写一个建造者模式的代码实例

好的，下面给您展示一个简单的建造者模式的代码实例：

// 产品类
class Product {
    private String partA;
    private String partB;
    private String partC;
 
    public void setPartA(String partA) {
        this.partA = partA;
    }
    
    public void setPartB(String partB) {
        this.partB = partB;
    }
    
    public void setPartC(String partC) {
        this.partC = partC;
    }
    
    public void show() {
        System.out.println("Part A: " + partA);
        System.out.println("Part B: " + partB);
        System.out.println("Part C: " + partC);
    }
}
 
// 抽象建造者
abstract class Builder {
    protected Product product = new Product();
 
    public abstract void buildPartA();
    public abstract void buildPartB();
    public abstract void buildPartC();
 
    public Product getResult() {
        return product;
    }
}
 
// 具体建造者
class ConcreteBuilder extends Builder {
    public void buildPartA() {
        product.setPartA("A");
    }
 
    public void buildPartB() {
        product.setPartB("B");
    }
 
    public void buildPartC() {
        product.setPartC("C");
    }
}
 
// 导演类
class Director {
    private Builder builder;
 
    public Director(Builder builder) {
        this.builder = builder;
    }
 
    public void construct() {
        builder.buildPartA();
        builder.buildPartB();
        builder.buildPartC();
    }
}
 
// 客户端类
public class BuilderPatternDemo {
    public static void main(String[] args) {
        Builder builder = new ConcreteBuilder();
        Director director = new Director(builder);
        director.construct();
 
        Product product = builder.getResult();
        product.show();
    }
}

该代码实例演示了建造者模式的基本使用，通过建造者分步创建复杂的产品对象，并且可以改变产品对象的内部表示。希望对您有所帮助！