问个问题，关于抽象类这么做有什么好处呢？新手求教
package po;// Generated by MyEclipse - Hibernate Tools/** * Toperator generated by MyEclipse - Hibernate Tools */public class Toperator extends AbstractToperator implements java.io.Serializable { // Constructors /** default constructor */ public Toperator() { } /** full constructor */ public Toperator(String operatorName, String operatorPwd, Long isAdmin) { super(isAdmin, operatorName, operatorPwd, isAdmin); } }public abstract class AbstractToperator implements java.io.Serializable { // Fields private Long operatorId; private String operatorName; private String operatorPwd; private Long isAdmin; // Constructors /** default constructor */ public AbstractToperator() { } /** minimal constructor */ public AbstractToperator(Long operatorId) { this.operatorId = operatorId; } /** full constructor */ public AbstractToperator(Long operatorId, String operatorName, String operatorPwd, Long isAdmin) { this.operatorId = operatorId; this.operatorName = operatorName; this.operatorPwd = operatorPwd; this.isAdmin = isAdmin; } // Property accessors public Long getOperatorId() { return this.operatorId; } public void setOperatorId(Long operatorId) { this.operatorId = operatorId; } public String getOperatorName() { return this.operatorName; } public void setOperatorName(String operatorName) { this.operatorName = operatorName; } public String getOperatorPwd() { return this.operatorPwd; } public void setOperatorPwd(String operatorPwd) { this.operatorPwd = operatorPwd; } public Long getIsAdmin() { return this.isAdmin; } public void setIsAdmin(Long isAdmin) { this.isAdmin = isAdmin; }