step-builder建造者模式是什么

本篇內(nèi)容主要講解“step-builder建造者模式是什么”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實(shí)用性強(qiáng)。下面就讓小編來帶大家學(xué)習(xí)“step-builder建造者模式是什么”吧!

step-builder 建造者模式

• step-builder 建造者模式是鏈?zhǔn)浇ㄔ煺吣Ｊ降慕徊綌U(kuò)展, 能夠按步驟實(shí)例化對(duì)象.

• 還是以建造一個(gè)Compute為例,代碼如下↓↓↓

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型號(hào)").withRam("ram型號(hào)").withScreen("屏幕型號(hào)").build();
    }

• 將每一步抽象為一個(gè)接口, 完成第一步后返回的是下一步的接口,以此保證只能按照接口順序執(zhí)行.

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