本篇内容主要讲解“step-builder建造者模式是什么”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“step-builder建造者模式是什么”吧!

step-builder 建造者模式

• step-builder 建造者模式是链式建造者模式的近一步扩展, 能够按步骤实例化对象.

• 还是以建造一个Compute为例,代码如下↓↓↓

public class Computer {
    private String cpu;
    private String ram;
    private String screen;

    public String getCpu() {
        return cpu;
    }

    public void setCpu(String cpu) {
        this.cpu = cpu;
    }

    public String getRam() {
        return ram;
    }

    public void setRam(String ram) {
        this.ram = ram;
    }

    public String getScreen() {
        return screen;
    }

    public void setScreen(String screen) {
        this.screen = screen;
    }
}

public class ComputerBuilder {
    private ComputerBuilder() {}

    public static CpuStep getBuilder(){
        return new ComputerSteps();
    }

    interface CpuStep{
        RamStep withCpu(String cpu);
    }

    interface RamStep{
        ScreenStep withRam(String ram);
    }

    interface ScreenStep{
        BuildStep withScreen(String screen);
    }

    interface BuildStep{
        Computer build();
    }

    public static class ComputerSteps implements CpuStep,RamStep,ScreenStep,BuildStep{
       private Computer computer;

        public ComputerSteps() {
            this.computer = new Computer();
        }

        @Override
        public RamStep withCpu(String cpu) {
            this.computer.setCpu(cpu);
            return this;
        }

        @Override
        public ScreenStep withRam(String ram) {
            this.computer.setRam(ram);
            return this;
        }

        @Override
        public BuildStep withScreen(String screen) {
            this.computer.setScreen(screen);
            return this;
        }

        @Override
        public Computer build() {
            return this.computer;
        }
    }
}

public static void main(String[] args) {
        Computer computer = ComputerBuilder.getBuilder().withCpu("cpu型号").withRam("ram型号").withScreen("屏幕型号").build();
    }

• 将每一步抽象为一个接口, 完成第一步后返回的是下一步的接口,以此保证只能按照接口顺序执行.

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