{"id":87,"date":"2015-03-30T11:45:51","date_gmt":"2015-03-30T03:45:51","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=87"},"modified":"2017-07-31T15:02:18","modified_gmt":"2017-07-31T07:02:18","slug":"java-instanceof-%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=87","title":{"rendered":"Java instanceof \u8fd0\u7b97\u7b26"},"content":{"rendered":"

instanceof \u64cd\u4f5c\u7b26<\/h2>\n

\u591a\u6001\u6027\u5e26\u6765\u4e86\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u6240\u5b9e\u9645\u5f15\u7528\u7684\u5bf9\u8c61\u7684\u7c7b\u578b \u3002Java \u4f7f\u7528 instanceof \u64cd\u4f5c\u7b26\u3002<\/p>\n

instanceof \u8fd0\u7b97\u7b26\u7528\u6765\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u6240\u5f15\u7528\u7684\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\uff0c\u6ce8\u610f\u662f\u5b83\u5f15\u7528\u7684\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u4e0d\u662f\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u8bf7\u770b\u4e0b\u9762\u7684\u4ee3\u7801\uff1a<\/p>\n

[java]class People{
\n}
\nclass Teacher extends People{
\n}
\nclass President extends Teacher{
\n}[\/java]<\/p>\n

[java]public class Demo{
\n\u00a0\u00a0\u00a0 public static void main(String[] args) {
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ \u5f15\u7528 People \u7c7b\u7684\u5b9e\u4f8b
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 People obj = new People();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof Object){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u4e00\u4e2a\u5bf9\u8c61");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof People){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u4eba\u7c7b");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof Teacher){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u4e00\u540d\u6559\u5e08");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof President){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u6821\u957f");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("———–"); \/\/ \u5206\u754c\u7ebf
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ \u5f15\u7528 Teacher \u7c7b\u7684\u5b9e\u4f8b
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 obj = new Teacher();
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof Object){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u4e00\u4e2a\u5bf9\u8c61");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof People){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u4eba\u7c7b");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof Teacher){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u4e00\u540d\u6559\u5e08");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if(obj instanceof President){
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println("\u6211\u662f\u6821\u957f");
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
\n\u00a0\u00a0\u00a0 }
\n}<\/p>\n

\u8fd0\u884c\u7ed3\u679c\uff1a
\n\u6211\u662f\u4e00\u4e2a\u5bf9\u8c61
\n\u6211\u662f\u4eba\u7c7b
\n———–
\n\u6211\u662f\u4e00\u4e2a\u5bf9\u8c61
\n\u6211\u662f\u4eba\u7c7b
\n\u6211\u662f\u4e00\u540d\u6559\u5e08[\/java]<\/p>\n

\u53ef\u4ee5\u770b\u51fa\uff0c\u5982\u679c\u53d8\u91cf\u5f15\u7528\u7684\u662f\u5f53\u524d\u7c7b\u6216\u5b83\u7684\u5b50\u7c7b\u7684\u5b9e\u4f8b\uff0cinstanceof \u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

instanceof \u64cd\u4f5c\u7b26 \u591a\u6001\u6027\u5e26\u6765\u4e86\u4e00\u4e2a\u95ee\u9898\uff0c\u5c31\u662f\u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u6240\u5b9e\u9645\u5f15\u7528\u7684\u5bf9\u8c61\u7684\u7c7b\u578b \u3002Java \u4f7f […]<\/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\/87"}],"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=87"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/87\/revisions"}],"predecessor-version":[{"id":2081,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/87\/revisions\/2081"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=87"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=87"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=87"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}