Clas.java文件如下：

package com.school.entity;public class Clas {        // 課程id    private int id;    // 課程名稱    private String name;    // 課程介紹    private String comment;        // 默認構造方法    public Clas() {    }        // 包含全部屬性的構造方法    public Clas(int id, String name, String comment) {        super();        this.id = id;        this.name = name;        this.comment = comment;    }        public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getComment() {        return comment;    }    public void setComment(String comment) {        this.comment = comment;    }}