Lombok
- 官網(wǎng):https://projectlombok.org/features/all
- 示例代碼倉庫 springboot-lombok-features
lombok install
maven install
<dependencies>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.22</version>
<scope>provided</scope>
</dependency>
</dependencies>
jdk9
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.22</version>
</path>
</annotationProcessorPaths>
IntelliJ IDEA install
從 2020.3 版本開始泰讽,Jetbrains IntelliJ IDEA 編輯器與 lombok 兼容斧蜕,無需插件叫确。 對于 2020.3 之前的版本惨驶,可以添加 Lombok IntelliJ 插件奥吩,為 IntelliJ 添加 lombok 支持:
- Go to
File > Settings > Plugins
- Click on
Browse repositories...
- Search for
Lombok Plugin
- Click on
Install plugin
- Restart IntelliJ IDEA
您還可以查看使用 Eclipse 和 IntelliJ 設(shè)置 Lombok铐料,這是一篇關(guān)于 baeldung 的博客文章吨枉。
other install
更多參考:lombok other install
lombok features
lombok 功能示例來源lombok官方文檔中的示例混埠,具體使用的細節(jié)請查看官方使用說明揍堰,此倉庫示例僅個人預(yù)研使用鹏浅。
代碼倉庫地址 springboot-lombok-features
@Data
現(xiàn)在一起:@ToString、@EqualsAndHashCode屏歹、@Getter 在所有字段上隐砸、@Setter 在所有非final最終字段上的快捷方式,以及@RequiredArgsConstructor蝙眶!
Lombok
@Data
public class DataExample {
private final String name;
@Setter(AccessLevel.PACKAGE)
private int age;
private double score;
private String[] tags;
@ToString(includeFieldNames = true)
@Data(staticConstructor = "of")
public static class Exercise<T> {
private final String name;
private final T value;
}
}
java
public class DataExample {
private final String name;
private int age;
private double score;
private String[] tags;
public DataExample(String name) {
this.name = name;
}
public String getName() {
return this.name;
}
void setAge(int age) {
this.age = age;
}
public int getAge() {
return this.age;
}
public void setScore(double score) {
this.score = score;
}
public double getScore() {
return this.score;
}
public String[] getTags() {
return this.tags;
}
public void setTags(String[] tags) {
this.tags = tags;
}
@Override
public String toString() {
return "DataExampleJava(" + this.getName() + ", " + this.getAge() + ", " + this.getScore() + ", " + Arrays.deepToString(this.getTags()) + ")";
}
protected boolean canEqual(Object other) {
return other instanceof DataExample;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof DataExample)) return false;
DataExample other = (DataExample) o;
if (!other.canEqual((Object) this)) return false;
if (this.getName() == null ? other.getName() != null : !this.getName().equals(other.getName())) return false;
if (this.getAge() != other.getAge()) return false;
if (Double.compare(this.getScore(), other.getScore()) != 0) return false;
if (!Arrays.deepEquals(this.getTags(), other.getTags())) return false;
return true;
}
@Override
public int hashCode() {
final int PRIME = 59;
int result = 1;
final long temp1 = Double.doubleToLongBits(this.getScore());
result = (result * PRIME) + (this.getName() == null ? 43 : this.getName().hashCode());
result = (result * PRIME) + this.getAge();
result = (result * PRIME) + (int) (temp1 ^ (temp1 >>> 32));
result = (result * PRIME) + Arrays.deepHashCode(this.getTags());
return result;
}
public static class Exercise<T> {
private final String name;
private final T value;
private Exercise(String name, T value) {
this.name = name;
this.value = value;
}
public static <T> Exercise<T> of(String name, T value) {
return new Exercise<T>(name, value);
}
public String getName() {
return this.name;
}
public T getValue() {
return this.value;
}
@Override
public String toString() {
return "Exercise(name=" + this.getName() + ", value=" + this.getValue() + ")";
}
protected boolean canEqual(Object other) {
return other instanceof Exercise;
}
@Override
public boolean equals(Object o) {
if (o == this) return true;
if (!(o instanceof Exercise)) return false;
Exercise<?> other = (Exercise<?>) o;
if (!other.canEqual((Object) this)) return false;
if (this.getName() == null ? other.getValue() != null : !this.getName().equals(other.getName()))
return false;
if (this.getValue() == null ? other.getValue() != null : !this.getValue().equals(other.getValue()))
return false;
return true;
}
@Override
public int hashCode() {
final int PRIME = 59;
int result = 1;
result = (result * PRIME) + (this.getName() == null ? 43 : this.getName().hashCode());
