Lombok简化编码使用

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.20</version>
    <scope>provided</scope>
</dependency>

val example = new ArrayList<String>();
example.add("hello");
example.add("lombok");
val element = example.get(0);

final ArrayList<String> example = new ArrayList<String>();
example.add("hello");
example.add("lombok");
final String element = example.get(0);

public NonNullExample(@NonNull Person person) {
    this.name = person.getName();
}

public NonNullExample(@NonNull Person person) {
    if(person == null) {
        throw new NullPointException("person");
    }
    this.name = person.getName();
}

public static void tradition() {
		InputStream in = null;
		OutputStream out = null;
		try {
			in = new FileInputStream("test.txt");
			out = new FileOutputStream("output.txt");
			byte[] buffer = new byte[1024];
			int begin = 0;
			while (true) {
				int len = in.read(buffer);
				if (len == -1)
					break;
				out.write(buffer, begin, len);
				begin += len;
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (out != null) {
				try {
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (in != null) {
				try {
					in.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}
	public static void tryWithResource() {
		try (InputStream in = new FileInputStream("test.txt"); 
			OutputStream out = new FileOutputStream("output.txt")) {
			byte[] buffer = new byte[1024];
			int begin = 0;
			while (true) {
				int len = in.read(buffer);
				if (len == -1)
					break;
				out.write(buffer, begin, len);
				begin += len;
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	public static void cleanUp() {
		try {
			@Cleanup InputStream in = new FileInputStream("test.txt");
			@Cleanup OutputStream out = new FileOutputStream("output.txt");
			byte[] buffer = new byte[1024];
			int begin = 0;
			while (true) {
				int len = in.read(buffer);
				if (len == -1)
					break;
				out.write(buffer, begin, len);
				begin += len;
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

@Getter 
@Setter(AccessLevel.PROTECTED) 
private String password;

@Getter(lazy = true)
private final double[] cached = expensive();
private double[] expensive() {
	long begin = System.currentTimeMillis();
	double[] result = new double[5];
	for (int i = 0; i < result.length; i++) {
		result[i] = Math.asin(i);
		try {
			Thread.sleep(1000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	System.out.println((System.currentTimeMillis() - begin) / 1000);
	return result;
}
public static void main(String[] args) {
	GetterLazyExample example = new GetterLazyExample();
	System.out.println(example.getCached());
	System.out.println(example.getCached());
}

private final AtomicReference<Object> cached = new AtomicReference<>();
public double[] getCached() {
	Object value = this.cached.get();
	if (value == null) {
		synchronized (this.cached) {
			value = this.cached.get();
			if (value == null) {
				final double[] actualValue = expensive();
				value = actualValue == null ? this.cached : actualValue;
				this.cached.set(value);
			}
		}
	}
	return (double[]) (value == this.cached ? null : value);
}
private double[] expensive() {
	long begin = System.currentTimeMillis();
	double[] result = new double[5];
	for (int i = 0; i < result.length; i++) {
		result[i] = Math.asin(i);
		try {
			Thread.sleep(1000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	System.out.println((System.currentTimeMillis() - begin) / 1000);
	return result;
}
public static void main(String[] args) {
	GetterLazyExample_Src example = new GetterLazyExample_Src();
	System.out.println(example.getCached());
	System.out.println(example.getCached());
}

// @ToString // 默认打印类名、每个字段名=值，用逗号分隔
// @ToString(exclude="password") //exclude属性指定排除哪些字段
@ToString(callSuper = true,includeFieldNames=true)
public class ToStringExample extends Parent {
	@Getter
	@Setter
	private String name;
	
	@Getter
	@Setter
	private String password;
	
	@Getter
	@Setter
	private int age;
	public static void main(String[] args) {
		System.out.println(new ToStringExample());
	}
}
@ToString
class Parent {
	@Getter
	@Setter
	private String address;
	
	@Getter
	@Setter
	private String city;
}

@EqualsAndHashCode(exclude= {"name"})
public class EqualsAndHashCodeExample {
	@Getter 
	@Setter 
	private String name;
	
	@Getter 
	@Setter 
	private int age;
		
	@Getter 
	@Setter 
	private double weight;
	public static void main(String[] args) {
		EqualsAndHashCodeExample example1 = new EqualsAndHashCodeExample();
		example1.setName("小明");
		example1.setAge(10);
		
		EqualsAndHashCodeExample example2 = new EqualsAndHashCodeExample();
		
		example2.setName("小红");
		example2.setAge(10);
		
		System.out.println(example1.hashCode());
		System.out.println(example2.hashCode());
		System.out.println(example1.equals(example2));
	}
}

@NoArgsConstructor
public class NoArgsConstructorExample {
	@Getter 
	@Setter 
	private String name;
}

public class NoArgsConstructorExample {
    private String name;
    public NoArgsConstructorExample() {
        //public无参构造器
    }
    //省略getter、setter方法
    ......
}

