为什么 BorderLayout 无法正确显示多层？

Question

我正在为 21 点帮助程序设置 UI，虽然我知道这不是最漂亮的做事方式，但它很有意义。
似乎是上层的分层工作不正常。有什么建议么？
左边应该有四层，中间和右边应该有两层，介于键盘和输入按钮之间。图片附在下面。

import java.util.*;
import java.lang.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;

// main method, runs the program
class BlackjackHelper
{
    public static void main(String\[\] args)
    {
        Frame21 game = new Frame21();
        //pop window with rules of game
    }
}

// JFrame Construction
class Frame21 extends JFrame
{
    // create needed components of program
    JLabel questionDisplay = new JLabel("What is your first card?");
    JLabel actionDisplay = new JLabel("Enter your first card");
    JLabel dealerCardText = new JLabel("Dealer's Card:");
    JLabel dealerCardDisplay = new JLabel("N/A");
    JLabel handOneText = new JLabel("Hand One:");
    JLabel handOneDisplay = new JLabel("N/A");
    JLabel handTwoText = new JLabel("Hand Two:");
    JLabel handTwoDisplay = new JLabel("N/A");
    JLabel statsText = new JLabel("Win %:");
    JLabel statsDisplay = new JLabel("N/A");
    JButton aceButton = new JButton("A");
    JButton twoButton = new JButton("2");
    JButton threeButton = new JButton("3");
    JButton fourButton = new JButton("4");
    JButton fiveButton = new JButton("5");
    JButton sixButton = new JButton("6");
    JButton sevenButton = new JButton("7");
    JButton eightButton = new JButton("8");
    JButton nineButton = new JButton("9");
    JButton tenButton = new JButton("10");
    JButton faceButton = new JButton("F");
    JButton clearButton = new JButton("C");
    JButton standButton = new JButton("Stand");
    JButton hitButton = new JButton("Hit");
    JButton doubleButton = new JButton("Double");
    JButton splitButton = new JButton("Split");
    JButton winButton = new JButton("Win");
    JButton loseButton = new JButton("Lose");
    JButton resetButton = new JButton("Reset All");
    JButton enterButton = new JButton("Enter");

    public Frame21()
    {
        // JFrame - the main area of the program
        JFrame frame = new JFrame("Blackjack Helper");

        // JPanel right - the rightside of the program
        JPanel rightSide = new JPanel();

        JPanel rightNorthSide = new JPanel();
        rightNorthSide.setLayout(new GridLayout(3,4));
        rightNorthSide.add(aceButton);
        rightNorthSide.add(twoButton);
        rightNorthSide.add(threeButton);
        rightNorthSide.add(fourButton);
        rightNorthSide.add(fiveButton);
        rightNorthSide.add(sixButton);
        rightNorthSide.add(sevenButton);
        rightNorthSide.add(eightButton);
        rightNorthSide.add(nineButton);
        rightNorthSide.add(tenButton);
        rightNorthSide.add(faceButton);
        rightNorthSide.add(clearButton);

        JPanel rightSouthSide = new JPanel();
        rightSouthSide.add(resetButton, BorderLayout.WEST);
        rightSouthSide.add(enterButton, BorderLayout.EAST);

        rightSide.add(rightNorthSide, BorderLayout.NORTH);
        rightSide.add(rightSouthSide, BorderLayout.SOUTH);

        frame.add(rightSide, BorderLayout.EAST);

        // JPanel Center - the center of the program
        JPanel center = new JPanel();

        JPanel centerNorth = new JPanel();
        centerNorth.add(questionDisplay, BorderLayout.NORTH);
        centerNorth.add(actionDisplay, BorderLayout.SOUTH);

        JPanel centerSouth = new JPanel();

        JPanel centerSouthNorth = new JPanel();
        centerSouthNorth.add(dealerCardText, BorderLayout.WEST);
        centerSouthNorth.add(dealerCardDisplay, BorderLayout.EAST);