result = (result * PRIME) + (this.getValue() == null ? 43 : this.getValue().hashCode());
return result;
}
}
}
@Getter/@Setter
永遠不要再寫 public String getName() {return name;}
Lombok
public class GetterSetterExample {
@Getter
@Setter
private int age = 10;
@Setter(AccessLevel.PROTECTED)
private String name;
@Override
public String toString() {
return String.format("%s (age: %d)", name, age);
}
}
java
public class GetterSetterExample {
private int age = 10;
private String name;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
protected void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return String.format("%s (age: %d)", name, age);
}
}
@Builder
用于創(chuàng)建對象的無障礙花哨 API
Lombok
@Builder
public class BuilderExample {
@Builder.Default
private long created = System.currentTimeMillis();
private String name;
private int age;
@Singular
private Set<String> occupations;
}
java
public class BuilderExample {
private long created;
private String name;
private int age;
private Set<String> occupations;
BuilderExample(String name, int age, Set<String> occupations) {
this.name = name;
this.age = age;
this.occupations = occupations;
}
private static long $default$created() {
return System.currentTimeMillis();
}
public static BuilderExampleBuilder builder() {
return new BuilderExampleBuilder();
}
public static class BuilderExampleBuilder {
private long created;
private boolean created$set;
private String name;
private int age;
private java.util.ArrayList<String> occupations;
BuilderExampleBuilder() {
}
public BuilderExampleBuilder created(long created) {
this.created = created;
this.created$set = true;
return this;
}
public BuilderExampleBuilder name(String name) {
this.name = name;
return this;
}
public BuilderExampleBuilder age(int age) {
this.age = age;
return this;
}
public BuilderExampleBuilder occupation(String occupation) {
if (this.occupations == null) {
this.occupations = new java.util.ArrayList<String>();
}
this.occupations.add(occupation);
return this;
}
public BuilderExampleBuilder occupations(Collection<? extends String> occupations) {
if (this.occupations == null) {
this.occupations = new java.util.ArrayList<String>();
}
this.occupations.addAll(occupations);
return this;
}
public BuilderExampleBuilder clearOccupations() {
if (this.occupations != null) {
this.occupations.clear();
}
return this;
}
public BuilderExample build() {
Set<String> occupations = new HashSet<>();
return new BuilderExample(name, age, occupations);
}
@java.lang.Override
public String toString() {
return "BuilderExample.BuilderExampleBuilder(created = " + this.created + ", name = " + this.name + ", age = " + this.age + ", occupations = " + this.occupations + ")";
}
}
@NonNull
學(xué)會停止擔(dān)心并喜歡 NullPointerException
Lombok
public class NonNullExample extends Something {
private String name;
public NonNullExample(@NonNull Person person) {
super("Hello");
this.name = person.getName();
}
}
java
public class NonNullExample extends Something {
private String name;
public NonNullExample(Person person) {
super("Hello");
if (person == null) {
throw new NullPointerException("person is marked @NonNull but is null");
}
this.name = person.getName();
}
}
由于字?jǐn)?shù)限制季希,更多用法,參考代碼倉庫示例幽纷。
完整示例:
.
|-- BuilderExample.java
|-- CleanupExample.java
|-- ConstructorExample.java
|-- DataExample.java
|-- EqualsAndHashCodeExample.java
|-- GetterLazyExample.java
|-- GetterSetterExample.java
|-- LogExample.java
|-- LogExampleCategory.java
|-- LogExampleOther.java
|-- LombokFeaturesApplication.java
|-- NonNullExample.java
|-- SneakyThrowsExample.java
|-- SynchronizedExample.java
|-- ToStringExample.java
|-- ValExample.java
|-- ValueExample.java
|-- WithExample.java
|-- base
| |-- Person.java
| |-- Shape.java
| `-- Something.java
`-- java
|-- BuilderExample.java
|-- CleanupExample.java
|-- ConstructorExample.java
|-- DataExample.java
|-- EqualsAndHashCodeExample.java
|-- GetterLazyExample.java
|-- GetterSetterExample.java
|-- LogExample.java
|-- LogExampleCategory.java
|-- LogExampleOther.java
|-- NonNullExample.java
|-- SneakyThrowsExample.java
|-- SynchronizedExample.java
|-- ToStringExample.java
|-- ValExample.java
|-- ValueExample.java
`-- WithExample.java