@RequiredArgsConstructor
public class RequiredArgsConstructorExample {
	@Getter 
	@Setter 
	@NonNull 
	private String name;
	
	@Getter 
	@Setter 
	private String password;
	
	@Getter 
	@Setter 
	@NonNull
	private Character sex;
}

public class RequiredArgsConstructorExample {
    private String name;
    private String password;
    private Character sex;
    
    private RequiredArgsConstructorExample(String name, Character sex) {
        if(name == null) {
            throw new NullPointerException("name");
        }
        if(sex == null) {
            throw new NullPointerException("sex");
        }
        this.name = name;
        this.sex = sex;
    }
    //省略getter、setter方法
    ......
}

@AllArgsConstructor
public class AllArgsContructorExample {
	@Getter 
	@Setter 
	private String name;
	
	@Getter 
	@Setter 
	private Integer age;
	
	@Getter 
	@Setter 
	private String address;
}

public class AllArgsContructorExample {
    private String name;
    private Integer age;
    private String address;
    
    public AllArgsContructorExample(String name, Integer age, String address) {
        this.name = name,
        this.age = age;
        this.address = address;
    }
    //省略getter、setter方法
    ......
}

@Data
public class DataExample {
	private String name;
	private int age;
	private String password;
}

@Value
public class NonFinalExample {
	private String id; //final
	
	private String name; //final
	
	@NonFinal 
	private String password; //非final
}

@Builder
 public class Example {
        private int foo;
        private final String bar;
 }

public class Example<T> {
    private T foo;
    private final String bar;
    private Example(T foo, String bar) {
            this.foo = foo;
            this.bar = bar;
    }
    public static <T> ExampleBuilder<T> builder() {
            return new ExampleBuilder<T>();
    }
    public static class ExampleBuilder<T> {
            private T foo;
            private String bar;
            private ExampleBuilder() {}
            public ExampleBuilder foo(T foo) {
                    this.foo = foo;
                    return this;
            }
            public ExampleBuilder bar(String bar) {
                    this.bar = bar;
                    return this;
            }
            @java.lang.Override 
            public String toString() {
                    return "ExampleBuilder(foo = " + foo + ", bar = " + bar + ")";
            }
            public Example build() {
                    return new Example(foo, bar);
            }
    }
}

public class SneakyThrowsExample {
	@SneakyThrows(UnsupportedEncodingException.class)
	public static String utf8ToString(byte[] bytes) {
		return new String(bytes, "UTF-8");
	}
	
	public static void main(String[] args) {
		String str = SneakyThrowsExample.utf8ToString("hello lomboks".getBytes());
		System.out.println(str);
	}
}

public class SynchronizedExample {
	private final Object readLock = new Object();
	
	@Synchronized("readLock")
	@SneakyThrows
	public void read() {
		System.out.println(Thread.currentThread().getName() + " read");
		Thread.sleep(3000);
	}
	
	public static void main(String[] args) {
		SynchronizedExample example = new SynchronizedExample();
		new Thread(()->example.read()).start();
		new Thread(()->example.read()).start();
	}
}

@CommonsLog(topic="LogExample")
//等价于
org.apache.commons.logging.LogFactory.getLog(LogExample.class);
@Log(topic="LogExample")
//等价于
java.util.loggin.Logger.getLogger(LogExample.class);
@Log4j(topic="LogExample")
//等价于
org.apache.log4j.Logger.getLogger(LogExample.class);
@Log4j2(topic="LogExample")
//等价于
org.apache.loggin.log4j.LogManager.getLoggerr(LogExample.class);
@Slf4j(topic="LogExample")
//等价于
org.slf4j.LoggerFactory.getLogger(LogExample.class);
@XSLf4j(topic="LogExample") 
//等价于
org.slf4j.ext.XLoggerFactory.getXLogger(LogExample.class);
@JBossLog(topic="LogExample") 
//等价于
org.jboss.logging.Logger.getLogger(LogExample.class);

@Data
@Builder
public class TolerateExample {
	private String name;
	private String age;
	@Tolerate
	public TolerateExample() {
	}
}

@UtilityClass
public class UtilityClassExample {
	private DateFormat df = new SimpleDateFormat("YYYY-MM-DD");
	
	public String formateToDay(Date date) {
		return df.format(date);
	}
}

public class UtilityClassExample {
	private static DateFormat df = new SimpleDateFormat("YYYY-MM-DD");
	
	public static String formateToDay(Date date) {
		return df.format(date);
	}
	
	private UtilityClassExample() {
		throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
	}
	
}

lombok.equalsAndHashCode.doNotUseGetters = [true | false] (default:false)

lombok.equalsAndHashCode.callSuper = [call | skip | warn] (default:warn)