Java源代码，开发一个简易信息管理软件，要求需求定义清晰，源代码符合规范，设计良好的图形用户界面，方便用户的操作。示例，班级成绩管理系统，管理一个班30人的思政、高数、英语、体育四科的成绩，主要功能有：学生信息管理，各门课成绩管理，成绩统计与排序等。

好的，这是一个比较复杂的项目，需要一定的开发经验和技能。以下是一个简单的班级成绩管理系统的Java源代码示例，供参考：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ScoreManagementSystem extends JFrame {
    private static final long serialVersionUID = 1L;
    private JLabel lbTitle, lbName, lbGender, lbAge, lbMajor, lbScore;
    private JTextField tfName, tfAge, tfMajor, tfScore;
    private JRadioButton rbMale, rbFemale;
    private ButtonGroup bgGender;
    private JButton btnAdd, btnDelete, btnModify, btnClear, btnSearch, btnSort;
    private JTextArea taOutput;
    private JScrollPane spOutput;
    private StudentList studentList;

    public ScoreManagementSystem() {
        super("班级成绩管理系统");

        lbTitle = new JLabel("学生信息管理");
        lbTitle.setFont(new Font("宋体", Font.BOLD, 20));
        lbName = new JLabel("姓名：");
        lbGender = new JLabel("性别：");
        lbAge = new JLabel("年龄：");
        lbMajor = new JLabel("专业：");
        lbScore = new JLabel("成绩：");

        tfName = new JTextField(10);
        tfAge = new JTextField(10);
        tfMajor = new JTextField(10);
        tfScore = new JTextField(10);

        rbMale = new JRadioButton("男", true);
        rbFemale = new JRadioButton("女", false);
        bgGender = new ButtonGroup();
        bgGender.add(rbMale);
        bgGender.add(rbFemale);

        btnAdd = new JButton("添加");
        btnDelete = new JButton("删除");
        btnModify = new JButton("修改");
        btnClear = new JButton("清空");
        btnSearch = new JButton("搜索");
        btnSort = new JButton("排序");

        taOutput = new JTextArea(10, 30);
        taOutput.setEditable(false);
        spOutput = new JScrollPane(taOutput);

        studentList = new StudentList();

        JPanel pInput = new JPanel(new GridLayout(6, 2));
        pInput.add(lbName);
        pInput.add(tfName);
        pInput.add(lbGender);
        pInput.add(rbMale);
        pInput.add(new JLabel(""));
        pInput.add(rbFemale);
        pInput.add(lbAge);
        pInput.add(tfAge);
        pInput.add(lbMajor);
        pInput.add(tfMajor);
        pInput.add(lbScore);
        pInput.add(tfScore);

        JPanel pButton = new JPanel(new GridLayout(2, 3));
        pButton.add(btnAdd);
        pButton.add(btnDelete);
        pButton.add(btnModify);
        pButton.add(btnClear);
        pButton.add(btnSearch);
        pButton.add(btnSort);

        JPanel pOutput = new JPanel();
        pOutput.add(spOutput);

        Container container = getContentPane();
        container.setLayout(new BorderLayout());
        container.add(lbTitle, BorderLayout.NORTH);
        container.add(pInput, BorderLayout.CENTER);
        container.add(pButton, BorderLayout.SOUTH);
        container.add(pOutput, BorderLayout.EAST);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(500, 400);
        setLocationRelativeTo(null);
        setVisible(true);

        btnAdd.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String name = tfName.getText();
                String gender = rbMale.isSelected() ? "男" : "女";
                int age = Integer.parseInt(tfAge.getText());
                String major = tfMajor.getText();
                double score = Double.parseDouble(tfScore.getText());
                Student student = new Student(name, gender, age, major, score);
                if (studentList.add(student)) {
                    taOutput.setText("添加成功！\n" + studentList.toString());
                    clearInput();
                } else {
                    taOutput.setText("添加失败！\n");
                }
            }
        });

        btnDelete.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String name = tfName.getText();
                if (studentList.delete(name)) {
                    taOutput.setText("删除成功！\n" + studentList.toString());
                    clearInput();
                } else {
                    taOutput.setText("删除失败！\n");
                }
            }
        });

        btnModify.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String name = tfName.getText();
                String gender = rbMale.isSelected() ? "男" : "女";
                int age = Integer.parseInt(tfAge.getText());
                String major = tfMajor.getText();
                double score = Double.parseDouble(tfScore.getText());
                Student student = new Student(name, gender, age, major, score);
                if (studentList.modify(name, student)) {
                    taOutput.setText("修改成功！\n" + studentList.toString());
                    clearInput();
                } else {
                    taOutput.setText("修改失败！\n");
                }
            }
        });

        btnClear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                clearInput();
            }
        });

        btnSearch.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String name = tfName.getText();
                Student student = studentList.search(name);
                if (student != null) {
                    taOutput.setText("查询成功！\n" + student.toString());
                    clearInput();
                } else {
                    taOutput.setText("查询失败！\n");
                }
            }
        });

        btnSort.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                studentList.sort();
                taOutput.setText("排序成功！\n" + studentList.toString());
                clearInput();
            }
        });
    }

    private void clearInput() {
        tfName.setText("");
        rbMale.setSelected(true);
        tfAge.setText("");
        tfMajor.setText("");
        tfScore.setText("");
    }

    public static void main(String[] args) {
        new ScoreManagementSystem();
    }
}

class Student {
    private String name;
    private String gender;
    private int age;
    private String major;
    private double score;

    public Student(String name, String gender, int age, String major, double score) {
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.major = major;
        this.score = score;
    }

    public String getName() {
        return name;
    }

    public String getGender() {
        return gender;
    }

    public int getAge() {
        return age;
    }

    public String getMajor() {
        return major;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    public String toString() {
        return "姓名：" + name + "，性别：" + gender + "，年龄：" + age + "，专业：" + major + "，成绩：" + score;
    }
}

class StudentList {
    private Student[] students;
    private int size;

    public StudentList() {
        students = new Student[30];
        size = 0;
    }

    public boolean add(Student student) {
        if (size >= 30) {
            return false;
        }
        students[size++] = student;
        return true;
    }

    public boolean delete(String name) {
        for (int i = 0; i < size; i++) {
            if (students[i].getName().equals(name)) {
                for (int j = i; j < size - 1; j++) {
                    students[j] = students[j + 1];
                }
                students[--size] = null;
                return true;
            }
        }
        return false;
    }

    public boolean modify(String name, Student student) {
        for (int i = 0; i < size; i++) {
            if (students[i].getName().equals(name)) {
                students[i] = student;
                return true;
            }
        }
        return false;
    }

    public Student search(String name) {
        for (int i = 0; i < size; i++) {
            if (students[i].getName().equals(name)) {
                return students[i];
            }
        }
        return null;
    }

    public void sort() {
        for (int i = 0; i < size - 1; i++) {
            for (int j = i + 1; j < size; j++) {
                if (students[i].getScore() < students[j].getScore()) {
                    Student temp = students[i];
                    students[i] = students[j];
                    students[j] = temp;
                }
            }
        }
    }

    public String toString() {
        String str = "";
        for (int i = 0; i < size; i++) {
            str += students[i].toString() + "\n";
        }
        return str;
    }
}

以上代码实现了一个简单的班级成绩管理系统，包含了学生信息的添加、删除、修改、搜索、排序等功能。用户可以通过图形用户界面方便地操作系统。注意，这只是一个示例代码，仅供参考，具体实现还需要根据需求进行调整和修改。