{"id":1122,"date":"2023-03-16T21:22:53","date_gmt":"2023-03-16T13:22:53","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1122"},"modified":"2023-04-29T10:16:48","modified_gmt":"2023-04-29T02:16:48","slug":"design-pattern-memo-mode","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/16\/design-pattern-memo-mode\/","title":{"rendered":"\u8bbe\u8ba1\u6a21\u5f0f\uff0813\uff09\u5907\u5fd8\u5f55\u6a21\u5f0f"},"content":{"rendered":"<p>\u5907\u5fd8\u5f55\u6a21\u5f0f\u662f\u4e00\u79cd\u884c\u4e3a\u6a21\u5f0f\uff0c\u8be5\u6a21\u5f0f\u7528\u4e8e\u4fdd\u5b58\u5bf9\u8c61\u5f53\u524d\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u5728\u4e4b\u540e\u53ef\u4ee5\u518d\u6b21\u6062\u590d\u5230\u6b64\u72b6\u6001\uff0c\u6709\u70b9\u50cf\u662f\u6211\u4eec\u5e73\u5e38\u8bf4\u7684\u201d\u540e\u6094\u836f\u201d\u3002<\/p>\n<p><!-- more --><\/p>\n<h2>\u5b9a\u4e49<\/h2>\n<p>\u5728\u4e0d\u7834\u574f\u5c01\u95ed\u7684\u524d\u63d0\u4e0b\uff0c\u6355\u83b7\u4e00\u4e2a\u5bf9\u8c61\u7684\u5185\u90e8\u72b6\u6001\uff0c\u5e76\u5728\u8be5\u5bf9\u8c61\u4e4b\u5916\u4fdd\u5b58\u8fd9\u4e2a\u72b6\u6001\uff0c\u8fd9\u6837\uff0c\u4ee5\u540e\u5c31\u53ef\u5c06\u8be5\u5bf9\u8c61\u6062\u590d\u5230\u539f\u5148\u4fdd\u5b58\u7684\u72b6\u6001\u3002<\/p>\n<h2>\u4f7f\u7528\u573a\u666f<\/h2>\n<ul>\n<li>\u9700\u8981\u4fdd\u5b58\u4e00\u4e2a\u5bf9\u8c61\u5728\u67d0\u4e00\u4e2a\u65f6\u523b\u7684\u72b6\u6001\u6216\u90e8\u5206\u72b6\u6001\u3002<\/li>\n<li>\u5982\u679c\u7528\u4e00\u4e2a\u63a5\u53e3\u6765\u8ba9\u5176\u4ed6\u5bf9\u8c61\u5f97\u5230\u8fd9\u4e9b\u72b6\u6001\uff0c\u5c06\u4f1a\u66b4\u9732\u5bf9\u8c61\u7684\u5b9e\u73b0\u7ec6\u8282\u5e76\u7834\u574f\u5bf9\u8c61\u7684\u5c01\u88c5\u6027\uff0c\u4e00\u4e2a\u5bf9\u8c61\u4e0d\u5e0c\u671b\u5916\u754c\u76f4\u63a5\u8bbf\u95ee\u5176\u5185\u90e8\u72b6\u6001\uff0c\u901a\u8fc7\u4e2d\u95f4\u5bf9\u8c61\u53ef\u4ee5\u95f4\u63a5\u8bbf\u95ee\u5176\u5185\u90e8\u72b6\u6001\u3002<\/li>\n<\/ul>\n<h2>\u7b80\u5355\u5b9e\u73b0<\/h2>\n<p>\u4e66\u4e2d\u4f8b\u5b50\uff1a\u4ee5\u201d\u4f7f\u547d\u53ec\u5524\u201d\u6e38\u620f\u4e3a\u4f8b\uff0c\u7528\u6e38\u620f\u4e2d\u7684\u5b58\u6863\u529f\u80fd\u6765\u4e3e\u4f8b\u3002<\/p>\n<p>\u9996\u5148\u662f\u5907\u5fd8\u5f55\u7c7b<\/p>\n<pre><code class=\"language-java\">\/**\n * \u5907\u5fd8\u5f55\u7c7b\n *\/\npublic class Memento {\n    public int mCheckpoint; \/\/\u6b66\u5668\n    public int mLiftValue; \/\/\u751f\u547d\n    public String mWeapon; \/\/\u5173\u5361\n\n    @Override\n    public String toString() {\n        return &quot;Memento [mCheckpoint=&quot; + mCheckpoint + &quot;,mLiftValue=&quot;\n                + mLiftValue + &quot;,mWeapon=&quot; + mWeapon + &quot;]&quot;;\n    }\n\n}<\/code><\/pre>\n<p>\u6e38\u620f\u7c7b\uff0c\u5728\u8be5\u7c7b\u53ef\u4ee5\u901a\u8fc7<code>createMemento<\/code>\u51fd\u6570\u6765\u521b\u5efa\u8be5\u7528\u6237\u7684\u5907\u5fd8\u5f55\u5bf9\u8c61\uff0c\u5916\u90e8\u53ef\u4ee5\u901a\u8fc7<code>restore<\/code>\u51fd\u6570\u5c06<code>CallOfDuty<\/code>\u5bf9\u8c61\u7684\u72b6\u6001\u4ece\u5907\u5fd8\u5f55\u5bf9\u8c61\u4e2d\u6062\u590d\u3002<\/p>\n<pre><code class=\"language-java\">\/**\n * \u7b80\u5355\u6a21\u62df\u201c\u4f7f\u547d\u53ec\u5524\u201d\u6e38\u620f \n *\/\npublic class CallOfDuty {\n\n    private int mCheckpoint = 1;\n    private int mLiftValue = 100;\n    private String mWeapon = &quot;\u6c99\u6f20\u4e4b\u9e70&quot;;\n\n    \/\/\u73a9\u6e38\u620f\n    public void play() {\n        System.out.println(&quot;\u6253\u6e38\u620f\uff1a&quot; + String.format(&quot;\u7b2c%d\u5173&quot;, mCheckpoint) + &quot;\u594b\u6218\u6740\u654c\u4e2d&quot;);\n        mLiftValue -= 10;\n        System.out.println(&quot;\u8fdb\u5ea6\u5347\u7ea7\u4e86&quot;);\n        mCheckpoint++;\n        System.out.println(&quot;\u5230\u8fbe&quot; + String.format(&quot;\u7b2c%d\u5173&quot;, mCheckpoint));\n    }\n\n    \/\/\u9000\u51fa\u6e38\u620f\n    public void quit() {\n        System.out.println(&quot;--------------&quot;);\n        System.out.println(&quot;\u9000\u51fa\u524d\u7684\u6e38\u620f\u5c5e\u6027\uff1a&quot; + this.toString());\n        System.out.println(&quot;\u9000\u51fa\u6e38\u620f&quot;);\n        System.out.println(&quot;--------------&quot;);\n    }\n\n    \/**\n     *\u521b\u5efa\u5907\u5fd8\u5f55 \n     *\/\n    public Memento createMemento() {\n        Memento memento = new Memento();\n        memento.mCheckpoint = mCheckpoint;\n        memento.mLiftValue = mLiftValue;\n        memento.mWeapon = mWeapon;\n        return memento;\n    }\n\n    \/\/\u6062\u590d\u6e38\u620f\n    public void restore(Memento memento) {\n        this.mCheckpoint = memento.mCheckpoint;\n        this.mLiftValue = memento.mLiftValue;\n        this.mWeapon = memento.mWeapon;\n        System.out.println(&quot;\u6062\u590d\u540e\u7684\u6e38\u620f\u5c5e\u6027\uff1a&quot; + this.toString());\n    }\n\n    \/\/\u7701\u7565getter\u548csetter\u65b9\u6cd5\n\n    @Override\n    public String toString() {\n        return &quot;CallOfDuty [mCheckpoint=&quot; + mCheckpoint + &quot;,mLiftValue=&quot;\n                + mLiftValue + &quot;,mWeapon=&quot; + mWeapon + &quot;]&quot;;\n    }\n}<\/code><\/pre>\n<p>\u5907\u5fd8\u5f55\u64cd\u4f5c\u7c7b\uff1a<\/p>\n<pre><code class=\"language-java\">\/**\n * Caretaker\uff0c\u8d1f\u8d23\u7ba1\u7406Memento\n *\/\npublic class Caretaker {\n\n    Memento mMemento; \/\/\u5907\u5fd8\u5f55\n\n    \/**\n     * \u5b58\u6863\n     *\/\n    public void archive(Memento memento){\n        this.mMemento = memento;\n    }\n\n    \/**\n     * \u83b7\u53d6\u5b58\u6863\n     *\/\n    public Memento getMemento(){\n        return mMemento;\n    }\n}<\/code><\/pre>\n<p>\u5ba2\u6237\u7aef\u4f7f\u7528\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"language-java\">public class Client {\n    public static void main(String[] args) {\n        \/\/\u6784\u5efa\u6e38\u620f\u5bf9\u8c61\n        CallOfDuty game = new CallOfDuty();\n        \/\/1.\u6253\u6e38\u620f\n        game.play();\n\n        Caretaker caretaker = new Caretaker();\n        \/\/2.\u6e38\u620f\u5b58\u6863\n        caretaker.archive(game.createMemento());\n        \/\/3.\u9000\u51fa\u6e38\u620f\n        game.quit();\n        \/\/4.\u6062\u590d\u6e38\u620f\n        CallOfDuty newGame = new CallOfDuty();\n        newGame.restore(caretaker.getMemento());\n\n        \/\/5.\u518d\u6b21\u6253\u6e38\u620f(\u4e0d\u5b58\u6863)\n        game.play();\n        \/\/6.\u6062\u590d\u4e4b\u524d\u5b58\u6863\n        newGame.restore(caretaker.getMemento());\n    }\n}<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre><code>\u6253\u6e38\u620f\uff1a\u7b2c1\u5173\u594b\u6218\u6740\u654c\u4e2d\n\u8fdb\u5ea6\u5347\u7ea7\u4e86\n\u5230\u8fbe\u7b2c2\u5173\n--------------\n\u9000\u51fa\u524d\u7684\u6e38\u620f\u5c5e\u6027\uff1aCallOfDuty [mCheckpoint=2,mLiftValue=90,mWeapon=\u6c99\u6f20\u4e4b\u9e70]\n\u9000\u51fa\u6e38\u620f\n--------------\n\u6062\u590d\u540e\u7684\u6e38\u620f\u5c5e\u6027\uff1aCallOfDuty [mCheckpoint=2,mLiftValue=90,mWeapon=\u6c99\u6f20\u4e4b\u9e70]\n\u6253\u6e38\u620f\uff1a\u7b2c2\u5173\u594b\u6218\u6740\u654c\u4e2d\n\u8fdb\u5ea6\u5347\u7ea7\u4e86\n\u5230\u8fbe\u7b2c3\u5173\n\u6062\u590d\u540e\u7684\u6e38\u620f\u5c5e\u6027\uff1aCallOfDuty [mCheckpoint=2,mLiftValue=90,mWeapon=\u6c99\u6f20\u4e4b\u9e70]<\/code><\/pre>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u5404\u4e2a\u89d2\u8272\u804c\u8d23\u6e05\u6670\u3001\u5355\u4e00\uff0c\u4ee3\u7801\u4e5f\u6bd4\u8f83\u7b80\u5355\uff0c\u5373\u5bf9\u5916\u5c4f\u853d\u4e86\u5bf9CallOfDuty\u89d2\u8272\u7684\u76f4\u63a5\u8bbf\u95ee\uff0c\u5728\u6ee1\u8db3\u4e86\u5bf9\u8c61\u72b6\u6001\u5b58\u53d6\u529f\u80fd\u7684\u540c\u65f6\u4e5f\u4f7f\u5f97