试编写一个教师类，教师有姓名、年龄、工资等属性，如果两个教师姓名、年龄和工资都相同，就认为是同一人，不能加入同一个集合，试用TreeSet类将若干教师信息保存并显示。JAVA代码实现加注释

好的，以下是实现教师类并使用TreeSet保存并显示的JAVA代码：

import java.util.TreeSet;

//自定义教师类
class Teacher implements Comparable<Teacher>{
    private String name;
    private int age;
    private double salary;

    public Teacher(String name, int age, double salary) {
        this.name = name;
        this.age = age;
        this.salary = salary;
    }

    //按照姓名、年龄、工资的顺序比较
    @Override
    public int compareTo(Teacher o) {
        int result = this.name.compareTo(o.name);
        if(result == 0){
            result = this.age - o.age;
            if(result == 0){
                result = (int)(this.salary - o.salary);
            }
        }
        return result;
    }

    //重写equals方法，判断两个教师是否相同
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Teacher other = (Teacher) obj;
        if (age != other.age)
            return false;
        if (Double.doubleToLongBits(salary) != Double.doubleToLongBits(other.salary))
            return false;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }

    //重写hashCode方法
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + age;
        long temp;
        temp = Double.doubleToLongBits(salary);
        result = prime * result + (int) (temp ^ (temp >>> 32));
        result = prime * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }

    //重写toString方法，方便输出
    @Override
    public String toString() {
        return "Teacher [name=" + name + ", age=" + age + ", salary=" + salary + "]";
    }

}

public class TeacherTest {

    public static void main(String[] args) {
        //创建一个TreeSet对象
        TreeSet<Teacher> teachers = new TreeSet<>();
        //添加教师信息
        teachers.add(new Teacher("Tom", 35, 8000));
        teachers.add(new Teacher("Jerry", 28, 6000));
        teachers.add(new Teacher("Tom", 35, 8000)); //添加重复的教师信息
        teachers.add(new Teacher("Kevin", 42, 12000));
        //输出所有教师信息
        for(Teacher t : teachers){
            System.out.println(t);
        }
    }

}

在程序中，实现了教师类Teacher，其中包含了姓名、年龄、工资等属性。为了保证集合中不会出现重复的教师信息，重写了equals方法和hashCode方法，判断两个教师是否相同。使用TreeSet进行存储教师信息，并按照姓名、年龄、工资的顺序比较并排序，最终输出所有教师信息。