Builder模式樣例

Builder模式是將一個複雜對象的構建與它的表示分離，使得同樣的構建過程可以創建不同的表示。

如下爲構建一個複雜的對象（已經刪除了很多屬性）

public class User {
    private String name;
    private int age;
    private boolean sex;
    private String address;
    private String company;

    public User(Builder builder){
        this.name = builder.name;
        this.age = builder.age;
        this.sex = builder.sex;
        this.address = builder.address;
        this.company = builder.company;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public boolean isSex() {
        return sex;
    }

    public String getAddress() {
        return address;
    }

    public String getCompany() {
        return company;
    }

    public static class Builder{
        private String name;
        private int age;
        private boolean sex;
        private String address;
        private String company;

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

        public Builder setAge(int age) {
            this.age = age;
            return this;
        }

        public Builder setSex(boolean sex) {
            this.sex = sex;
            return this;
        }

        public Builder setAddress(String address) {
            this.address = address;
            return this;
        }

        public Builder setCompany(String company) {
            this.company = company;
            return this;
        }

        public User build(){
            return new User(this);
        }
    }
}

測試代碼：

User user = new User.Builder().setName("kevin.yang").
setAge(18).setSex(true).setCompany("csdn").
setAddress("中國").build();