1. val--自动生成泛型类的真实的数据类型
源码：
package com.test.lombok.val;import lombok.val;import java.util.ArrayList;import java.util.HashMap;public class LomBokVal { public String example(){ val example = new ArrayList (); example.add("hello world!"); val foo = example.get(0); return foo.toLowerCase(); } public void example2(){ val map = new HashMap (); map.put(0,"zero"); map.put(5,"five"); for (val entry : map.entrySet()){ System.out.printf("%d: %s\n",entry.getKey(),entry.getValue()); } } public static void main(String[] args){ LomBokVal lomBokVal = new LomBokVal(); System.out.println(lomBokVal.example()); lomBokVal.example2(); }} 编译后生成的class文件：
package com.test.lombok.val;import lombok.val;import java.util.ArrayList;import java.util.HashMap;public class LomBokVal { public String example(){ val example = new ArrayList (); example.add("hello world!"); val foo = example.get(0); return foo.toLowerCase(); } public void example2(){ val map = new HashMap (); map.put(0,"zero"); map.put(5,"five"); for (val entry : map.entrySet()){ System.out.printf("%d: %s\n",entry.getKey(),entry.getValue()); } } public static void main(String[] args){ LomBokVal lomBokVal = new LomBokVal(); System.out.println(lomBokVal.example()); lomBokVal.example2(); }} 2. var--自动生成泛型类的真实的数据类型
默认情况下该功能不启用，需要在配置文件lombok.config中进行配置：
源码：
package com.test.lombok.var;import lombok.experimental.var;import java.util.ArrayList;import java.util.HashMap;public class LomBokVar { public String example() { var example = new ArrayList (); example.add("hello world!"); var foo = example.get(0); return foo.toLowerCase(); } public void example2() { var map = new HashMap (); map.put(0, "zero"); map.put(5, "five"); for (var entry : map.entrySet()) { System.out.printf("%d: %s\n", entry.getKey(), entry.getValue()); } } public static void main(String[] args) { LomBokVar lomBokVar = new LomBokVar(); System.out.println(lomBokVar.example()); lomBokVar.example2(); }} 编译后生成的class文件：
//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.var;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.Map.Entry;public class LomBokVar { public LomBokVar() { } public String example() { ArrayList example = new ArrayList(); example.add("hello world!"); String foo = (String)example.get(0); return foo.toLowerCase(); } public void example2() { HashMap map = new HashMap(); map.put(0, "zero"); map.put(5, "five"); Iterator var2 = map.entrySet().iterator(); while(var2.hasNext()) { Entry entry = (Entry)var2.next(); System.out.printf("%d: %s\n", entry.getKey(), entry.getValue()); } } public static void main(String[] args) { LomBokVar lomBokVar = new LomBokVar(); System.out.println(lomBokVar.example()); lomBokVar.example2(); }} 3. @NonNull--自动生成非空校验，默认抛出NullPointerException异常
源码：
package com.test.lombok.NonNull;import lombok.NonNull;public class LomBokNonNull { public void example(@NonNull String name) { System.out.println("hello, " + name); } public static void main(String[] args) { LomBokNonNull lomBokNonNull = new LomBokNonNull(); lomBokNonNull.example("test"); try { lomBokNonNull.example(null); } catch (NullPointerException e) { System.out.println("param is not allowed to be null"); } }} 生成的class文件：
//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.NonNull;import lombok.NonNull;public class LomBokNonNull { public LomBokNonNull() { } public void example(@NonNull String name) { if (name == null) { throw new NullPointerException("name"); } else { System.out.println("hello, " + name); } } public static void main(String[] args) { LomBokNonNull lomBokNonNull = new LomBokNonNull(); lomBokNonNull.example("test"); try { lomBokNonNull.example((String)null); } catch (NullPointerException var3) { System.out.println("param is not allowed to be null"); } }} 可以在配置文件中配置抛出的异常类型：
lombok.nonNull.exceptionType = [NullPointerException | IllegalArgumentException] (默认: NullPointerException).
