IDEA中Lombok插件

• Lombok
• • 一、作用
  • 二、注解
  • 三、使用步骤
  • • 1、在IDEA里安装插件（高版本IDEA已经自动安装好，直接使用即可）
    • 2、修改pom.xml文件，添加Lombok的jar包依赖，dependencies 标签内配置
    • 3、修改pojo包中的Shopping类
    • • 3.1、修改前
      • 3.2、修改后
    • 4、创建TestLombok测试类
    • • 4.1、修改前
      • 4.2、修改后

• 简化了Model层的代码的编写
• 以前pojo类/实体类，需要自己提供set、get、toString、equals、hashCode， Lombok通过各种注解，简化了以上操作

1. @Data：会自动生成set、get、toString、equals、hashCode
2. @NoArgsConstructor：自动生成无参构造
3. @AllArgsConstructor：自动生成全参构造
4. @Accessors(chain = true)：开启链式编程

 
 
          
               org.projectlombok
               lombok
               1.18.24
           
    

public class Shopping {

    private Integer id;
    private String name;
    private Double price;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Shopping{" +
                "id=" + id +
                ", name='" + name + ''' +
                ", price=" + price +
                '}';
    }
}

@Data   // 自动生成 get set toString equals hashCode
@NoArgsConstructor  // 自动生成无参构造
@AllArgsConstructor // 自动生成有参构造
@Accessors(chain = true)    // 开启链式编程
public class Shopping {

    private Integer id;
    private String name;
    private Double price;

}

public class TestLombok {

    @Test
    public void test(){
        Shopping shopping = new Shopping();
        shopping.setId(1);
        shopping.setName("辣条");
        shopping.setPrice(2.5);
        System.out.println(shopping.getId());
        System.out.println(shopping.getName());
        System.out.println(shopping.getPrice());
        System.out.println(shopping);
    }
}

public class TestLombok {

    @Test
    public void test02(){

        Shopping shopping = new Shopping();
        shopping.setId(2);
        shopping.setName("可乐");
        shopping.setPrice(3.5);
        System.out.println(shopping.getId());
        System.out.println(shopping.getName());
        System.out.println(shopping.getPrice());
        System.out.println(shopping);

        Shopping shopping1 = new Shopping(3,"雪碧",3.5);
        System.out.println(shopping1);

        Shopping shopping2 = new Shopping();
        // 使用 Lombok 的链式编程
        shopping2.setId(4).setName("鸡爪子").setPrice(2.5);
        System.out.println(shopping2);

    }
}