![\"\u5907\u5fd8\u5f55\u6a21\u5f0f\u7684](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250810215416-68991508e27db.jpg\")
<\/p>\n\u5907\u5fd8\u5f55\u6a21\u5f0f（Memento Pattern）\u4fdd\u5b58\u4e00\u4e2a\u5bf9\u8c61\u7684\u67d0\u4e2a\u72b6\u6001，\u4ee5\u4fbf\u5728\u9002\u5f53\u7684\u65f6\u5019\u6062\u590d\u5bf9\u8c61\u3002\u5907\u5fd8\u5f55\u6a21\u5f0f\u5c5e\u4e8e\u884c\u4e3a\u578b\u6a21\u5f0f\u3002<\/p>\n
\u610f\u56fe：\u5728\u4e0d\u7834\u574f\u5c01\u88c5\u6027\u7684\u524d\u63d0\u4e0b，\u6355\u83b7\u4e00\u4e2a\u5bf9\u8c61\u7684\u5185\u90e8\u72b6\u6001，\u5e76\u5728\u8be5\u5bf9\u8c61\u4e4b\u5916\u4fdd\u5b58\u8fd9\u4e2a\u72b6\u6001\u3002<\/p>\n
\u4e3b\u8981\u89e3\u51b3：\u6240\u8c13\u5907\u5fd8\u5f55\u6a21\u5f0f\u5c31\u662f\u5728\u4e0d\u7834\u574f\u5c01\u88c5\u7684\u524d\u63d0\u4e0b，\u6355\u83b7\u4e00\u4e2a\u5bf9\u8c61\u7684\u5185\u90e8\u72b6\u6001，\u5e76\u5728\u8be5\u5bf9\u8c61\u4e4b\u5916\u4fdd\u5b58\u8fd9\u4e2a\u72b6\u6001，\u8fd9\u6837\u53ef\u4ee5\u5728\u4ee5\u540e\u5c06\u5bf9\u8c61\u6062\u590d\u5230\u539f\u5148\u4fdd\u5b58\u7684\u72b6\u6001\u3002<\/p>\n
\u4f55\u65f6\u4f7f\u7528：\u5f88\u591a\u65f6\u5019\u6211\u4eec\u603b\u662f\u9700\u8981\u8bb0\u5f55\u4e00\u4e2a\u5bf9\u8c61\u7684\u5185\u90e8\u72b6\u6001，\u8fd9\u6837\u505a\u7684\u76ee\u7684\u5c31\u662f\u4e3a\u4e86\u5141\u8bb8\u7528\u6237\u53d6\u6d88\u4e0d\u786e\u5b9a\u6216\u8005\u9519\u8bef\u7684\u64cd\u4f5c，\u80fd\u591f\u6062\u590d\u5230\u4ed6\u539f\u5148\u7684\u72b6\u6001，\u4f7f\u5f97\u4ed6\u6709"\u540e\u6094\u836f"\u53ef\u5403\u3002<\/p>\n
\u5982\u4f55\u89e3\u51b3：\u901a\u8fc7\u4e00\u4e2a\u5907\u5fd8\u5f55\u7c7b\u4e13\u95e8\u5b58\u50a8\u5bf9\u8c61\u72b6\u6001\u3002<\/p>\n
\u5173\u952e\u4ee3\u7801：\u5ba2\u6237\u4e0d\u4e0e\u5907\u5fd8\u5f55\u7c7b\u8026\u5408，\u4e0e\u5907\u5fd8\u5f55\u7ba1\u7406\u7c7b\u8026\u5408\u3002<\/p>\n
\u5e94\u7528\u5b9e\u4f8b：\u00a01\u3001\u540e\u6094\u836f\u3002 2\u3001\u6253\u6e38\u620f\u65f6\u7684\u5b58\u6863\u3002 3\u3001Windows \u91cc\u7684 ctrl + z\u3002 4\u3001IE \u4e2d\u7684\u540e\u9000\u3002 5\u3001\u6570\u636e\u5e93\u7684\u4e8b\u52a1\u7ba1\u7406\u3002<\/p>\n
\u4f18\u70b9：\u00a01\u3001\u7ed9\u7528\u6237\u63d0\u4f9b\u4e86\u4e00\u79cd\u53ef\u4ee5\u6062\u590d\u72b6\u6001\u7684\u673a\u5236，\u53ef\u4ee5\u4f7f\u7528\u6237\u80fd\u591f\u6bd4\u8f83\u65b9\u4fbf\u5730\u56de\u5230\u67d0\u4e2a\u5386\u53f2\u7684\u72b6\u6001\u3002 2\u3001\u5b9e\u73b0\u4e86\u4fe1\u606f\u7684\u5c01\u88c5，\u4f7f\u5f97\u7528\u6237\u4e0d\u9700\u8981\u5173\u5fc3\u72b6\u6001\u7684\u4fdd\u5b58\u7ec6\u8282\u3002<\/p>\n
\u7f3a\u70b9：\u6d88\u8017\u8d44\u6e90\u3002\u5982\u679c\u7c7b\u7684\u6210\u5458\u53d8\u91cf\u8fc7\u591a，\u52bf\u5fc5\u4f1a\u5360\u7528\u6bd4\u8f83\u5927\u7684\u8d44\u6e90，\u800c\u4e14\u6bcf\u4e00\u6b21\u4fdd\u5b58\u90fd\u4f1a\u6d88\u8017\u4e00\u5b9a\u7684\u5185\u5b58\u3002<\/p>\n
\u4f7f\u7528\u573a\u666f：\u00a01\u3001\u9700\u8981\u4fdd\u5b58\/\u6062\u590d\u6570\u636e\u7684\u76f8\u5173\u72b6\u6001\u573a\u666f\u3002 2\u3001\u63d0\u4f9b\u4e00\u4e2a\u53ef\u56de\u6eda\u7684\u64cd\u4f5c\u3002<\/p>\n
