Builder Pattern - MacKittipat/note-design-pattern GitHub Wiki

• Handle complex multiple constructor
• Constructor with multiple parameter
• Immutable

public class MyBuilder {

    private String name;
    private String address;
    private int age;

    public MyBuilder(Builder builder) {
        this.name = builder.name;
        this.address = builder.address;
        this.age = builder.age;
    }

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

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

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

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

        public Builder() {}

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

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

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

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

    }

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