我试图逐步建立一个基于用户输入的图像。我想要做的是创建一堆图形并将它们添加为图层，但是我遇到了一些问题，因为它们不会显示出来。这里是我使用的代码：
I'm trying to gradually build up an image based on user inputs. What I'm trying to do is create a bunch of graphics and add them as layers however I'm having some issues as they won't show up. Here is the code I'm using:
public class ClassA { protected final static int dimesionsY = 1000; private static int dimesionsX; private static JFrame window; private static JLayeredPane layeredPane; public void init() { window = new JFrame("Foo"); dimesionsX = // some user input window.setPreferredSize(new Dimension(dimesionsX, dimesionsY)); window.setLayout(new BorderLayout()); layeredPane = new JLayeredPane(); layeredPane.setBounds(0, 0, dimesionsX, dimesionsY); window.add(layeredPane, BorderLayout.CENTER); ClassB myGraphic = new ClassB(); myGraphic.drawGraphic(); layeredPane.add(myGrpahic, new Integer(0), 0); window.pack(); window.setVisible(true); } } public class ClassB extends JPanel { public void drawGraphic() { repaint(); } public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.BLACK); g.fillRect(10, 10, 100, 100); } }然而，我的图形似乎并没有显示出来，我不明白为什么。我也尝试将它添加到 JPanel 中，并将 JPanel 添加到 JLayeredPane 然而，这也没有奏效。
However my graphic doesn't seem to show up and I don't understand why. I have also tried add it to a JPanel first, adding that JPanel to the JLayeredPane however that didn't work either.
请有人可以帮我解决问题吗？
Please can someone help me out?
推荐答案如果您将组件添加到JLayeredPane，就像使用容器将它添加到空布局一样：您必须完全指定组件的大小和位置。
If you add a component to a JLayeredPane, it's like adding it to a null layout using container: you must fully specify the component's size and position.
例如，
e.g.,
import java.awt.*; import javax.swing.*; public class ClassA { protected final static int dimesionsY = 800; protected final static int dimesionsX = 1000; //!! private static JFrame window; private static JLayeredPane layeredPane; public void init() { window = new JFrame("Foo"); // !! dimesionsX = // some user input //!! window.setPreferredSize(new Dimension(dimesionsX, dimesionsY)); window.setLayout(new BorderLayout()); layeredPane = new JLayeredPane(); //!! layeredPane.setBounds(0, 0, dimesionsX, dimesionsY); layeredPane.setPreferredSize(new Dimension(dimesionsX, dimesionsY)); window.add(layeredPane, BorderLayout.CENTER); ClassB myGraphic = new ClassB(); myGraphic.drawGraphic(); myGraphic.setSize(layeredPane.getPreferredSize()); myGraphic.setLocation(0, 0); //!! layeredPane.add(myGraphic, new Integer(0), 0); layeredPane.add(myGraphic, JLayeredPane.DEFAULT_LAYER); window.pack(); window.setVisible(true); } public static void main(String[] args) { new ClassA().init(); } } class ClassB extends JPanel { public void drawGraphic() { repaint(); } public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.BLACK); g.fillRect(10, 10, 100, 100); } }更多推荐
图形不显示在JLayeredPane（java swing）
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