\u6ce8\u610f\u4e8b\u9879：\u00a01\u3001\u4e3a\u4e86\u7b26\u5408\u8fea\u7c73\u7279\u539f\u5219，\u8fd8\u8981\u589e\u52a0\u4e00\u4e2a\u7ba1\u7406\u5907\u5fd8\u5f55\u7684\u7c7b\u3002 2\u3001\u4e3a\u4e86\u8282\u7ea6\u5185\u5b58，\u53ef\u4f7f\u7528\u539f\u578b\u6a21\u5f0f+\u5907\u5fd8\u5f55\u6a21\u5f0f\u3002<\/p>\n
\u5907\u5fd8\u5f55\u6a21\u5f0f\u4f7f\u7528\u4e09\u4e2a\u7c7b\u00a0Memento\u3001Originator\u00a0\u548c\u00a0CareTaker\u3002Memento \u5305\u542b\u4e86\u8981\u88ab\u6062\u590d\u7684\u5bf9\u8c61\u7684\u72b6\u6001\u3002Originator \u521b\u5efa\u5e76\u5728 Memento \u5bf9\u8c61\u4e2d\u5b58\u50a8\u72b6\u6001\u3002Caretaker \u5bf9\u8c61\u8d1f\u8d23\u4ece Memento \u4e2d\u6062\u590d\u5bf9\u8c61\u7684\u72b6\u6001\u3002<\/p>\n
MementoPatternDemo，\u6211\u4eec\u7684\u6f14\u793a\u7c7b\u4f7f\u7528\u00a0CareTaker\u00a0\u548c\u00a0Originator\u00a0\u5bf9\u8c61\u6765\u663e\u793a\u5bf9\u8c61\u7684\u72b6\u6001\u6062\u590d\u3002<\/p>\n<\/p>\n
<\/p>\n
\u521b\u5efa Memento \u7c7b\u3002<\/p>\n
public class Memento {
\n private String state;<\/p>\n
public Memento(String state){
\n this.state = state;
\n }<\/p>\n
public String getState(){
\n return state;
\n }
\n}<\/p>\n
\u521b\u5efa Originator \u7c7b\u3002<\/p>\n
public class Originator {
\n private String state;<\/p>\n
public void setState(String state){
\n this.state = state;
\n }<\/p>\n
public String getState(){
\n return state;
\n }<\/p>\n
public Memento saveStateToMemento(){
\n return new Memento(state);
\n }<\/p>\n
public void getStateFromMemento(Memento Memento){
\n state = Memento.getState();
\n }
\n}<\/p>\n
\u521b\u5efa CareTaker \u7c7b\u3002<\/p>\n
import java.util.ArrayList;
\nimport java.util.List;<\/p>\n
public class CareTaker {
\n private List<Memento> mementoList = new ArrayList<Memento>();<\/p>\n
public void add(Memento state){
\n mementoList.add(state);
\n }<\/p>\n
public Memento get(int index){
\n return mementoList.get(index);
\n }
\n}<\/p>\n
\u4f7f\u7528\u00a0CareTaker\u00a0\u548c\u00a0Originator\u00a0\u5bf9\u8c61\u3002<\/p>\n
public class MementoPatternDemo {
\n public static void main(String[] args) {
\n Originator originator = new Originator();
\n CareTaker careTaker = new CareTaker();
\n originator.setState("State #1");
\n originator.setState("State #2");
\n careTaker.add(originator.saveStateToMemento());
\n originator.setState("State #3");
\n careTaker.add(originator.saveStateToMemento());
\n originator.setState("State #4");<\/p>\n
System.out.println("Current State: " + originator.getState());
\n originator.getStateFromMemento(careTaker.get(0));
\n System.out.println("First saved State: " + originator.getState());
\n originator.getStateFromMemento(careTaker.get(1));
\n System.out.println("Second saved State: " + originator.getState());
\n }
\n}<\/p>\n
\u9a8c\u8bc1\u8f93\u51fa\u3002<\/p>\n
Current State: State #4
\nFirst saved State: State #2
\nSecond saved State: State #3<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb2\u6b21\u3002\u7b2c\u4e8c\u5341\u8282 \u5907\u5fd8\u5f55\u6a21\u5f0f<\/p>\n","protected":false},"author":2,"featured_media":51709,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[5128,2874],"topic":[],"class_list":["post-51710","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-5128","tag-2874"],"yoast_head":"\n