当我从主框架开始使用getHeight（）和getWidth（）时，紧接在frame.pack（）之后，我得到了真实的高度/宽度值。但是，当我在其他班级中使用它们时，它不起作用。
我已经尝试过以不同的方式组织我的主编（因为许多人在其他类似的问题中提出了建议），结果变得有些混乱，并且没有任何变化。
public static void main(String[] args) {
JFrame frame = new JFrame("Rubik's Cube Solver");
frame.setVisible(true);
frame.setSize(1200,1200);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
BorderLayout layout = new BorderLayout();
frame.setLayout(layout);
Rubiks_Cube cube = new Rubiks_Cube();
JPanel top = new JPanel();
JButton scramble = new JButton("Scramble");
JToggleButton solver = new JToggleButton("Solve");
scramble.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
cube.scramble();
}
});
solver.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
cube.solver();
}
});
top.add(scramble);
top.add(solver);
frame.add(top, layout.PAGE_START);
JPanel bottom = new JPanel();
bottom.setBackground(Color.BLACK);
JPanel green = new JPanel();
JPanel red = new JPanel();
JPanel blue = new JPanel();
JPanel orange = new JPanel();
JPanel white = new JPanel();
JPanel yellow = new JPanel();
bottom.setVisible(true);
green.setVisible(true);
red.setVisible(true);
blue.setVisible(true);
orange.setVisible(true);
white.setVisible(true);
yellow.setVisible(true);
bottom.add(green);
bottom.add(red);
bottom.add(blue);
bottom.add(orange);
bottom.add(white);
bottom.add(yellow);
green.setPreferredSize(new Dimension(150,150));
red.setPreferredSize(new Dimension(150,150));
blue.setPreferredSize(new Dimension(150,150));
orange.setPreferredSize(new Dimension(150,150));
white.setPreferredSize(new Dimension(150,150));
yellow.setPreferredSize(new Dimension(150,150));
green.setMinimumSize(new Dimension(100,100));
red.setMinimumSize(new Dimension(100,100));
blue.setMinimumSize(new Dimension(100,100));
orange.setMinimumSize(new Dimension(100,100));
white.setMinimumSize(new Dimension(100,100));
yellow.setMinimumSize(new Dimension(100,100));
green.setMaximumSize(new Dimension(200,200));
red.setMaximumSize(new Dimension(200,200));
blue.setMaximumSize(new Dimension(200,200));
orange.setMaximumSize(new Dimension(200,200));
white.setMaximumSize(new Dimension(200,200));
yellow.setMaximumSize(new Dimension(200,200));
frame.add(bottom);
frame.pack();
green.add(new paintCube("green", cube));
red.add(new paintCube("red", cube));
blue.add(new paintCube("blue", cube));
orange.add(new paintCube("orange", cube));
white.add(new paintCube("white", cube));
yellow.add(new paintCube("yellow", cube));
System.out.print(green.getHeight); //<===== returns the real height
}}
这是我的另一堂课。
public class paintCube extends Rubiks_Cube {
private String facecolor = null;
private Rubiks_Cube cube = new Rubiks_Cube();
public paintCube(String color, Rubiks_Cube cube) {
facecolor = color;
cubelayout = cube.getCubeLayout();
}
@Override
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
int a = 0;
switch (facecolor) {
case "green": a = 0; break;
case "blue": a = 2; break;
case "white": a = 4; break;
case "orange": a = 3; break;
case "yellow": a = 5; break;
case "red": a = 1; break;
}
for (int i = 0; i <= 8; i++) {
int b = cubelayout[a][i]/10;
switch (b) {
case 0: g2.setColor(Color.GREEN); break;
case 1: g2.setColor(Color.RED); break;
case 2: g2.setColor(Color.BLUE); break;
case 3: g2.setColor(Color.ORANGE); break;
case 4: g2.setColor(Color.WHITE); break;
case 5: g2.setColor(Color.YELLOW); break;
}
int j = cubelayout[a][i]%10;
switch (j) {
case 0: g2.fillRect(0, 0, super.getWidth()/3, super.getHeight()/3); break;
case 1: g2.fillRect(super.getWidth()/3, 0, super.getWidth()/3, super.getHeight()/3); break;
case 2: g2.fillRect((super.getWidth()/3)*2, 0, super.getWidth()/3, super.getHeight()/3); break;
case 3: g2.fillRect(0, super.getHeight()/3, super.getWidth()/3, super.getHeight()/3); break;
case 4: g2.fillRect(super.getWidth()/3, super.getHeight()/3, super.getWidth()/3, super.getHeight()/3); break;
case 5: g2.fillRect((super.getWidth()/3)*2, super.getHeight()/3, super.getWidth()/3, super.getHeight()/3); break;
case 6: g2.fillRect(0, (super.getHeight()/3)*2, super.getWidth()/3, super.getHeight()/3); break;
case 7: g2.fillRect(super.getWidth()/3, (super.getHeight()/3)*2, super.getWidth()/3, super.getHeight()/3); break;
case 8: g2.fillRect((super.getWidth()/3)*2, (super.getHeight()/3)*2, super.getWidth()/3, super.getHeight()/3); break;
}
}
g2.setStroke(new BasicStroke(4));
g2.setColor(Color.BLACK);
for (int i = 1; i <= 2; i++) {
g2.drawLine((super.getWidth()/3)*i, super.getHeight(), (super.getWidth()/3)*i, 0);
g2.drawLine(super.getWidth(), (super.getHeight()/3)*i, 0, (super.getHeight()/3)*i);
}
System.out.println(super.getHeight()); //<==== returns 1 everytime
}}
我是新手，因此，如果发现任何其他错误，请更正。
最佳答案
在main（）中，您将获得绿色的宽度/高度，绿色是您指定大小的JPanel。
在paintCube中，您将获得已添加到绿色的paintCube的宽度/高度。它由JPanel的默认布局管理器（即FlowLayout）进行布局，因为您没有指定布局管理器。您没有为该组件指定大小，因此其大小为零。
将绿色等的布局管理器更改为BorderLayout，并使用BorderLayout.CENTER向其添加paintCube，这样它将扩展为父级的大小（绿色）。
顺便说一句，您应该遵循Java约定并将类命名为PaintCube，而不是paintCube。