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。

在Java中，你可以这样定义一个名为"Student"的基本类：

public class Student {
    // 成员变量
    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;
    }

    // get方法获取成员变量
    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;
    }

    // set方法设置成员变量
    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;
    }

    // 计算总分和平均分
    public double getTotalScore() {
        return chineseScore + mathScore + englishScore;
    }

    public double getAverageScore() {
        if (totalScore > 0) {
            return totalScore / 3.0;
        } else {
            throw new IllegalArgumentException("Total score cannot be zero.");
        }
    }
}