即使代码中存在null值的判断，仍会自动生成非空判断：
// 源码package com.test.lombok.NonNull;import lombok.NonNull;public class LomBokNonNull { public void example(@NonNull String name) { System.out.println("NonNull test start"); if (name == null) { System.out.println("hello, stranger"); return; } System.out.println("hello, " + name); } public static void main(String[] args) { LomBokNonNull lomBokNonNull = new LomBokNonNull(); lomBokNonNull.example("test"); try { lomBokNonNull.example(null); } catch (NullPointerException e) { System.out.println("param is not allowed to be null"); } }}// 生成的class文件//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.NonNull;import lombok.NonNull;public class LomBokNonNull { public LomBokNonNull() { } public void example(@NonNull String name) { if (name == null) { throw new NullPointerException("name"); } else { System.out.println("NonNull test start"); if (name == null) { System.out.println("hello, stranger"); } else { System.out.println("hello, " + name); } } } public static void main(String[] args) { LomBokNonNull lomBokNonNull = new LomBokNonNull(); lomBokNonNull.example("test"); try { lomBokNonNull.example((String)null); } catch (NullPointerException var3) { System.out.println("param is not allowed to be null"); } }} 4. @Cleanup--资源的自动管理
如果需要释放的资源没有对应的close方法，而是用其他的方法进行资源的释放，可以使用@Cleanup("methodName")来指明需要调用的方法名称
// 源码：package com.test.lombok.cleanup;import lombok.Cleanup;import java.io.*;public class LomBokCleanup { public static void main(String[] args) throws IOException { @Cleanup InputStream in = new FileInputStream(args[0]); @Cleanup OutputStream out = new FileOutputStream(args[1]); byte[] b = new byte[10000]; while (true) { int r = in.read(b); if (r == -1) break; out.write(b, 0, r); } }}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.cleanup;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.util.Collections;public class LomBokCleanup { public LomBokCleanup() { } public static void main(String[] args) throws IOException { FileInputStream in = new FileInputStream(args[0]); try { FileOutputStream out = new FileOutputStream(args[1]); try { byte[] b = new byte[10000]; while(true) { int r = in.read(b); if (r == -1) { return; } out.write(b, 0, r); } } finally { if (Collections.singletonList(out).get(0) != null) { out.close(); } } } finally { if (Collections.singletonList(in).get(0) != null) { in.close(); } } }} 5. @Getter/@Setter--生成get和set方法
// 源码：package com.test.lombok.getterAndSetter;import lombok.AccessLevel;import lombok.Getter;import lombok.Setter;public class LomBokGettertAndSetter { @Getter @Setter private int age = 10; @Setter(AccessLevel.PROTECTED) private String name; @Override public String toString() { return String.format("%s (age: %d)", name, age); } public static void main(String[] args) { LomBokGettertAndSetter lomBokGettertAndSetter = new LomBokGettertAndSetter(); lomBokGettertAndSetter.setName("test"); lomBokGettertAndSetter.setAge(10); System.out.println(lomBokGettertAndSetter.getAge()); System.out.println(lomBokGettertAndSetter.toString()); }}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.getterAndSetter;public class LomBokGettertAndSetter { private int age = 10; private String name; public LomBokGettertAndSetter() { } public String toString() { return String.format("%s (age: %d)", this.name, this.age); } public static void main(String[] args) { LomBokGettertAndSetter lomBokGettertAndSetter = new LomBokGettertAndSetter(); lomBokGettertAndSetter.setName("test"); lomBokGettertAndSetter.setAge(10); System.out.println(lomBokGettertAndSetter.getAge()); System.out.println(lomBokGettertAndSetter.toString()); } public int getAge() { return this.age; } public void setAge(int age) { this.age = age; } protected void setName(String name) { this.name = name; }} 6. ToString--自动重写toString方法
// 源码：package com.test.lombok.toString;import lombok.ToString;// exclude指出不在toString方法中打印出来的属性的名称@ToString(exclude = "id")public class LomBokToString { private static String excludeString = "exclude string"; private int id; private String name; private String[] tags; private Shape shape = new Square(4, 5); public static class Shape { } // callSuper标志是否调用父类的toString方法，includeFieldNames标志是否显示属性名称 @ToString(callSuper = false, includeFieldNames = true) public static class Square extends Shape { private final int width, height; public Square(int width, int height) { this.width = width; this.height = height; } } public static void main(String[] args) { LomBokToString lomBokToString = new LomBokToString(); System.out.println(lomBokToString.toString()); }}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.toString;import