{"id":89,"date":"2015-03-30T11:46:44","date_gmt":"2015-03-30T03:46:44","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=89"},"modified":"2017-07-31T14:51:08","modified_gmt":"2017-07-31T06:51:08","slug":"java%e5%a4%9a%e6%80%81%e5%af%b9%e8%b1%a1%e7%9a%84%e7%b1%bb%e5%9e%8b%e8%bd%ac%e6%8d%a2","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=89","title":{"rendered":"Java\u591a\u6001\u5bf9\u8c61\u7684\u7c7b\u578b\u8f6c\u6362"},"content":{"rendered":"

\u5bf9\u8c61\u7c7b\u578b\u8f6c\u6362<\/h2>\n

\u8fd9\u91cc\u6240\u8bf4\u7684\u5bf9\u8c61\u7c7b\u578b\u8f6c\u6362\uff0c\u662f\u6307\u5b58\u5728\u7ee7\u627f\u5173\u7cfb\u7684\u5bf9\u8c61\uff0c\u4e0d\u662f\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u5f53\u5bf9\u4e0d\u5b58\u5728\u7ee7\u627f\u5173\u7cfb\u7684\u5bf9\u8c61\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u65f6\uff0cjava \u8fd0\u884c\u65f6\u5c06\u629b\u51fajava.lang.ClassCastException \u5f02\u5e38\u3002<\/p>\n

\u5728\u7ee7\u627f\u94fe\u4e2d\uff0c\u6211\u4eec\u5c06\u5b50\u7c7b\u5411\u7236\u7c7b\u8f6c\u6362\u79f0\u4e3a\u201c\u5411\u4e0a\u8f6c\u578b\u201d\uff0c\u5c06\u7236\u7c7b\u5411\u5b50\u7c7b\u8f6c\u6362\u79f0\u4e3a\u201c\u5411\u4e0b\u8f6c\u578b\u201d\u3002<\/p>\n

\u5f88\u591a\u65f6\u5019\uff0c\u6211\u4eec\u4f1a\u5c06\u53d8\u91cf\u5b9a\u4e49\u4e3a\u7236\u7c7b\u7684\u7c7b\u578b\uff0c\u5374\u5f15\u7528\u5b50\u7c7b\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u5c31\u662f\u5411\u4e0a\u8f6c\u578b\u3002\u7a0b\u5e8f\u8fd0\u884c\u65f6\u901a\u8fc7\u52a8\u6001\u7ed1\u5b9a\u6765\u5b9e\u73b0\u5bf9\u5b50\u7c7b\u65b9\u6cd5\u7684\u8c03\u7528\uff0c\u4e5f\u5c31\u662f\u591a\u6001\u6027\u3002
\n\u7136\u800c\u6709\u4e9b\u65f6\u5019\u4e3a\u4e86\u5b8c\u6210\u67d0\u4e9b\u7236\u7c7b\u6ca1\u6709\u7684\u529f\u80fd\uff0c\u6211\u4eec\u9700\u8981\u5c06\u5411\u4e0a\u8f6c\u578b\u540e\u7684\u5b50\u7c7b\u5bf9\u8c61\u518d\u8f6c\u6210\u5b50\u7c7b\uff0c\u8c03\u7528\u5b50\u7c7b\u7684\u65b9\u6cd5\uff0c\u8fd9\u5c31\u662f\u5411\u4e0b\u8f6c\u578b\u3002<\/p>\n

\u4f8b\u5b50\uff1a<\/p>\n

[java]class People{
\n\u00a0\u00a0\u00a0 void say(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u5927\u5bb6\u597d\uff0c\u6211\u662f\u826f\u6c11");
\n\u00a0\u00a0\u00a0 }
\n}
\nclass Teacher extends People{
\n\u00a0\u00a0\u00a0 void say(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e00\u540d\u8001\u5e08");
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0 void lecturing(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u6211\u662f\u4e00\u540d\u8001\u5e08,\u6211\u7684\u5de5\u4f5c\u662f\u8bb2\u8bfe");
\n\u00a0\u00a0 }
\n}
\npublic class Demo {
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 People obj = new Teacher(); \/\/\u5411\u4e0a\u8f6c\u578b
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Teacher tbj = (Teacher)obj; \/\/\u5411\u4e0b\u8f6c\u578b
\n\u00a0\u00a0\u00a0\u00a0}
\n}[\/java]<\/p>\n

