建造者模式
- 开发中应用场景：
– StringBuilder类的append方法
– SQL中的PreparedStatement
– JDOM中，DomBuilder、SAXBuild
创作者模式
code
CPU
public class CPU {
private String name;
// Getter(), Setter(), toString()
}
风扇
public class Fan {
private String name;
// Getter(), Setter(), toString()
}
内存条
public class MemoryBar {
private String name;
// Getter(), Setter(), toString()
}
电脑
public class Computer {
private CPU cpu;
private MemoryBar memoryBar;
private Fan fan;
// Getter(), Setter(), toString()
}
构建者接口
public interface ComputerBuilder {
public CPU buildCpu();
public Fan buildFan();
public MemoryBar buildMemoryBar();
}
构建者实现类
public class ZnsdComputerBuilder implements ComputerBuilder {
@Override
public CPU buildCpu() {
System.out.println("构建 CPU");
return new CPU();
}
@Override
public Fan buildFan() {
System.out.println("构建 Fan");
return new Fan();
}
@Override
public MemoryBar buildMemoryBar() {
System.out.println("构建 MemoryBar");
return new MemoryBar();
}
}
组装者接口
public interface ComputerDirector {
Computer build();
}
组装者实现
public class ZnsdComputerDirector implements ComputerDirector {
private ComputerBuilder builder;
public ZnsdComputerDirector(ComputerBuilder builder) {
this.builder = builder;
}
@Override
public Computer build() {
CPU cpu = builder.buildCpu();
MemoryBar memoryBar = builder.buildMemoryBar();
Fan fan = builder.buildFan();
Computer computer = new Computer(cpu, memoryBar, fan);
return computer;
}
}
用户体验
public static void main(String[] args) {
ComputerDirector director = new ZnsdComputerDirector(new ZnsdComputerBuilder());
Computer computer = director.build();
System.out.println(computer);
}