java.util.Arrays;public class LomBokToString { private static String excludeString = "exclude string"; private int id; private String name; private String[] tags; private LomBokToString.Shape shape = new LomBokToString.Square(4, 5); public LomBokToString() { } public static void main(String[] args) { LomBokToString lomBokToString = new LomBokToString(); System.out.println(lomBokToString.toString()); } public String toString() { return "LomBokToString(name=" + this.name + ", tags=" + Arrays.deepToString(this.tags) + ", shape=" + this.shape + ")"; } public static class Square extends LomBokToString.Shape { private final int width; private final int height; public Square(int width, int height) { this.width = width; this.height = height; } public String toString() { return "LomBokToString.Square(width=" + this.width + ", height=" + this.height + ")"; } } public static class Shape { public Shape() { } }} 7. @EuqalsAndHashCode--自动生成equals和hashcode方法（static和transient属性除外）
// 源码：package com.test.lombok.equalsAndHashCode;import lombok.EqualsAndHashCode;// exclude表示在equals和hashcode方法总不使用该属性@EqualsAndHashCode(exclude = {"id", "shape"})public class LomBokEqualsAndHashCode { private transient int transientVar = 10; private static String excludeString = "exclude string"; private int id; private String name; private double score; private String[] tags; private Shape shape = new Square(4, 5); public static class Shape { } // callSuper标志是否调用父类的equals和hashcode方法 @EqualsAndHashCode(callSuper = true) public static class Square extends Shape { private final int width, height; public Square(int width, int height) { this.width = width; this.height = height; } } public static void main(String[] args) { LomBokEqualsAndHashCode lomBokEqualsAndHashCode1 = new LomBokEqualsAndHashCode(); lomBokEqualsAndHashCode1.id = 1; LomBokEqualsAndHashCode lomBokEqualsAndHashCode2 = new LomBokEqualsAndHashCode(); lomBokEqualsAndHashCode1.id = 2; System.out.println(lomBokEqualsAndHashCode1.equals(lomBokEqualsAndHashCode2)); }}// class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.equalsAndHashCode;import java.util.Arrays;public class LomBokEqualsAndHashCode { private transient int transientVar = 10; private static String excludeString = "exclude string"; private int id; private String name; private double score; private String[] tags; private LomBokEqualsAndHashCode.Shape shape = new LomBokEqualsAndHashCode.Square(4, 5); public LomBokEqualsAndHashCode() { } public static void main(String[] args) { LomBokEqualsAndHashCode lomBokEqualsAndHashCode1 = new LomBokEqualsAndHashCode(); lomBokEqualsAndHashCode1.id = 1; LomBokEqualsAndHashCode lomBokEqualsAndHashCode2 = new LomBokEqualsAndHashCode(); lomBokEqualsAndHashCode1.id = 2; System.out.println(lomBokEqualsAndHashCode1.equals(lomBokEqualsAndHashCode2)); } public boolean equals(Object o) { if (o == this) { return true; } else if (!(o instanceof LomBokEqualsAndHashCode)) { return false; } else { LomBokEqualsAndHashCode other = (LomBokEqualsAndHashCode)o; if (!other.canEqual(this)) { return false; } else { label31: { Object this$name = this.name; Object other$name = other.name; if (this$name == null) { if (other$name == null) { break label31; } } else if (this$name.equals(other$name)) { break label31; } return false; } if (Double.compare(this.score, other.score) != 0) { return false; } else { return Arrays.deepEquals(this.tags, other.tags); } } } } protected boolean canEqual(Object other) { return other instanceof LomBokEqualsAndHashCode; } public int hashCode() { int PRIME = true; int result = 1; Object $name = this.name; int result = result * 59 + ($name == null ? 43 : $name.hashCode()); long $score = Double.doubleToLongBits(this.score); result = result * 59 + (int)($score >>> 32 ^ $score); result = result * 59 + Arrays.deepHashCode(this.tags); return result; } public static class Square extends LomBokEqualsAndHashCode.Shape { private final int width; private final int height; public Square(int width, int height) { this.width = width; this.height = height; } public boolean equals(Object o) { if (o == this) { return true; } else if (!(o instanceof LomBokEqualsAndHashCode.Square)) { return false; } else { LomBokEqualsAndHashCode.Square other = (LomBokEqualsAndHashCode.Square)o; if (!other.canEqual(this)) { return false; } else if (!super.equals(o)) { return false; } else if (this.width != other.width) { return false; } else { return this.height == other.height; } } } protected boolean canEqual(Object other) { return other instanceof LomBokEqualsAndHashCode.Square; } public int hashCode() { int PRIME = true; int result = super.hashCode(); result = result * 59 + this.width; result = result * 59 + this.height; return result; } } public static class Shape { public Shape() { } }} 8. @NoArgsConstructor, @RequiredArgsConstructor, @AllArgsConstructor--自动生成构造函数
