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  • Lombok(1.14.8)

    @NoArgsConstructor

    @NoArgsConstructor,提供一个无参的构造方法。

    package com.huey.hello.bean;
    
    import java.util.Date;
    
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @NoArgsConstructor
    @Data
    public class Student {
    
        private int studNo;
        private String studName;
        private Date birthday;
    
        // 提供了一个含参构造方法,就不会再默认提供无参构造方法
        public Student(int studNo, String studName, Date birthday) {
            super();
            this.studNo = studNo;
            this.studName = studName;
            this.birthday = birthday;
        }
    
        public static void main(String[] args) {
            Student stud = new Student();
            stud.setStudNo(10001);
            stud.setStudName("huey");
            stud.setBirthday(new Date());
            System.out.println(stud);     // [OUTPUT]: Student(studNo=10001, studName=huey, birthday=Sat Aug 01 00:03:43 CST 2015)
        }
    }

    @RequiredArgsConstructor

    @RequiredArgsConstructor,为所有 final 和 @NonNull 修饰的字段生成一个构造方法。

    package com.huey.lombok;
    
    import lombok.Getter;
    import lombok.NonNull;
    import lombok.RequiredArgsConstructor;
    import lombok.Setter;
    
    @RequiredArgsConstructor
    public class RequiredArgsConstructorExample {
    
        @Getter
        private final String finalField;
        @NonNull
        @Getter @Setter
        private String nonNullField;
        @Getter @Setter
        private String commonField;
        
        public static void main(String[] args) {
            RequiredArgsConstructorExample foo = new RequiredArgsConstructorExample("FINAL FIELD", "NON NULL FIELD");        
            System.out.println(foo.getFinalField());      // [OUTPUT]: FINAL FIELD
            System.out.println(foo.getNonNullField());    // [OUTPUT]: NON NULL FIELD
        }
        
    }

    @AllArgsConstructor

    @AllArgsConstructor,提供一个全参的构造方法。

    package com.huey.hello.bean;
    
    import java.util.Date;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    
    @AllArgsConstructor
    @Data
    public class Student {
    
        private int studNo;
        private String studName;
        private Date birthday;
        
        public static void main(String[] args) {
            Student stud = new Student(10001, "huey", new Date());
            System.out.println(stud);        // [OUTPUT]: Student(studNo=10001, studName=huey, birthday=Sat Aug 01 00:03:43 CST 2015)                        
        }
    }
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  • 原文地址:https://www.cnblogs.com/huey/p/4693484.html
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