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23种设计模式之builder设计模式

2018-01-25 09:35 218 查看

举一个列子，手机有很多小零件组成，这里我假设手机只有手机壳，电池和屏幕三个部分组成

电池

//电池
public class Battery {
String name;

public Battery(String name) {
this.name = name;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}

屏幕

//屏幕
public class Screen {
String name;

public Screen(String name) {
this.name = name;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}

手机壳

//手机壳
public class MobileShell {
String name;

public MobileShell(String name) {
this.name = name;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}

获得所有零件

//获得手机零件
public class Mobile {
Battery battery;
MobileShell shell;
Screen screen;

public Battery getBattery() {
return battery;
}

public void setBattery(Battery battery) {
this.battery = battery;
}

public MobileShell getShell() {
return shell;
}

public void setShell(MobileShell shell) {
this.shell = shell;
}

public Screen getScreen() {
return screen;
}

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

定义builder接口

public interface MobileBuilder {
Battery builderBattery();

MobileShell builderMobileShell();

Screen builderScreen();
}

定义一个director接口将手机装配起来

//把手机组装起来
public interface MobileDirector {
Mobile directorMobile();
}

建造一个vivo手机所有需要的零件

public class VivoMobileBuilder implements MobileBuilder {
@Override
public
bd60
Battery builderBattery() {
return new Battery("vivo电池");
}

@Override
public MobileShell builderMobileShell() {
return new MobileShell("vivo手机壳");
}

@Override
public Screen builderScreen() {
return new Screen("vivo屏幕");
}
}

将所有零件装配起来

public class VivoMobileDirector implements MobileDirector {
VivoMobileBuilder builder;

public VivoMobileDirector(VivoMobileBuilder builder) {
this.builder = builder;
}

@Override
public Mobile directorMobile() {
Battery battery = builder.builderBattery();
MobileShell mobileShell = builder.builderMobileShell();
Screen screen = builder.builderScreen();
//组装起来
Mobile mobile = new Mobile()
;
mobile.setBattery(battery);
mobile.setScreen(screen);
mobile.setShell(mobileShell);
return mobile;
}
}

测试

VivoMobileDirector director = new VivoMobileDirector(new VivoMobileBuilder());
Mobile mobile = director.directorMobile();
Screen screen = mobile.getScreen();
System.out.println( screen.getName()+mobile.getBattery().getName()+mobile.getShell().getName());

builder是将所有零件建造出来，director将所有东西装配起来

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