持久化类的要求

package test1;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="teacher_info")
public class Teachers {
    //设置标识属性
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer tId;
    private String name;
    private Integer age;
    //提供无参构造方法
    public Teachers(){
        
    }
    //提供setter、getter方法
    public void setTId(Integer tId){
        this.tId = tId;
    }
    public Integer getTId(){
        return this.tId;
    }
    public void setName(String name){
        this.name = name;
    }
    public String getName(){
        return this.name;
    }
    public void setAge(Integer age){
        this.age = age;
    }
    public Integer getAge(){
        return this.age;
    }
    //重写equals方法
    public boolean equals(Object obj){
        if(obj==null){
            return false;
        }else if(this==obj){
            return true;
        }else if(obj instanceof Teachers){
            Teachers tea = (Teachers) obj;
            return tea.getTId().equals(this.getTId());
        }else{
            return false;
        }
    }
    //重写hashCode方法
    public int hashCode(){
        return this.getTId();
    }
}