1、@Data注解是lombok.jar包下的注解，该注解通常用在实体bean上，不需要写出set和get方法，但是具备实体bean所具备的方法，简化编程提高变成速度。
2、@Data相当于@Getter @Setter @RequiredArgsConstructor @ToString @EqualsAndHashCode这5个注解的合集。
使用@Data注解前
private String yhz;
public String getYhz() {
return yhz;
}
public void setYhz(String yhz) {
this.yhz = yhz;
}
使用@Data注解后
@Data
public class Class {
private String yhz;
}
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