\u89c2\u5bdf\u8005\u6a21\u5f0f\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e00\u5bf9\u591a\u7684\u4f9d\u8d56\u5173\u7cfb\u3002\u8ba9\u4e00\u4e2a\u6216\u591a\u4e2a\u89c2\u5bdf\u8005\u53ef\u4ee5\u76d1\u89c6\u67d0\u4e00\u5bf9\u8c61\uff0c\u5f53\u8be5\u5bf9\u8c61\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u5c31\u53ef\u4ee5\u901a\u77e5\u6240\u6709\u7684\u89c2\u5bdf\u8005\uff0c\u89c2\u5bdf\u8005\u6267\u884c\u54cd\u5e94\u7684\u52a8\u4f5c\u3002<\/p>\n
\u5728java\u4e2d\uff0c\u88ab\u89c2\u5bdf\u8005\u5fc5\u987b\u7ee7\u627fObservable\u7c7b\uff0cObservable\u7c7b\u5e38\u7528\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
public void addObserver(Observer o) \u6dfb\u52a0\u4e00\u4e2a\u89c2\u5bdf\u8005<\/p>\n<\/li>\n<\/ul>\n
<\/p>\n
public void deleteObserver(Observer 0) \u5220\u9664\u4e00\u4e2a\u89c2\u5bdf\u8005<\/p>\n<\/li>\n
protected void setChanged() \u88ab\u89c2\u5bdf\u8005\u8bbe\u7f6e\u81ea\u5df1\u7684\u72b6\u6001\u53d1\u751f\u4e86\u53d8\u5316<\/p>\n<\/li>\n
public void notifyObservers(Object arg) \u901a\u77e5\u6240\u6709\u7684\u89c2\u5bdf\u8005<\/p>\n<\/li>\n<\/ul>\n
\u6bcf\u4e00\u4e2a\u89c2\u5bdf\u8005\u90fd\u8981\u5b9e\u73b0Observer\u63a5\u53e3\uff0cObserver\u63a5\u53e3\u4e2d\u53ea\u6709\u4e00\u4e2aupdate\u65b9\u6cd5\uff0c<\/p>\n
public void update(Observable o, Object arg)<\/pre>\n\u7b2c\u4e00\u4e2a\u53c2\u6570\u8868\u793a\u88ab\u89c2\u5bdf\u8005\u5b9e\u4f8b\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8868\u793a\u4fee\u6539\u7684\u5185\u5bb9\u3002<\/p>\n
\u88ab\u89c2\u5bdf\u8005\u4ee3\u7801\uff1a<\/p>\n
package com.yeetrack.test;\n \nimport java.util.Observable;\n \npublic class Hourse extends Observable\n{\n private int price; \/\/\u81ea\u8eab\u7684\u5c5e\u6027\uff0c\u4ee3\u8868\u623f\u5b50\u4ef7\u683c\n public int getPrice()\n {\n return price;\n }\n \n public void setPrice(int price)\n {\n this.price = price;\n super.setChanged(); \/\/\u8bbe\u7f6e\u81ea\u5df1\u7684\u72b6\u6001\u53d1\u751f\u4e86\u53d8\u5316\n super.notifyObservers(price);\/\/\u901a\u77e5\u88ab\u89c2\u5bdf\u8005price\u53d1\u751f\u4e86\u53d8\u5316\n }\n \/\/\u6784\u9020\u65b9\u6cd5\n public Hourse(int price)\n {\n this.price = price;\n }\n}<\/pre>\n\u89c2\u5bdf\u8005\u4ee3\u7801\uff1a<\/p>\n
package com.yeetrack.test;\n \nimport java.util.Observable;\nimport java.util.Observer;\n \npublic class HoursePriceObserver implements Observer\n{\n private String name; \/\/\u89c2\u5bdf\u8005\u81ea\u5df1\u7684\u540d\u5b57\n public HoursePriceObserver(String name)\n {\n \/\/ TODO Auto-generated constructor stub\n this.name = name;\n }\n \/\/Observer\u4e2d\u7684update\u65b9\u6cd5\uff0c\u5982\u679c\u88ab\u89c2\u5bdf\u8005\u72b6\u6001\u53d1\u751f\u53d8\u5316\uff0c\u5c31\u4f1a\u81ea\u52a8\u8c03\u7528\u6b64\u65b9\u6cd5\n public void update(Observable o, Object arg)\n {\n \/\/ TODO Auto-generated method stub\n System.out.println(this.name+" "+arg);\n \n }\n}<\/pre>\n\u6d4b\u8bd5\u4ee3\u7801\uff1a<\/p>\n
package com.yeetrack.test;\n \npublic class TestObserve\n{\n \/**\n * @param args\n *\/\n public static void main(String[] args)\n {\n \/\/ TODO Auto-generated method stub\n Hourse hourse = new Hourse(10000);\n HoursePriceObserver hpo1 = new HoursePriceObserver("111"); \/\/\u521d\u59cb\u5316\u89c2\u5bdf\u80051\n HoursePriceObserver hpo2 = new HoursePriceObserver("222"); \/\/\u521d\u59cb\u5316\u89c2\u5bdf\u80052\n hourse.addObserver(hpo1); \/\/\u4e3ahourse\u6dfb\u52a0\u4e00\u4e2a\u89c2\u5bdf\u8005\n hourse.addObserver(hpo2);\n hourse.setPrice(40000);\/\/\u6539\u52a8hourse\u7684\u4ef7\u683c\uff0c\u89c2\u5bdf\u8005hpo1\u548chpo2\u4f1a\u81ea\u52a8\u8c03\u7528update\u65b9\u6cd5\u3002\n }\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"\u89c2\u5bdf\u8005\u6a21\u5f0f\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e00\u5bf9\u591a\u7684\u4f9d\u8d56\u5173\u7cfb\u3002\u8ba9\u4e00\u4e2a\u6216\u591a\u4e2a\u89c2\u5bdf\u8005\u53ef\u4ee5\u76d1\u89c6\u67d0\u4e00\u5bf9\u8c61\uff0c\u5f53\u8be5\u5bf9\u8c61\u7684\u72b6\u6001\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u5c31\u53ef\u4ee5\u901a\u77e5\u6240\u6709\u7684\u89c2\u5bdf\u8005\uff0c\u89c2\u5bdf\u8005\u6267\u884c\u54cd\u5e94\u7684\u52a8\u4f5c\u3002 \u5728java\u4e2d\uff0c\u88ab\u89c2\u5bdf\u8005\u5fc5\u987b\u7ee7\u627fObservable\u7c7b...<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[33],"tags":[8,7,5],"class_list":["post-31","post","type-post","status-publish","format-standard","hentry","category-coding","tag-java","tag-7","tag-5"],"views":2381,"_links":{"self":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=31"}],"version-history":[{"count":2,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions"}],"predecessor-version":[{"id":350,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/31\/revisions\/350"}],"wp:attachment":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=31"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=31"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}