// 源码：package com.test.lombok.constructor;import lombok.*;// 当class中包含final修饰的属性时，属性必须进行初始化，否则使用@NoArgsConstructor时将会出现错误，// 需要使用@NoArgsConstructor(force = true)对未初始化的数据进行强制初始化为0/false/null// 若该属性使用@NonNull进行标记，将不会生成null检查@NoArgsConstructor(force = true)@RequiredArgsConstructor(staticName = "of")@AllArgsConstructor(access = AccessLevel.PROTECTED)public class LomBokConstructor { private final int id; private int x,y; @NonNull private String name;}// 生成的class文件//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.constructor;import lombok.NonNull;public class LomBokConstructor { private final int id; private int x; private int y; @NonNull private String name; public LomBokConstructor() { this.id = 0; } private LomBokConstructor(int id, @NonNull String name) { if (name == null) { throw new NullPointerException("name"); } else { this.id = id; this.name = name; } } public static LomBokConstructor of(int id, @NonNull String name) { return new LomBokConstructor(id, name); } protected LomBokConstructor(int id, int x, int y, @NonNull String name) { if (name == null) { throw new NullPointerException("name"); } else { this.id = id; this.x = x; this.y = y; this.name = name; } }} 9. @Data
//源码：package com.test.lombok.data;import lombok.AccessLevel;import lombok.Data;import lombok.NonNull;import lombok.Setter;/** * @ToString, @EqualsAndHashCode, 所有属性@Getter, 所有非final属性@Setter, @RequiredArgsConstructor的简写 * @Data 无法使用相关注解的属性 */@Data(staticConstructor = "of")public class LomBokData { private int id; @NonNull private String name; @Setter(AccessLevel.PACKAGE) private int age;}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.data;import lombok.NonNull;public class LomBokData { private int id; @NonNull private String name; private int age; private LomBokData(@NonNull String name) { if (name == null) { throw new NullPointerException("name"); } else { this.name = name; } } public static LomBokData of(@NonNull String name) { return new LomBokData(name); } public int getId() { return this.id; } @NonNull public String getName() { return this.name; } public int getAge() { return this.age; } public void setId(int id) { this.id = id; } public void setName(@NonNull String name) { if (name == null) { throw new NullPointerException("name"); } else { this.name = name; } } public boolean equals(Object o) { if (o == this) { return true; } else if (!(o instanceof LomBokData)) { return false; } else { LomBokData other = (LomBokData)o; if (!other.canEqual(this)) { return false; } else if (this.getId() != other.getId()) { return false; } else { Object this$name = this.getName(); Object other$name = other.getName(); if (this$name == null) { if (other$name == null) { return this.getAge() == other.getAge(); } } else if (this$name.equals(other$name)) { return this.getAge() == other.getAge(); } return false; } } } protected boolean canEqual(Object other) { return other instanceof LomBokData; } public int hashCode() { int PRIME = true; int result = 1; int result = result * 59 + this.getId(); Object $name = this.getName(); result = result * 59 + ($name == null ? 43 : $name.hashCode()); result = result * 59 + this.getAge(); return result; } public String toString() { return "LomBokData(id=" + this.getId() + ", name=" + this.getName() + ", age=" + this.getAge() + ")"; } void setAge(int age) { this.age = age; }} 10. @Value
// 源码：package com.test.lombok.value;import lombok.ToString;import lombok.Value;import lombok.experimental.NonFinal;import lombok.experimental.Tolerate;/** * @Value 相当于final @ToString @EqualsAndHashCode * @AllArgsConstructor @FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE) @Getter的简写 */@Value(staticConstructor = "of")public class LomBokValue { String name; @NonFinal int age; double score; protected String[] tags; @Tolerate public LomBokValue(String name, double score, String[] tags) { this.name = name; this.score = score; this.tags = tags; } @ToString(includeFieldNames=true) @Value(staticConstructor="of") public static class Exercise { String name; T value; }}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.value;import java.util.Arrays;public final class LomBokValue { private final String name; private int age; private final double score; protected final String[] tags; public LomBokValue(String name, double score, String[] tags) { this.name = name; this.score = score; this.tags = tags; } private LomBokValue(String name, int age, double score, String[] tags) { this.name = name; this.age = age; this.score = score; this.tags = tags; } public static LomBokValue of(String name, int age, double score, String[] tags) { return new LomBokValue(name, age, score, tags); } public String getName() { return this.name; } public int getAge() { return this.age; } public double getScore() { return this.score; } public String[] getTags() { return this.tags; } public boolean equals(Object o) { if (o == this) { return true; } else if (!