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建造者模式是一种创建型设计模式, 旨在将复杂对象的构建过程与其表示分离, 使同样的构建过程可以构建不同的表示. 建造者模式主要用于以下情况:
// 产品类 public 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; } @Override public String toString() { return "Product [partA=" + partA + ", partB=" + partB + ",partC=" + partC + "]"; } } // 抽象建造者 public 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 public class ConcreteBuilder extends Builder { @Override public void buildPartA() { product.setPartA("Part A"); } @Override public void buildPartB() { product.setPartA("Part B"); } @Override public void buildPartC() { product.setPartA("Part C"); } } // 指挥者 public class Director { private Builder builder; public Director(Builder builder) { this.builder = builder } public void construct() { builder.buildPartA(); builder.buildPartB(); builder.buildPartC(); } }
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