@Getter / @Setter
@Getter 和 @Setter，分别实现了 Gette r和 Setter 方法。
package com.huey.hello.bean; import java.util.Date; import lombok.Getter;
import lombok.Setter; public class Student { @Getter @Setter
private int studNo;
@Getter @Setter
private String studName;
@Getter @Setter
private Date birthday; public static void main(String[] args) {
Student stud = new Student();
stud.setStudName("huey");
System.out.println(stud.getStudName()); // [OUTPUT]: huey
}
}
@ToString
@ToString，实现了 toString() 方法。
package com.huey.hello.bean; import java.util.Date; import lombok.Getter;
import lombok.Setter;
import lombok.ToString; @ToString
public class Student { @Getter @Setter
private int studNo;
@Getter @Setter
private String studName;
@Getter @Setter
private Date birthday; public static void main(String[] args) {
Student stud = new Student();
stud.setStudNo(10001);
stud.setStudName("huey");
stud.setBirthday(new Date());
System.out.println(stud); // [OUTPUT]: Student(studNo=10001, studName=huey, birthday=Fri Jul 31 23:01:56 CST 2015)
}
}
@EqualsAndHashCode
@EqualsAndHashCode，实现了 equals() 和 hashCode() 方法。
package com.huey.hello.bean; import java.util.Date; import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.Setter; @EqualsAndHashCode
public class Student { @Getter @Setter
private int studNo;
@Getter @Setter
private String studName;
@Getter @Setter
private Date birthday; public static void main(String[] args) {
Student stud1 = new Student();
stud1.setStudNo(10001);
stud1.setStudName("huey");
stud1.setBirthday(new Date()); Student stud2 = new Student();
stud2.setStudNo(10001);
stud2.setStudName("huey");
stud2.setBirthday(new Date()); System.out.println(stud1.hashCode()); // [OUTPUT]: -349449895
System.out.println(stud2.hashCode()); // [OUTPUT]: -349449895
System.out.println(stud1.equals(stud2)); // [OUTPUT]: true
}
}
@Data
@Data，相当上述三个 annotation 以及 @RequiredArgsConstructor。
package com.huey.hello.bean; import java.util.Date; import lombok.Data; @Data
public class Student { private int studNo;
private String studName;
private Date birthday; public static void main(String[] args) {
Student stud1 = new Student();
stud1.setStudNo(10001);
stud1.setStudName("huey");
stud1.setBirthday(new Date()); Student stud2 = new Student();
stud2.setStudNo(10001);
stud2.setStudName("huey");
stud2.setBirthday(new Date()); System.out.println(stud1.hashCode()); // [OUTPUT]: -349006373
System.out.println(stud2.hashCode()); // [OUTPUT]: -349006373
System.out.println(stud1.equals(stud2)); // [OUTPUT]: true
System.out.println(stud1); // [OUTPUT]: Student(studNo=10001, studName=huey, birthday=Fri Jul 31 23:13:43 CST 2015)
}
}