        JPanel centerSouthSouth = new JPanel();

        JPanel centerSouthSouthWest = new JPanel();
        centerSouthSouthWest.add(handOneText, BorderLayout.NORTH);
        centerSouthSouthWest.add(handOneDisplay, BorderLayout.SOUTH);

        JPanel centerSouthSouthEast = new JPanel();
        centerSouthSouthEast.add(handTwoText, BorderLayout.NORTH);
        centerSouthSouthEast.add(handTwoDisplay, BorderLayout.SOUTH);

        centerSouthSouth.add(centerSouthSouthWest, BorderLayout.WEST);
        centerSouthSouth.add(centerSouthSouthEast, BorderLayout.EAST);

        centerSouth.add(centerSouthNorth, BorderLayout.NORTH);
        centerSouth.add(centerSouthSouth, BorderLayout.SOUTH);

        center.add(centerNorth, BorderLayout.NORTH);
        center.add(centerSouth, BorderLayout.SOUTH);

        frame.add(center, BorderLayout.CENTER);

        // JPanel left - the center of the program
        JPanel left = new JPanel();

        JPanel leftNorth = new JPanel();
        JPanel leftNorthNorth = new JPanel();
        JPanel leftNorthSouth = new JPanel();
        JPanel leftSouth = new JPanel();
        JPanel leftSouthNorth = new JPanel();
        JPanel leftSouthSouth = new JPanel();

        leftNorthNorth.add(standButton, BorderLayout.WEST);
        leftNorthNorth.add(hitButton, BorderLayout.EAST);
        leftNorthSouth.add(doubleButton, BorderLayout.WEST);
        leftNorthSouth.add(splitButton, BorderLayout.EAST);
        leftNorth.add(leftNorthNorth, BorderLayout.NORTH);
        leftNorth.add(leftNorthSouth, BorderLayout.SOUTH);

        leftSouthNorth.add(statsText, BorderLayout.WEST);
        leftSouthNorth.add(statsDisplay, BorderLayout.EAST);
        leftSouthSouth.add(winButton, BorderLayout.WEST);
        leftSouthSouth.add(loseButton, BorderLayout.EAST);
        leftSouth.add(leftSouthNorth, BorderLayout.NORTH);
        leftSouth.add(leftSouthSouth, BorderLayout.SOUTH);

        left.add(leftNorth, BorderLayout.NORTH);
        left.add(leftSouth, BorderLayout.SOUTH);

        frame.add(left, BorderLayout.WEST);

        frame.setSize(1600, 200);
        frame.setVisible(true);
        frame.setResizable(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

Answer 1

The layering for what seems to be the upper layers is not working properly. Any suggestions? The left should have four layers.

BorderLayout 没有 "layer"。

BorderLayout 的 5 个区域中的每个区域只能添加一个组件。

所以，是的，您可以创建一个 JPanel 并将多个组件添加到该面板，然后将该面板添加到 BorderLayout 的一个区域。

    JPanel rightSouthSide = new JPanel();
    rightSouthSide.add(resetButton, BorderLayout.WEST);
    rightSouthSide.add(enterButton, BorderLayout.EAST);

但是，上面的代码是不正确的。 JPanel 的默认布局管理器是 FlowLayout。所以指定 BorderLayout 约束没有任何作用（而且非常混乱）。

如果 "layers" 是指 "rows"，那么您需要使用具有不同布局管理的面板。也许您可以使用 BoxLayout 添加面板行。

总体而言，您使用不同组件创建面板的方法是有效的，问题是您还需要为每个子面板使用适当的布局管理器。

阅读 Layout Managers 上的 Swing 教程，了解有关每个布局管理器如何工作的更多信息。

为什么 BorderLayout 无法正确显示多层？

Why is BorderLayout not displaying properly with multiple layers?

java

layout

swing

layout-manager

border-layout