定义一个学生类 Student，成员变量包括姓名、性别、年龄、语文成绩、数学成 绩和英语成绩，成员方法包括 getXXX 方法、setXXX 方法、求总分和求平均分。 定义一个测试类 StudentT

好的，下面是一个简单的 Java 类设计，用于定义 `Student` 和 `StudentTest`：

// 定义 Student 类
public class Student {
    private String name;
    private String gender;
    private int age;
    private double chineseScore;
    private double mathScore;
    private double englishScore;

    // 构造函数
    public Student(String name, String gender, int age, double chineseScore, double mathScore, double englishScore) {
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.chineseScore = chineseScore;
        this.mathScore = mathScore;
        this.englishScore = englishScore;
    }

    // 获取方法（getters）
    public String getName() { return name; }
    public String getGender() { return gender; }
    public int getAge() { return age; }
    public double getChineseScore() { return chineseScore; }
    public double getMathScore() { return mathScore; }
    public double getEnglishScore() { return englishScore; }

    // 设置方法（setters）
    public void setName(String name) { this.name = name; }
    public void setGender(String gender) { this.gender = gender; }
    public void setAge(int age) { this.age = age; }
    public void setChineseScore(double chineseScore) { this.chineseScore = chineseScore; }
    public void setMathScore(double mathScore) { this.mathScore = mathScore; }
    public void setEnglishScore(double englishScore) { this.englishScore = englishScore; }

    // 求总分和平均分方法
    public double getTotalScore() {
        return chineseScore + mathScore + englishScore;
    }

    public double getAverageScore() {
        return getTotalScore() / 3.0;
    }
}

// 测试类 StudentTest
public class StudentTest {
    public static void main(String[] args) {
        // 创建一个学生实例并设置成绩
        Student student = new Student("张三", "男", 18, 95.0, 90.0, 85.0);

        // 调用方法展示信息
        System.out.println("Name: " + student.getName());
        System.out.println("Gender: " + student.getGender());
        System.out.println("Age: " + student.getAge());
        System.out.println("Total Score: " + student.getTotalScore());
        System.out.println("Average Score: " + student.getAverageScore());

        // 修改成绩并查看更新后的平均分
        student.setChineseScore(96.0);
        System.out.println("Updated Average Score after raising Chinese score: " + student.getAverageScore());
    }
}

在这个例子中，我们定义了一个包含个人信息和成绩属性的 `Student` 类，并为其提供了相应的getter和setter方法。同时，还实现了计算总分和平均分的功能。`StudentTest` 类则展示了如何创建 `Student` 的实例，并使用其提供的方法。