设计模式_14:备忘录模式

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我们玩单机RPG游戏的时候，通常会在打Boss前存个档，方便输掉的时候直接读取进度，这就是典型的备忘录模式:

public class Main {    public static void main(String[] args) {        GameRole hero = new GameRole();        RoleStateCaretaker roleStateCaretaker = new RoleStateCaretaker();        System.out.println(hero);        System.out.println("进度保存中...");        roleStateCaretaker.setRoleStateMemento(hero.saveState());        System.out.println("进度保存完成!去打Boss咯~");        hero.fightBoss();        System.out.print("打Boss后,");        System.out.println(hero);        System.out.println("读取进度中...");        hero.loadState(roleStateCaretaker.getRoleStateMemento());        System.out.println("读取进度完成!");        System.out.println(hero);    }}//游戏角色(Originator:存档发起人)class GameRole {    private int str;        //力    private int vit;        //体    private int def;        //防    public GameRole() {        this.str = 100;        this.vit = 100;        this.def = 100;    }    public int getStr() {        return str;    }    public void setStr(int str) {        this.str = str;    }    public int getVit() {        return vit;    }    public void setVit(int vit) {        this.vit = vit;    }    public int getDef() {        return def;    }    public void setDef(int def) {        this.def = def;    }    //保存状态    public RoleStateMemento saveState(){        return new RoleStateMemento(this.str, this.vit, this.def);    }    //读取状态    public void loadState(RoleStateMemento memento){        this.str = memento.getStr();        this.vit = memento.getVit();        this.def = memento.getDef();    }    //打后    public void fightBoss(){        this.str = 0;        this.vit = 0;        this.def = 0;    }    @Override    public String toString() {        return "当前角色状态:{" +                "str=" + str +                ", vit=" + vit +                ", def=" + def +                '}';    }}//角色状态存档(Memento:备忘录)class RoleStateMemento {    private int str;        //力    private int vit;        //体    private int def;        //防    public RoleStateMemento(int str, int vit, int def) {        this.str = str;        this.vit = vit;        this.def = def;    }    public int getStr() {        return str;    }    public int getVit() {        return vit;    }    public int getDef() {        return def;    }}//RoleStateCaretaker(Caretaker:备忘录管理者)class RoleStateCaretaker {    private RoleStateMemento memento;    public RoleStateMemento getRoleStateMemento() {        return memento;    }    public void setRoleStateMemento(RoleStateMemento memento) {        this.memento = memento;    }}

运行结果:

当前角色状态:{str=100, vit=100, def=100}进度保存中...进度保存完成!去打Boss咯~打Boss后:当前角色状态:{str=0, vit=0, def=0}读取进度中...读取进度完成!当前角色状态:{str=100, vit=100, def=100}

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