " " + dist);
}
}
我重新粉刷小组的课程:
graphArea.repaint();
}catch(FileNotFoundException ex){
JOptionPane.showMessageDialog(null, "invalid file format", "Error", JOptionPane.ERROR_MESSAGE);
}
}
}
});
这是我尝试重新绘制jpanel graphArea的地方:
inv_id inv_date inv_export inv_code
1 2016-03-14 0 a2
2 2016-03-13 0 a1
3 2016-04-13 1 a1
4 2016-03-14 0 a1
答案 0 :(得分:0)
首先,类名应以大写字母开头。
GraphArea
的大小(注意正确的名称)是(0,0),所以没有什么可以画的。
您需要覆盖getPreferredSize()
方法以返回面板的大小。然后布局管理器可以正常工作。