设计模式--备忘录模式

1 将对象信息保存起来，可以以后将该对象恢复在保存之前的状态。

被保存的类：

public class GameRole {    // 攻击力    public Integer aggressivity;    // 防御力    public Integer defensive;    public GameRole(Integer aggressivity, Integer defensive) {        this.aggressivity = aggressivity;        this.defensive = defensive;    }    // 改变状态    public void fight() {        this.aggressivity = 0;        this.defensive = 0;    }    public RoleStateMemento saveState() {        return new RoleStateMemento(this.aggressivity, this.defensive);    }    public void recoveryState(RoleStateMemento roleStateMemento) {        this.aggressivity = roleStateMemento.getGameRole().aggressivity;        this.defensive = roleStateMemento.getGameRole().defensive;    }    public void displayer() {        System.out.println(aggressivity + "           " + defensive);    }}

信息存储箱

public class RoleStateMemento {    private GameRole gameRole;    public RoleStateMemento(Integer aggressivity, Integer defensive) {        gameRole = new GameRole(aggressivity, defensive);    }    public GameRole getGameRole() {        return gameRole;    }    public void setGameRole(GameRole gameRole) {        this.gameRole = gameRole;    }}

信息管理者

public class RoleStateCareTaker {    private RoleStateMemento roleStateMemento;    public RoleStateMemento getRoleStateMemento() {        return roleStateMemento;    }    public void setRoleStateMemento(RoleStateMemento roleStateMemento) {        this.roleStateMemento = roleStateMemento;    }}

测试：

public class TextMain {    public static void main(String[] args) {        GameRole gameRole = new GameRole(10, 10);        RoleStateCareTaker roleStateCareTaker = new RoleStateCareTaker();        RoleStateMemento roleStateMemento = gameRole.saveState();        roleStateCareTaker.setRoleStateMemento(roleStateMemento);        gameRole.displayer();        gameRole.fight();// 状态改变        gameRole.displayer();        gameRole.recoveryState(roleStateCareTaker.getRoleStateMemento());        gameRole.displayer();    }}