@Getter和@Setter

@Getter和@Setter 出現的目的是
public int getFoo() {return foo;} 不需要在寫get 和 set 方法。

您可以使用@Getter或@Setter來註釋任何字段，以使lombok自動生成默認的getter / setter。

lombok生成的getter / setter方法默認作用域將是public
除非你明確指定一個AccessLevel

如下面的例子所示。作用域級別PUBLIC，PROTECTED，PACKAGE，和PRIVATE。

你也可以在class 上面放置@Getter和/或@Setter註釋。在這種情況下，就好像您使用註釋註釋該類中的所有非靜態字段。

使用了Lombok 代碼

import lombok.AccessLevel;
import lombok.Getter;
import lombok.Setter;

public class GetterSetterExample {
  /**
   * Age of the person. Water is wet.
   * 
   * @param age New value for this person's age. Sky is blue.
   * @return The current value of this person's age. Circles are round.
   */
  @Getter @Setter private int age = 10;

  /**
   * Name of the person.
   * -- SETTER --
   * Changes the name of this person.
   * 
   * @param name The new value.
   */
  @Setter(AccessLevel.PROTECTED) private String name;

  @Override public String toString() {
   return String.format("%s (age: %d)", name, age);
  }
}

默認的代碼是（未使用lombok）

public class GetterSetterExample {
  /**
   * Age of the person. Water is wet.
   */
  private int age = 10;

  /**
   * Name of the person.
   */
  private String name;

  @Override public String toString() {
    return String.format("%s (age: %d)", name, age);
  }

  /**
   * Age of the person. Water is wet.
   *
   * @return The current value of this person's age. Circles are round.
   */
 public int getAge() {
    return age;
  }

  /**
   * Age of the person. Water is wet.
   *
   * @param age New value for this person's age. Sky is blue.
   */
  public void setAge(int age) {
    this.age = age;
  }

  /**
   * Changes the name of this person.
   *
   * @param name The new value.
   */
  protected void setName(String name) {
    this.name = name;
  }
}

要在生成的方法上註釋，可以使用onMethod=@({@AnnotationsHere}); 將註釋放在生成的setter方法的唯一參數上，可以使用onParam=@({@AnnotationsHere})。小心！這是一個實驗功能。

getter / setter參數

lombok.AccessLevel value() default lombok.AccessLevel.PUBLIC;

lombok.Getter.AnyAnnotation[] onMethod() default {};

boolean lazy() default false;

getter / setter使用方法

package me.wonwoo;

import lombok.AccessLevel;
import lombok.Getter;
import lombok.NonNull;
import lombok.Setter;

import javax.persistence.Column;
import javax.persistence.Id;
import javax.validation.constraints.NotNull;



public class GetSetObject {

//  @Setter(onParam = @__({@NotNull}), onMethod = @__({@NotNull}))
  @Setter(onMethod = @__({@NotNull}))
//  @Getter(value = AccessLevel.PUBLIC, onMethod = @__({@NonNull, @Id}))
  private Long id;
//  @Getter
  @Getter(value = AccessLevel.PUBLIC, lazy = true)
  private final String name = expensive();

  private String expensive() {
    return "wonwoo";
  }
}

class GetSetObjectOnParam {
  private Long id;

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

class GetSetObjectOnMethod {
  private Long id;

  @Id
  @Column(name = "seq")
  Long getId() {
    return id;
  }
}

作者：二月長河
鏈接：https://www.jianshu.com/p/93353398e964
來源：簡書
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