Swing 实现的Gui链表

https://gitee.com/dgwcode/MyJavaCode

-Freight类可以实现的功能
·构造方法：初始空车厢有5个
·装货：当运往某地点的货物大于等于4个的时候，如果有空车箱，则先占用整个空车厢，如果没有空车厢，则在尾部新增一个车厢节点，存放货物（假设不存在超过7个的情况），并且从链表头部依次搜索是否有车厢还有空位，如果有，将多出来的零散货物分别装进车厢（如上图的5件B，先装满第二个车厢，然后搜索后再将剩余的一件装入第一车厢）
·卸货：当到达某地时，以B为例，搜索链表，如果某个车厢都是该地货物，则从链表中删除此节点，并将其他零散B地货物从车厢中去除。

java Swing 实现的链表类

package M;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTextArea;

class Carriage { /// 车厢
    int size = 0;// 表示当前车厢已经装了几个活物
    char a[] = new char[4];/// a用来装货物
    Carriage next;/// 连接下一个
}
public class A {

    private static int FLAG = -1;
    private final static int WIDTH = 800;
    private final static int HEIGHT = 400;
    private static Container container;
    private static JPanel UpPanel;
    private static JPanel bottomPanel;
    private static JButton Input0;
    private static JButton Input1;
    private static JButton Input2;
    private static JTextArea viewArea;
    private static JScrollPane jspane1;
    private static JSplitPane jsp;
    static int size = 5;/// 最初的5个车厢
    static Carriage Head = new Carriage();/// 最开始的都头结点

    public static void init() {
        // TODO Auto-generated constructor stub
        Carriage p = Head;
        for (int i = 0; i < 5; i++) {
            Carriage r = new Carriage();
            p.next = r;//// 连接
            p = r;
        }
    }

    public static void main(String[] args) {
        init();
        InitFrame();

    }

    public static void Logic(int a, char car, int num) {
        if (a == 0) {
            //System.out.println("准备打印链表状态");
            viewArea.append("准备打印链表状态
");
            for (int i = 0; i < size; i++) {
                PrintCarUp();
                //System.out.print("    ");
                viewArea.append("    ");
            }
            //System.out.println();
            viewArea.append("
");
            Carriage p = Head.next;
            while (p != null) {
                //System.out.print("*");
                viewArea.append("*");
                for (int i = 0; i < 4; i++) {
                    if (p.a[i] == 0)
                        //System.out.print(" ");
                        viewArea.append(" ");
                    else
                        //System.out.print(p.a[i]);
                        viewArea.append(String.valueOf(p.a[i]));
                }
                //System.out.print("*");
                viewArea.append("*");
                showNext();
                p = p.next;
            }
            //System.out.println();
            viewArea.append("
");
            for (int i = 0; i < size; i++) {
                PrintCarUp();
                //System.out.print("    ");
                viewArea.append("    ");
            }
            //System.out.println();
            viewArea.append("
");
        } else if (a == 1) {
            //System.out.println("请输入两个数，第一个为字母，第二个数字，例如 A 2");
            viewArea.append("请输入两个数，第一个为字母，第二个数字，例如 A 2");
            while (num != 0) {
                Carriage p = Head;
                while (p.next != null) {
                    if (p.next.size == 4)
                        p = p.next;
                    for (int i = 0; i < 4; i++) {
                        if (p.next.a[i] == 0) {
                            p.next.a[i] = car;
                            p.next.size++;
                            num--;
                        }
                        if (num == 0)
                            break;
                    }
                    if (num == 0)
                        break;
                    p = p.next;
                }
                while (num != 0) {
                    Carriage r = new Carriage();
                    p.next = r;
                    p = r;
                    for (int i = 0; i < 4 && num != 0; i++) {
                        r.a[i] = car;
                        num--;
                    }
                }
            }
        } else {
            //System.out.println("请输入一个字母，例如 A");
            viewArea.append("请输入一个字母，例如 A");
            Carriage p = Head;
            int num1 = 0;
            while (p.next != null) {
                for (int i = 0; i < 4; i++) {
                    if (p.next.a[i] == car) {
                        p.next.a[i] = 0;
                        num1++;
                    }
                }
                if (num1 == 4) {
                    Carriage r = p.next;
                    p.next = r.next;
                    r.next = null;/// 回收利用
                    size--;
                } else {
                    p = p.next;
                }
                num1 = 0;
            }
        }
    }