\u6ce8\u610f\uff1a\u4e0d\u80fd\u76f4\u63a5\u5c06\u7236\u7c7b\u7684\u5bf9\u8c61\u5f3a\u5236\u8f6c\u6362\u4e3a\u5b50\u7c7b\u7c7b\u578b\uff0c\u53ea\u80fd\u5c06\u5411\u4e0a\u8f6c\u578b\u540e\u7684\u5b50\u7c7b\u5bf9\u8c61\u518d\u6b21\u8f6c\u6362\u4e3a\u5b50\u7c7b\u7c7b\u578b\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5b50\u7c7b\u5bf9\u8c61\u5fc5\u987b\u5411\u4e0a\u8f6c\u578b\u540e\uff0c\u624d\u80fd\u518d\u5411\u4e0b\u8f6c\u578b\u3002\u8bf7\u770b\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n

[java]public class Demo {
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 People obj = new People ();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Teacher tbj = (Teacher)obj; \/\/\u62a5\u9519
\n\u00a0\u00a0\u00a0\u00a0}
\n}[\/java]<\/p>\n

\u603b\u7ed3
\n\u6307\u5411\u5b50\u7c7b\u7684\u7236\u7c7b\u5f15\u7528\u7531\u4e8e\u5411\u4e0a\u8f6c\u578b\u4e86\uff0c\u5b83\u53ea\u80fd\u8bbf\u95ee\u7236\u7c7b\u4e2d\u62e5\u6709\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\uff0c\u800c\u5bf9\u4e8e\u5b50\u7c7b\u4e2d\u5b58\u5728\u800c\u7236\u7c7b\u4e2d\u4e0d\u5b58\u5728\u7684\u65b9\u6cd5\uff0c\u8be5\u5f15\u7528\u662f\u4e0d\u80fd\u4f7f\u7528\u7684\uff0c\u5c3d\u7ba1\u662f\u91cd\u8f7d\u8be5\u65b9\u6cd5\u3002\u82e5\u5b50\u7c7b\u91cd\u5199\u4e86\u7236\u7c7b\u4e2d\u7684\u67d0\u4e9b\u65b9\u6cd5\uff0c\u5728\u8c03\u7528\u8be5\u4e9b\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u5fc5\u5b9a\u662f\u4f7f\u7528\u5b50\u7c7b\u4e2d\u5b9a\u4e49\u7684\u8fd9\u4e9b\u65b9\u6cd5\uff08\u52a8\u6001\u8fde\u63a5\u3001\u52a8\u6001\u8c03\u7528\uff09\u3002
\n\u4f8b\u5b50\uff1a<\/p>\n

[java]class People{
\n\u00a0\u00a0\u00a0 void say(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u5927\u5bb6\u597d\uff0c\u6211\u662f\u826f\u6c11");
\n\u00a0\u00a0\u00a0 }
\n}
\nclass Teacher extends People{
\n\u00a0\u00a0\u00a0 void say(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e00\u540d\u8001\u5e08");
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 void say(String content){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(content);
\n\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0 void lecturing(){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println("\u6211\u662f\u4e00\u540d\u8001\u5e08,\u6211\u7684\u5de5\u4f5c\u662f\u8bb2\u8bfe");
\n\u00a0\u00a0 }
\n}
\npublic class Demo {
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 People obj = new Teacher(); \/\/\u5411\u4e0a\u8f6c\u578b
\n\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/obj.lecturing(); \/\/\u4e0d\u80fd\u8c03\u7528
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/obj.say("\u6211\u7231\u5927\u5bb6");\/\/\u4e0d\u80fd\u8c03\u7528
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0obj.say(); \/\/\u8c03\u7528\u5b50\u7c7bsay\u65b9\u6cd5
\n\u00a0\u00a0\u00a0\u00a0}
\n}
\n\u00a0[\/java]<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5bf9\u8c61\u7c7b\u578b\u8f6c\u6362 \u8fd9\u91cc\u6240\u8bf4\u7684\u5bf9\u8c61\u7c7b\u578b\u8f6c\u6362\uff0c\u662f\u6307\u5b58\u5728\u7ee7\u627f\u5173\u7cfb\u7684\u5bf9\u8c61\uff0c\u4e0d\u662f\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\u5f53\u5bf9\u4e0d\u5b58\u5728\u7ee7\u627f\u5173\u7cfb\u7684\u5bf9\u8c61\u8fdb\u884c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[32],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/89"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=89"}],"version-history":[{"count":5,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/89\/revisions"}],"predecessor-version":[{"id":2079,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/89\/revisions\/2079"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=89"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=89"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=89"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}