建造者模式-创建型

建造者模式

借鉴于
参考地址

这里Director被省略

Builder为建筑后的产品Product

Inner为具体的建筑者ConcreteBuilder

Inner如果生成方法接口则为建造者Builder

//建筑者模式可以使用lombok @Data注解实现
public class Builder {
    private String name;
    private Integer age;
    //使用Inner对象接收参数
    public static Inner builder() {
       return new Inner();
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
    //inner可以被替换为一个与Builder同成员变量类 即Inner替换为外部类其他不变
    private static class Inner{
        private String name;
        private Integer age;

        public Inner name(String name) {
            this.name=name;
            return this;
        }
        public Inner age(Integer age) {
            this.age=age;
            return this;
        }
        //build返回参数
        public Builder build() {
            Builder builder = new Builder();
            builder.setName(this.name);
            builder.setAge(this.age);
            return builder;
        }

    }
    
    @Override
    public String toString() {
        return "Builder{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    public static void main(String[] args) {
        Builder a = Builder.builder().name("a").age(123).build();;
        System.out.println(a);

    }
}