【设计模式】【创建型5-4】【建造者模式】

建造者模式

可以在不同的构建过程中使用相同的建造者。

builder 链式调用创建对象就是建造者模式的使用

示例代码

public class Human {
    private int age;
    private String name;
    private int sex;
    @Override
    public String toString() {
        return "Human{" +
                "age=" + age +
                ", name='" + name + '\'' +
                ", sex=" + sex +
                '}';
    }
    public static void main(String[] args) {
        Human wangshilei = HumanBuilder.aHuman().withName("wangshilei").withAge(100).withSex(1).build();
        System.out.println(wangshilei);
    }
    public static final class HumanBuilder {
        private int age;
        private String name;
        private int sex;
        private HumanBuilder() {
        }
        public static HumanBuilder aHuman() {
            return new HumanBuilder();
        }
        public HumanBuilder withAge(int age) {
            this.age = age;
            return this;
        }
        public HumanBuilder withName(String name) {
            this.name = name;
            return this;
        }
        public HumanBuilder withSex(int sex) {
            this.sex = sex;
            return this;
        }
        public Human build() {
            Human human = new Human();
            human.age = this.age;
            human.sex = this.sex;
            human.name = this.name;
            return human;
        }
    }
}

//输出  Human{age=100, name='wangshilei', sex=1}

如上 就是实际的使用
构建复杂对象的时候使用 提高代码的可读性
我们可以隐藏构造细节。给外部提供简单的接口就能构建对象