Eclipse中Lombok的安装和注解说明

Posted 2021-01-25 gdjlc

Lombok 可用来帮助开发人员消除 Java 的重复代码，尤其是对于简单的 Java 对象（POJO），比如说getter/setter/toString等方法的编写。它通过注解实现这一目的。

官网：https://projectlombok.org

一、Eclipse中Lombok的安装

1、官网下载jar包当前版本是1.18.4，下载下来是一个lombok.jar

2、将lombok.jar移到eclipse的安装目录，即eclipse.in的同级目录

3、在eclipse.in文件最后加入下面两行

-Xbootclasspath/a:lombok.jar
-javaagent:lombok.jar

备注：
如果使用Lombok程序报错，可以点击eclipse菜单的Project选项的clean，清理一下即可。

二、Lombok注解说明

注解详见官网https://projectlombok.org/features/all

val

Finally! Hassle-free final local variables.

var

Mutably! Hassle-free local variables.

@NonNull

or: How I learned to stop worrying and love the NullPointerException.

@Cleanup

Automatic resource management: Call your close() methods safely with no hassle.

@Getter/@Setter

Never write public int getFoo() {return foo;} again.

@ToString

No need to start a debugger to see your fields: Just let lombok generate a toString for you!

@EqualsAndHashCode

Equality made easy: Generates hashCode and equals implementations from the fields of your object..

@NoArgsConstructor, @RequiredArgsConstructor and @AllArgsConstructor

Constructors made to order: Generates constructors that take no arguments, one argument per final / non-nullfield, or one argument for every field.

@Data

All together now: A shortcut for @ToString, @EqualsAndHashCode, @Getter on all fields, and @Setter on all non-final fields, and @RequiredArgsConstructor!

@Value

Immutable classes made very easy.

@Builder

... and Bob‘s your uncle: No-hassle fancy-pants APIs for object creation!

@SneakyThrows

To boldly throw checked exceptions where no one has thrown them before!

@Synchronized

synchronized done right: Don‘t expose your locks.

@Getter(lazy=true)

Laziness is a virtue!

@Log

Captain‘s Log, stardate 24435.7: "What was that line again?"

experimental

Head to the lab: The new stuff we‘re working on.