使用java编写2个代码。1、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，定义两个成员方法，一个是求总分，另一个是求平均分。2、定义一个测试类StudentTest，创建一个Student对象，对其进行赋值并计算总分与平均分。

1. 学生类Student的代码：

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

    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;
    }

    public double getTotalScore() {
        return chineseScore + mathScore + englishScore;
    }

    public double getAverageScore() {
        return getTotalScore() / 3;
    }
}

2. 测试类StudentTest的代码：

public class StudentTest {
    public static void main(String[] args) {
        Student student = new Student("张三", "男", 18, 80, 90, 85);

        double totalScore = student.getTotalScore();
        double averageScore = student.getAverageScore();

        System.out.println("学生 " + student.getName() + " 的总分是：" + totalScore);
        System.out.println("学生 " + student.getName() + " 的平均分是：" + averageScore);
    }
}