写一个展示系统，要求以命令行的形式或图形的方式或界面的方式展示所有Java实验做的题目和运行结果。 改展示系统主要有下面的功能： 1、增加java实验的题目 2、修改题目 3、删除题目 4、为每个实验添加完成的程序 5、为每个实验添加完成的程序的运行结果 6、删除已提交的程序，删除已提交的结果 7、展示系统退出后提交的程序和结果保存在文件或数据库中。

这是一个相对复杂的系统，需要根据不同的需求和技术栈来实现。以下是一个简单的展示系统的示例代码，仅供参考。

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class JavaLabSystem {
    private ArrayList<String> labTitles;
    private Map<String, String> labPrograms;
    private Map<String, String> labResults;

    public JavaLabSystem() {
        this.labTitles = new ArrayList<>();
        this.labPrograms = new HashMap<>();
        this.labResults = new HashMap<>();
    }

    public void addLab(String title, String program, String result) {
        labTitles.add(title);
        labPrograms.put(title, program);
        labResults.put(title, result);
    }

    public void updateLab(String title, String program, String result) {
        labPrograms.replace(title, program);
        labResults.replace(title, result);
    }

    public void deleteLab(String title) {
        labTitles.remove(title);
        labPrograms.remove(title);
        labResults.remove(title);
    }

    public void displayLabs() {
        for (int i = 0; i < labTitles.size(); i++) {
            System.out.println("[" + (i + 1) + "] " + labTitles.get(i));
        }
    }

    public void displayLabDetails(String title) {
        System.out.println("Title: " + title);
        System.out.println("Program: " + labPrograms.get(title));
        System.out.println("Result: " + labResults.get(title));
    }

    public void runLabProgram(String title) {
        System.out.println("Running program for " + title + "...");
        // TODO: 执行程序的代码
    }

    public void deleteLabProgram(String title) {
        labPrograms.replace(title, "");
        labResults.replace(title, "");
        System.out.println("Program and result for " + title + " have been deleted.");
    }

    public void saveToFile() {
        // TODO: 将数据保存到文件的代码
    }

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        JavaLabSystem labSystem = new JavaLabSystem();
        boolean isRunning = true;

        while (isRunning) {
            System.out.println("Java Lab System");
            System.out.println("1. Add lab");
            System.out.println("2. Update lab");
            System.out.println("3. Delete lab");
            System.out.println("4. Display labs");
            System.out.println("5. Display lab details");
            System.out.println("6. Run lab program");
            System.out.println("7. Delete lab program");
            System.out.println("8. Save to file");
            System.out.println("9. Exit");
            System.out.print("Enter your choice: ");
            int choice = input.nextInt();
            input.nextLine(); // 消耗掉回车符

            switch (choice) {
                case 1:
                    System.out.print("Enter lab title: ");
                    String title = input.nextLine();
                    System.out.print("Enter lab program: ");
                    String program = input.nextLine();
                    System.out.print("Enter lab result: ");
                    String result = input.nextLine();
                    labSystem.addLab(title, program, result);
                    System.out.println("Lab added successfully.");
                    break;
                case 2:
                    System.out.print("Enter lab title to update: ");
                    String labTitle = input.nextLine();
                    if (labSystem.labTitles.contains(labTitle)) {
                        System.out.print("Enter new lab program: ");
                        String labProgram = input.nextLine();
                        System.out.print("Enter new lab result: ");
                        String labResult = input.nextLine();
                        labSystem.updateLab(labTitle, labProgram, labResult);
                        System.out.println("Lab updated successfully.");
                    } else {
                        System.out.println("Lab not found.");
                    }
                    break;
                case 3:
                    System.out.print("Enter lab title to delete: ");
                    String labTitleToDelete = input.nextLine();
                    if (labSystem.labTitles.contains(labTitleToDelete)) {
                        labSystem.deleteLab(labTitleToDelete);
                        System.out.println("Lab deleted successfully.");
                    } else {
                        System.out.println("Lab not found.");
                    }
                    break;
                case 4:
                    labSystem.displayLabs();
                    break;
                case 5:
                    System.out.print("Enter lab title to display details: ");
                    String labTitleToDisplay = input.nextLine();
                    if (labSystem.labTitles.contains(labTitleToDisplay)) {
                        labSystem.displayLabDetails(labTitleToDisplay);
                    } else {
                        System.out.println("Lab not found.");
                    }
                    break;
                case 6:
                    System.out.print("Enter lab title to run program: ");
                    String labTitleToRun = input.nextLine();
                    if (labSystem.labTitles.contains(labTitleToRun)) {
                        labSystem.runLabProgram(labTitleToRun);
                    } else {
                        System.out.println("Lab not found.");
                    }
                    break;
                case 7:
                    System.out.print("Enter lab title to delete program: ");
                    String labTitleToDeleteProgram = input.nextLine();
                    if (labSystem.labTitles.contains(labTitleToDeleteProgram)) {
                        labSystem.deleteLabProgram(labTitleToDeleteProgram);
                    } else {
                        System.out.println("Lab not found.");
                    }
                    break;
                case 8:
                    labSystem.saveToFile();
                    System.out.println("Data saved to file.");
                    break;
                case 9:
                    isRunning = false;
                    System.out.println("Exiting Java Lab System...");
                    break;
                default:
                    System.out.println("Invalid choice. Please try again.");
                    break;
            }
            System.out.println();
        }
    }
}

这个示例代码使用了面向对象的编程思想，将Java实验系统封装成了一个Java类，提供了增加、修改、删除、展示和运行实验等功能。这个示例代码仅供参考，实际开发中需要根据具体的需求进行修改和完善。