构建者模式（Builder）示例代码

package com.test;

/**
 * Created by xiaonanhai on 2015/5/30.
 */
public class Builder {

    private String name;
    private int age;
    private String gender;

    private Builder(BuilderFactoryImpl builderFactoryImpl){

        this.name = builderFactoryImpl.name;
        this.age = builderFactoryImpl.age;
        this.gender = builderFactoryImpl.gender;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public String getGender() {
        return gender;
    }

    public static class BuilderFactoryImpl implements BuilderFactory{

        private String name;
        private int age;
        private String gender;

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

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

        public BuilderFactoryImpl setGender(String gender) {
            this.gender = gender;
            return this;
        }

        @Override
        public Builder build() {
            return new Builder(this);
        }
    }

    public interface BuilderFactory{

        Builder build();
    }

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

    public static void main(String[] args) {

        Builder builder = new Builder.BuilderFactoryImpl()
                .setName("小男孩")
                .setGender("男")
                .setAge(29)
                .build();
        System.out.println(builder.toString());
    }
}