(o instanceof LomBokValue)) { return false; } else { LomBokValue other = (LomBokValue)o; Object this$name = this.getName(); Object other$name = other.getName(); if (this$name == null) { if (other$name != null) { return false; } } else if (!this$name.equals(other$name)) { return false; } if (this.getAge() != other.getAge()) { return false; } else if (Double.compare(this.getScore(), other.getScore()) != 0) { return false; } else if (!Arrays.deepEquals(this.getTags(), other.getTags())) { return false; } else { return true; } } } public int hashCode() { int PRIME = true; int result = 1; Object $name = this.getName(); int result = result * 59 + ($name == null ? 43 : $name.hashCode()); result = result * 59 + this.getAge(); long $score = Double.doubleToLongBits(this.getScore()); result = result * 59 + (int)($score >>> 32 ^ $score); result = result * 59 + Arrays.deepHashCode(this.getTags()); return result; } public String toString() { return "LomBokValue(name=" + this.getName() + ", age=" + this.getAge() + ", score=" + this.getScore() + ", tags=" + Arrays.deepToString(this.getTags()) + ")"; } public static final class Exercise { private final String name; private final T value; private Exercise(String name, T value) { this.name = name; this.value = value; } public static LomBokValue.Exercise of(String name, T value) { return new LomBokValue.Exercise(name, value); } public String getName() { return this.name; } public T getValue() { return this.value; } public boolean equals(Object o) { if (o == this) { return true; } else if (!(o instanceof LomBokValue.Exercise)) { return false; } else { LomBokValue.Exercise other = (LomBokValue.Exercise)o; Object this$name = this.getName(); Object other$name = other.getName(); if (this$name == null) { if (other$name != null) { return false; } } else if (!this$name.equals(other$name)) { return false; } Object this$value = this.getValue(); Object other$value = other.getValue(); if (this$value == null) { if (other$value != null) { return false; } } else if (!this$value.equals(other$value)) { return false; } return true; } } public int hashCode() { int PRIME = true; int result = 1; Object $name = this.getName(); int result = result * 59 + ($name == null ? 43 : $name.hashCode()); Object $value = this.getValue(); result = result * 59 + ($value == null ? 43 : $value.hashCode()); return result; } public String toString() { return "LomBokValue.Exercise(name=" + this.getName() + ", value=" + this.getValue() + ")"; } }} 11. @Builder
// 源码：package com.test.lombok.builder;import lombok.Builder;import lombok.Singular;import java.util.Set;@Builderpublic class LomBokBuilder { private String name; private int age; @Singular private Set occupations;}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.builder;import java.util.ArrayList;import java.util.Collection;import java.util.Collections;import java.util.LinkedHashSet;import java.util.Set;public class LomBokBuilder { private String name; private int age; private Set occupations; LomBokBuilder(String name, int age, Set occupations) { this.name = name; this.age = age; this.occupations = occupations; } public static LomBokBuilder.LomBokBuilderBuilder builder() { return new LomBokBuilder.LomBokBuilderBuilder(); } public static class LomBokBuilderBuilder { private String name; private int age; private ArrayList occupations; LomBokBuilderBuilder() { } public LomBokBuilder.LomBokBuilderBuilder name(String name) { this.name = name; return this; } public LomBokBuilder.LomBokBuilderBuilder age(int age) { this.age = age; return this; } public LomBokBuilder.LomBokBuilderBuilder occupation(String occupation) { if (this.occupations == null) { this.occupations = new ArrayList(); } this.occupations.add(occupation); return this; } public LomBokBuilder.LomBokBuilderBuilder occupations(Collection occupations) { if (this.occupations == null) { this.occupations = new ArrayList(); } this.occupations.addAll(occupations); return this; } public LomBokBuilder.LomBokBuilderBuilder clearOccupations() { if (this.occupations != null) { this.occupations.clear(); } return this; } public LomBokBuilder build() { Set occupations; switch(this.occupations == null ? 