\u8be5\u6a21\u5757\u7684\u7ed3\u6784\u4fdd\u6301\u6e05\u6670\u3001\u6574\u6d01\u3002<\/p>\n<h2>Android\u6e90\u7801\u4e2d\u7684\u5907\u5fd8\u5f55\u6a21\u5f0f<\/h2>\n<ul>\n<li><code>onSaveInstanceState<\/code>\u548c<code>onRestoreInstanceState<\/code><\/li>\n<\/ul>\n<p>\u5f53Activity\u4e0d\u662f\u6b63\u5e38\u65b9\u5f0f\u9000\u51fa\uff0c\u4e14Activity\u5728\u968f\u540e\u7684\u65f6\u95f4\u5185\u88ab\u7cfb\u7edf\u6740\u6b7b\u4e4b\u524d\u4f1a\u8c03\u7528\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u8ba9\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u6709\u673a\u4f1a\u5b58\u50a8Activity\u76f8\u5173\u4fe1\u606f\uff0c\u4e14\u5728\u4e0b\u6b21\u8fd4\u56deActivity\u65f6\u6062\u590d\u8fd9\u4e9b\u6570\u636e\u3002\u901a\u8fc7\u8fd9\u4e24\u4e2a\u51fd\u6570\u3002\u5f00\u53d1\u4eba\u5458\u80fd\u591f\u5728\u67d0\u4e9b\u7279\u6b8a\u573a\u666f\u4e0b\u50a8\u5b58\u4e0e\u754c\u9762\u76f8\u5173\u7684\u4fe1\u606f\uff0c\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<ul>\n<li>\u4f18\u70b9<\/li>\n<\/ul>\n<p>\uff081\uff09\u7ed9\u7528\u6237\u63d0\u4f9b\u4e86\u4e00\u79cd\u53ef\u4ee5\u6062\u590d\u72b6\u6001\u7684\u673a\u5236\uff0c\u53ef\u4ee5\u4f7f\u7528\u6237\u80fd\u591f\u6bd4\u8f83\u65b9\u4fbf\u5730\u56de\u5230\u67d0\u4e2a\u5386\u53f2\u72b6\u6001\u3002<br \/>\n\uff082\uff09\u5b9e\u73b0\u4e86\u4fe1\u606f\u7684\u5c01\u88c5\uff0c\u4f7f\u7528\u6237\u4e0d\u9700\u8981\u5173\u5fc3\u72b6\u6001\u7684\u4fdd\u5b58\u7ec6\u8282\u3002<\/p>\n<ul>\n<li>\u7f3a\u70b9<\/li>\n<\/ul>\n<p>\u6d88\u8017\u8d44\u6e90\uff0c\u5982\u679c\u7c7b\u7684\u6210\u5458\u53d8\u91cf\u8fc7\u591a\uff0c\u52bf\u5fc5\u4f1a\u5360\u7528\u6bd4\u8f83\u5927\u7684\u8d44\u6e90\uff0c\u800c\u4e14\u6bcf\u4e00\u6b21\u4fdd\u5b58\u90fd\u4f1a\u6d88\u8017\u4e00\u5b9a\u7684\u5185\u5b58\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5907\u5fd8\u5f55\u6a21\u5f0f\u662f\u4e00\u79cd\u884c\u4e3a\u6a21\u5f0f\uff0c\u8be5\u6a21\u5f0f\u7528\u4e8e\u4fdd\u5b58\u5bf9\u8c61\u5f53\u524d\u7684\u72b6\u6001\uff0c\u5e76\u4e14\u5728\u4e4b\u540e\u53ef\u4ee5\u518d\u6b21\u6062\u590d\u5230\u6b64\u72b6\u6001\uff0c\u6709\u70b9\u50cf\u662f\u6211\u4eec\u5e73\u5e38\u8bf4\u7684\u201d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[303],"tags":[],"class_list":["post-1122","post","type-post","status-publish","format-standard","hentry","category-design-pattern"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1122","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1122"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1122\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}