lombok注解的使用

@Data
最常用注解

@Data
public class Demo {private Long id;private String name;
}

编译后

    public class Demo {private Long id;private String name;public Demo() {}public Long getId() {return this.id;}public String getName() {return this.name;}public void setId(Long id) {this.id = id;}public void setName(String name) {this.name = name;}public boolean equals(Object o) {if (o == this) {return true;} else if (!(o instanceof Demo)) {return false;} else {Demo other = (Demo)o;if (!other.canEqual(this)) {return false;} else {Object this$id = this.getId();Object other$id = other.getId();if (this$id == null) {if (other$id != null) {return false;}} else if (!this$id.equals(other$id)) {return false;}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;}return true;}}}protected boolean canEqual(Object other) {return other instanceof Demo;}public int hashCode() {int PRIME = true;int result = 1;Object $id = this.getId();int result = result * 59 + ($id == null ? 43 : $id.hashCode());Object $name = this.getName();result = result * 59 + ($name == null ? 43 : $name.hashCode());return result;}public String toString() {return "Demo(id=" + this.getId() + ", name=" + this.getName() + ")";}}

@NonNull

    public void setId(@NonNull Long id) {this.id = id;}

编译后

    public void setId(@NonNull Long id) {if (id == null) {throw new NullPointerException("id");} else {this.id = id;}}

@RequiredArgsConstructor

@RequiredArgsConstructor
public class Demo {@NonNullprivate Long id;private String name;
}

编译后

public class Demo {@NonNullprivate Long id;private String name;public Demo(@NonNull Long id) {if (id == null) {throw new NullPointerException("id");} else {this.id = id;}}
}

@NoArgsConstructor @AllArgsConstructor

@NoArgsConstructor
@AllArgsConstructor
public class Demo {@NonNullprivate Long id;private String name;
}

编译后

public class Demo {@NonNullprivate Long id;private String name;public Demo() {}public Demo(@NonNull Long id, String name) {if (id == null) {throw new NullPointerException("id");} else {this.id = id;this.name = name;}}
}

@Builder

单独使用时自动生成全参的构造器，没有默认构造器了，想要有非全参构造器必须与@AllArgsConstructor注解同时使用,然后手动或注解添加,否则将无法编译

@Builder
public class Demo {@NonNullprivate Long id;private String name;
}

编译后

public class Demo {@NonNullprivate Long id;private String name;Demo(@NonNull Long id, String name) {if (id == null) {throw new NullPointerException("id");} else {this.id = id;this.name = name;}}public static Demo.DemoBuilder builder() {return new Demo.DemoBuilder();}public static class DemoBuilder {private Long id;private String name;DemoBuilder() {}public Demo.DemoBuilder id(Long id) {this.id = id;return this;}public Demo.DemoBuilder name(String name) {this.name = name;return this;}public Demo build() {return new Demo(this.id, this.name);}public String toString() {return "Demo.DemoBuilder(id=" + this.id + ", name=" + this.name + ")";}}
}

@Cleanup

自动调用close()

     public static void main(String[] args) throws FileNotFoundException,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);}}

编译后

    public static void main(String[] args) throws FileNotFoundException, 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();}}}

@Synchronized

给方法加锁

public class Demo {private final Object writeLock = new Object();@Synchronizedpublic static void method1(){System.out.println("method1");}@Synchronizedpublic void method2(){System.out.println("method1");}@Synchronized("writeLock")public void method3(){System.out.println("method1");}
}

编译后

public class Demo {private static final Object $LOCK = new Object[0];private final Object $lock = new Object[0];private final Object writeLock = new Object();public Demo() {}public static void method1() {Object var0 = $LOCK;synchronized($LOCK) {System.out.println("method1");}}public void method2() {Object var1 = this.$lock;synchronized(this.$lock) {System.out.println("method1");}}public void method3() {Object var1 = this.writeLock;synchronized(this.writeLock) {System.out.println("method1");}}
}

@Wither

给final赋值,必须有全参的构造器

@AllArgsConstructor
public class Demo {@Witherprivate final int number;}

编译后

public class Demo {private final int number;public Demo(int number) {this.number = number;}public Demo withNumber(int number) {return this.number == number ? this : new Demo(number);}
}

@Log4j2@Log@Log4j@CommonsLog@Slf4j@XSLF4j

@Log4j2
public class Demo {public static void main(String[] args) {log.error("error");}}

编译后

public class Demo {private static final Logger log = LogManager.getLogger(Demo.class);public Demo() {}public static void main(String[] args) {log.error("error");}
}

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lombok注解的使用

@NonNull

@RequiredArgsConstructor

@NoArgsConstructor @AllArgsConstructor

@Builder

@Cleanup

@Synchronized

@Wither

@Log4j2@Log@Log4j@CommonsLog@Slf4j@XSLF4j

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