0 : this.occupations.size()) { case 0: occupations = Collections.emptySet(); break; case 1: occupations = Collections.singleton(this.occupations.get(0)); break; default: Set occupations = new LinkedHashSet(this.occupations.size() < 1073741824 ? 1 + this.occupations.size() + (this.occupations.size() - 3) / 3 : 2147483647); occupations.addAll(this.occupations); occupations = Collections.unmodifiableSet(occupations); } return new LomBokBuilder(this.name, this.age, occupations); } public String toString() { return "LomBokBuilder.LomBokBuilderBuilder(name=" + this.name + ", age=" + this.age + ", occupations=" + this.occupations + ")"; } }} 12. @SneakyThrows
// 源码：package com.test.lombok.sneakyThrows;import lombok.SneakyThrows;import java.io.UnsupportedEncodingException;public class LomBokSneakyThrows implements Runnable { @SneakyThrows(UnsupportedEncodingException.class) public String utf8ToString(byte[] bytes) { return new String(bytes, "UTF-8"); } @SneakyThrows public void run() { throw new Throwable(); }}// 生成的class文件//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.sneakyThrows;import java.io.UnsupportedEncodingException;public class LomBokSneakyThrows implements Runnable { public LomBokSneakyThrows() { } public String utf8ToString(byte[] bytes) { try { return new String(bytes, "UTF-8"); } catch (UnsupportedEncodingException var3) { throw var3; } } public void run() { try { throw new Throwable(); } catch (Throwable var2) { throw var2; } }} 13. @Synchronized
// 源码：package com.test.lombok.synchronize;import lombok.Synchronized;/** * @Synchronized 是synchronized method修饰符的另一种形式. 可以用在静态方法或者实例方法上 * 作用与synchronize类似，synchronize锁定当前对象this，注解锁定不同的对象 */public class LomBokSynchronize { private final Object readLock = new Object(); @Synchronized public static void hello() { System.out.println("world"); } @Synchronized public int answerToLife() { return 42; } @Synchronized("readLock") public void foo() { System.out.println("bar"); }}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.synchronize;public class LomBokSynchronize { private static final Object $LOCK = new Object[0]; private final Object $lock = new Object[0]; private final Object readLock = new Object(); public LomBokSynchronize() { } public static void hello() { Object var0 = $LOCK; synchronized($LOCK) { System.out.println("world"); } } public int answerToLife() { Object var1 = this.$lock; synchronized(this.$lock) { return 42; } } public void foo() { Object var1 = this.readLock; synchronized(this.readLock) { System.out.println("bar"); } }} 14. @Getter(lazy=true)
// 源码：package com.test.lombok.getterLazy;import lombok.Getter;public class LomBokGetterLazy { @Getter(lazy=true) private final double[] cached = expensive(); private double[] expensive() { double[] result = new double[1000000]; for (int i = 0; i < result.length; i++) { result[i] = Math.asin(i); } return result; }}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.getterLazy;import java.util.concurrent.atomic.AtomicReference;public class LomBokGetterLazy { private final AtomicReference 15. @Log
// 源码：package com.test.lombok.log;import lombok.extern.java.Log;@Logpublic class LomBokLog { public static void main(String... args) { log.info("Something's wrong here"); }}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.log;import java.util.logging.Logger;public class LomBokLog { private static final Logger log = Logger.getLogger(LomBokLog.class.getName()); public LomBokLog() { } public static void main(String... args) { log.info("Something's wrong here"); }} 16. experiment
(1) @Accessor
// 源码：package com.test.lombok.accessor;import lombok.Getter;import lombok.Setter;import lombok.experimental.Accessors;@Accessors(fluent = true)public class LomBokAccessor { @Getter @Setter private int age = 10;}class PrefixExample { @Accessors(prefix = "f") @Getter @Setter private String fName = "Hello, World!";}// 生成的class文件：//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.accessor;public class LomBokAccessor { private int age = 10; public LomBokAccessor() { } public int age() { return this.age; } public LomBokAccessor age(int age) { this.age = age; return this; }}//// Source code recreated from a .class file by IntelliJ IDEA// (powered by Fernflower decompiler)//package com.test.lombok.accessor;class PrefixExample { private String fName = "Hello, World!"; PrefixExample() { } public String getName() { return this.fName; } public void setName(String fName) { this.fName = fName; }}