    private static void InitFrame() {
        JFrame Main = new JFrame("Carriage");
        container = Main.getContentPane();
        container.setLayout(new BorderLayout());
        Main.setSize(WIDTH, HEIGHT);
        Main.setLocationRelativeTo(null);
        Main.setLayout(new BorderLayout());
        Main.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Input0 = new JButton("打印链表状态0");
        Input1 = new JButton("装货1");
        Input2 = new JButton("卸货2");
        UpPanel = new JPanel(new FlowLayout());
        bottomPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        viewArea = new JTextArea("选择按钮 0,1,2，输入-1退出");
        viewArea.setLineWrap(true);
        viewArea.setFont(new Font("黑体", Font.BOLD, 15));
        jspane1 = new JScrollPane(viewArea) {
            private static final long serialVersionUID = 1L;

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(780, 280);
            }

            @Override
            public Font getFont() {
                return new Font("黑体", Font.BOLD, 12);
            }
        };

        UpPanel.setSize(WIDTH, 150);
        bottomPanel.setSize(WIDTH, 250);

        UpPanel.add(Input0);
        UpPanel.add(Input1);
        UpPanel.add(Input2);

        bottomPanel.add(jspane1);

        jsp = new JSplitPane(JSplitPane.VERTICAL_SPLIT, UpPanel, bottomPanel);
        jsp.setDividerLocation(70); // 设置拆分窗格分频器初始位置
        jsp.setDividerSize(1); // 设置分频器大小
        container.add(jsp);
        // button lisenner
        Input0.addActionListener(e -> {
            FLAG=0;
            Logic(FLAG, '0', 0);
        });
        Input1.addActionListener(e -> {
            String inputValue = JOptionPane.showInputDialog("请输入两个数，第一个为字母，第二个数字，例如 A 2(注意空格)");
            // System.out.println("请输入两个数，第一个为字母，第二个数字，例如 A 2");
            if (inputValue.equals(" ") || inputValue == null) {

            } else {
                char car = inputValue.charAt(0);
                int num = inputValue.charAt(2) - '0';
                FLAG=1;
                Logic(FLAG, car, num);
                // System.out.println(car+" "+num);
            }
        });
        Input2.addActionListener(e -> {
            String inputValue = JOptionPane.showInputDialog("请输入一个字母，例如 A");
            if (inputValue.equals(" ") || inputValue == null) {

            } else {
                char car = inputValue.charAt(0);
                FLAG=2;
                Logic(FLAG, car, 0);
                // System.out.println(car+" "+num);
            }

        });

        Main.setVisible(true);
    }

    private static void PrintCarUp() {
        //System.out.print("******");
        viewArea.append("******");
    }

    private static void PrintCarleft() {
        //System.out.print("*");
        viewArea.append("*");
    }

    private static void PrintCarright() {
        //System.out.print("*");
        viewArea.append("*");
    }

    private static void PrintCardown() {
        //System.out.print("******");
        viewArea.append("******");
    }

    private static void showNext() {
        //System.out.print("--->");
        viewArea.append("--->");
    }

    private static void print() {
        //System.out.println("请输入0 1 2 或者-1退出");
        viewArea.append("请输入0 1 2 或者-1退出");
        show();
    }
    public static void show() {
        //System.out.println("0-打印链表状态");
        //System.out.println("1-装货");
        //System.out.println("2-卸货");
        viewArea.append("0-打印链表状态");
        viewArea.append("1-装货");
        viewArea.append("2-卸货");
    }
}