构建者模式第二种方式

/**
 * 建造者
 */
public abstract class Builder {
    public abstract Builder buildA(String s);
    public abstract Builder buildB(String s);
    public abstract Builder buildC(String s);
    public abstract Product build();
}

public class ConcreteBuilder extends Builder {
    private Product product;
    public ConcreteBuilder() {
        product = new Product();
    }
    @Override
    public Builder buildA(String s) {
        product.setBuildA(s);
        return this;
    }
    @Override
    public Builder buildB(String s) {
        product.setBuildB(s);
        return this;
    }
    @Override
    public Builder buildC(String s) {
        product.setBuildC(s);
        return this;
    }
    @Override
    public Product build() {
        return product;
    }
}

public class Product {
    private String buildA="汉堡";
    private String buildB="饮料";
    private String buildC="薯条";
    public String getBuildA() {
        return buildA;
    }
    public void setBuildA(String buildA) {
        this.buildA = buildA;
    }
    public String getBuildB() {
        return buildB;
    }
    public void setBuildB(String buildB) {
        this.buildB = buildB;
    }
    public String getBuildC() {
        return buildC;
    }
    public void setBuildC(String buildC) {
        this.buildC = buildC;
    }
    @Override
    public String toString() {
        return "Product2{" +
                "buildA='" + buildA + '\'' +
                ", buildB='" + buildB + '\'' +
                ", buildC='" + buildC + '\'' +
                '}';
    }
}

public class TestProduct {
    public static void main(String[] args) {
        ConcreteBuilder concreteBuilder = new ConcreteBuilder();
        Product build = concreteBuilder.buildA("aa").buildB("bb").buildC("cc").build();
        // Product{buildA='aa', buildB='bb', buildC='cc'}
        System.out.println(build);
    }
}